Reproduction In Animals Worksheet

Objective Type Questions

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1. Complete the paragraph by choosing the most appropriate terms from those given in the brackets.
   (testes, uterus, fertilisation, zygote, ovaries, implantation, embryo, foetus)
   In humans, the male reproductive organs called the ……………….. produce sperms while the female reproductive organs called the ……………….. produce eggs. When the sperms come in contact with the egg, one of the sperms fuses with the egg to form the ………………… Such fusion of the egg and the sperm is called ……………….. The zygote divides repeatedly to form a structure called the ………………… This structure gets embedded in the ……………….. for further development.
   
   
2. Classify the given animals as oviparous and viviparous animals.
   
   
   
3. Complete the figure by choosing the appropriate labels given in brackets.
   (adult frog, eggs, early tadpole, froglet, late tadpole)
   
   
   
4. Which of the following indicates sexual reproduction?
   (a)Fragmentation of algae into smaller fragments, each developing into new algae.
   (b)Growth of a potato plant from a piece of potato with eye sown into wet and loamy soil.
   (c)Transfer of pollen grains from one flower to the stigma of another flower of the same kind.
   (d)Formation of a bud in yeast, which develops and separates from the body of the parent yeast.
   
   
5. Animals and plants can reproduce through sexual as well as asexual modes of reproduction. Which of the following is true with respect to both these methods?
   (a)Sexual reproduction requires an interaction between two different animals, while asexual reproduction requires an interaction between animals of the same kind.
   (b)Sexual reproduction requires an interaction between the opposite sexes of animals of the same kind, while in asexual reproduction such an interaction is not required.
   (c)Sexual reproduction requires an interaction between opposite sexes of two different animals, while in asexual reproduction animals of the same kind interact.
   (d)Sexual reproduction requires an interaction between the gametes of two different animals, while in asexual reproduction gametes of the animals of the same kind interact.
   
   
6. A reproductive process is shown below. What is characteristic of this process?
   
   (a)Release of the egg from the ovaries
   (b)Attachment of the egg to the wall of the uterus
   (c)Fusion of the sperm and the ovum
   (d)Transfer of ovum through the oviduct
   
   
7. Given below are few statements about a foetus.
   I.All body parts can be identified properly.
   II.It is covered by a hard shell of protective layers.
   III.It resembles a large ball made of millions of cells.
   Which of these statements are true?
   (a) I and II
   (b) Only I
   (c) Only III
   (d) II and III
   
   
8. Which of these is true about external fertilization and internal fertilization?
   
   
   
9. The picture shows the basic parts of a salmon fish sperm. Which part of the sperm helps it to swim in water and reach the egg?
   
   (a) A
   (b) B
   (c) C
   (d )D
   
   
10. Given below are the steps involved in embryo formation.
    I - The embryo develops body parts.
    II - The zygote divides repeatedly to give rise to a ball of cells.
    III - The cells form groups that develop into different tissues and organs of the body.
    IV - The embryo gets embedded in the wall of the uterus for further development.
    Which of the following gives the correct order of the steps.
    (a)I, II, III, IV
    (b)II, III, IV, I
    (c)III, II, I, IV
    (d)III, I, IV, II
    
    
11. Which example can be used to differentiate between a viviparous and an oviparous animal?
    (a)Hens lay eggs which hatch into chicks, while cats produce kittens.
    (b)Frogs lay soft-shelled eggs, while birds lay hard-shelled eggs.
    (c)Frogs lay unfertilized eggs in water, while hens lay fertilized eggs.
    (d)Dogs give birth to several puppies, while elephants give birth to just one calf.
    
    
12. The pictures show three types of reproduction in animals.
    
    Which of the following statements is true?
    (a)Type 1 reproduction is called binary fission.
    (b)Type 2 reproduction produces two non-identical offspring.
    (c)Type 3 reproduction involves unequal distribution of genetic material.
    (d)Types 1, 2 and 3 methods of reproduction involve single parent only.
     
    Subjective Questions
    
    
13. The given figure shows two different types of gametes produced in humans.
    
    (a)Identify A and B and mention the sex – male or female in which they are found.
    (b)Give two points of differences between A and B.
    (c)What is the role of tail in B?
    
    
14. Rishabh’s science teacher planned to teach the concept of fertilisation in class. She told her students to go through the textbook to get an idea of the concept. At home, while flipping through the science textbook, Rishabh saw two pictures A and B as shown below. He went ahead and read more information about them.
    
    (a)Which processes are shown in figures A and B respectively?
    (b)How are the two processes different from one another?
    (c)Name two organisms which reproduce by the process shown in figure B.
    
     
15. The picture shows two different methods of reproduction in animals.
    
    (a)Which methods are illustrated in figures A and B respectively?
    (b)Are these sexual or asexual methods of reproduction? Explain your answer.
    (c)Give two examples each of organisms which reproduce by methods A and B.
    (d)Which structure is formed in method A which gives rise to new individuals?
    
    
16. Students of Class 8 went on a trip to a nearby lake. While approaching the lake, they saw a frog surrounded by hundreds of eggs, sitting on a rock near the lake. They all got scared and immediately called their teacher. When the teacher saw this sight, she told the students that those were frog eggs. Why do you think the frog must have laid so many eggs?
    
    Case-Based Questions
    
    
17. In animals, males and females have different reproductive organs. These organs produce gametes which fuse to form a zygote. It is the zygote which develops into a new individual. The below image shows the reproductive system in females. Observe the image carefully and answer the questions based in it.
    
    a) A mature egg and a sperm unite to form a zygote. In which part of the female reproductive system does a zygote form?
    (a) P
    (b) Q
    (c) R
    (d) S
    
    b) How many eggs are usually released each month by the ovary of a woman?
    (a) 1
    (b) 2
    (c) 14
    (d) 24
    
    c) In which part of the female reproductive system does an embryo implant?
    (a) P
    (b) Q
    (c) R
    (d) S
    
    d) A single cell is a cell which can perform all basic functions. Which of the following represent single cells?
    (a) Human sperm
    (b) Egg of an ostrich
    (c) White blood cells
    (d) All of these
    
    
18. The young one of a hen that hatches from the egg looks like the adult hen. In contrast, the young one of a frog looks very different from the adult frog. Amphibians like frogs and insects like the butterfly and silkworm undergo several stages before they mature and become adults. Each of these stages vary in appearance and characteristics.
    The picture below shows the life cycle of a moth.
    
    a)Which of the following correctly lists the different stages in the life cycle of a moth?
    
    (a) PupaLarvaEggAdult
    (b) LarvaEggAdultPupa
    (c) EggLarvaPupaAdult
    (d) AdultPupaLarvaEgg
    
    b)The transformation of the larva into an adult through drastic changes is called ……………………..
    
    c)Which of the following has a life cycle similar to a moth?
    (a) Silkworm and hen
    (b) Silkworm and frog
    (c) Frog and hen
    (d) Hen and horse
    
    d)Which of the following can be concluded from the given picture?
    I - Moth is an oviparous animal.
    II - A moth looks different in each stage of its life cycle.
    III - There are two different stages in the life cycle of a moth.
    (a) I and II
    (b) II and III
    (c) I and III
    (d) I, II and III
    
    Assertion-Reasoning Questions
    
    Below questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below: 
    
    
    
19. Assertion (A): In markets, eggs of birds are available, but eggs of cow are never available.
    Reason (R): Birds are oviparous while cow is a viviparous animal.
    
    
20. Assertion (A): Though Dolly was given birth by the Scottish blackface ewe, it was found to be identical to the Finn Dorsett sheep.
    Reason (R): The nucleus of Finn Dorsett sheep was inserted into the egg of the Scottish blackface ewe whose nucleus had been removed.

Objective Type Questions

1. Complete the paragraph by choosing the most appropriate terms from those given in the brackets.
   (testes, uterus, fertilisation, zygote, ovaries, implantation, embryo, foetus)
   In humans, the male reproductive organs called the ……………….. produce sperms while the female reproductive organs called the ……………….. produce eggs. When the sperms come in contact with the egg, one of the sperms fuses with the egg to form the ………………… Such fusion of the egg and the sperm is called ……………….. The zygote divides repeatedly to form a structure called the ………………… This structure gets embedded in the ……………….. for further development.
   Solution:
    In humans, the male reproductive organs called the testes produce sperms while the female reproductive organs called the ovaries produce eggs. When the sperms come in contact with the egg, one of the sperms fuses with the egg to form the zygote. Such fusion of the egg and the sperm is called fertilisation. The zygote divides repeatedly to form a structure called the embryo. This structure gets embedded in the uterus for further development.
   
   
2. Classify the given animals as oviparous and viviparous animals.
   
   Solution:
   Oviparous Animals – Ostrich, Crocodile, Hen
   Viviparous animals – Dog, Cow
   
   
3. Complete the figure by choosing the appropriate labels given in brackets.
   (adult frog, eggs, early tadpole, froglet, late tadpole)
   
   Solution:
   1. Eggs
   2. Early tadpole|
   3. Late tadpole
   4. Froglet
   5. Adult frog
   
   
4. Which of the following indicates sexual reproduction?
   (a)Fragmentation of algae into smaller fragments, each developing into new algae.
   (b)Growth of a potato plant from a piece of potato with eye sown into wet and loamy soil.
   (c)Transfer of pollen grains from one flower to the stigma of another flower of the same kind.
   (d)Formation of a bud in yeast, which develops and separates from the body of the parent yeast.
   Correct Option: (c) Transfer of pollen grains from one flower to the stigma of another flower of the same kind.
   Solution: Fragmentation as seen in algae, vegetative propagation in potato and budding as observed in yeast are modes of asexual reproduction. Transfer of pollen grains or pollination occurs in sexual reproduction in flowers.
   
   
5. Animals and plants can reproduce through sexual as well as asexual modes of reproduction. Which of the following is true with respect to both these methods?
   (a)Sexual reproduction requires an interaction between two different animals, while asexual reproduction requires an interaction between animals of the same kind.
   (b)Sexual reproduction requires an interaction between the opposite sexes of animals of the same kind, while in asexual reproduction such an interaction is not required.
   (c)Sexual reproduction requires an interaction between opposite sexes of two different animals, while in asexual reproduction animals of the same kind interact.
   (d)Sexual reproduction requires an interaction between the gametes of two different animals, while in asexual reproduction gametes of the animals of the same kind interact.
   Correct Option: (b) Sexual reproduction requires an interaction between the opposite sexes of animals of the same kind, while in asexual reproduction such an interaction is not required.
   Solution: Sexual reproduction involves two parents of opposite sexes of the same kind of animals. They produce gametes which combine to form the zygote. In asexual reproduction, offspring are produced by a single parent. There is no fusion of gametes involved.
   
   
6. A reproductive process is shown below. What is characteristic of this process?
   
   (a)Release of the egg from the ovaries
   (b)Attachment of the egg to the wall of the uterus
   (c)Fusion of the sperm and the ovum|
   (d)Transfer of ovum through the oviduct
   Correct Option: (c) Fusion of the sperm and the ovum
   Solution: The process of fusion of the sperm and the egg is called fertilisation.  
   Given below are few statements about a foetus.
   I.All body parts can be identified properly.
   II.It is covered by a hard shell of protective layers.|
   III.It resembles a large ball made of millions of cells.
   
   
7. Which of these statements are true?
   (a) I and II
   (b) Only I
   (c) Only III
   (d) II and III
   Correct Option: (b) Only I
   Solution: The zygote divides repeatedly to form the embryo. The embryo continues to develop in the uterus. It gradually develops body parts such as hands, legs, head, eyes, and ears. This stage of the embryo in which all the body parts can be identified is called a foetus.
   
   
8. Which of these is true about external fertilization and internal fertilization?
   
   Correct Option: (a)
   
   Solution: In animals which undergo external fertilisation, development of the embryo takes place outside the female body. Development of eggshell is seen only in few animals such as hens which undergo internal fertilisation. External fertilisation also takes places in vertebrates such as frogs and fishes.
   
   
9. The picture shows the basic parts of a salmon fish sperm. Which part of the sperm helps it to swim in water and reach the egg?
   
   (a) A
   (b) B
   (c) C
   (d ) D
   Correct Option:(d) D
   Solution: Each sperm consists of a head (A), middle piece (B) and a tail (D).
   The tail provides motility to the sperm. It enables whip like movement and pushes the sperm forward so that it can swim towards the egg and fuse with it. 
   
   
10. Given below are the steps involved in embryo formation.
    I - The embryo develops body parts.
    II - The zygote divides repeatedly to give rise to a ball of cells.
    III - The cells form groups that develop into different tissues and organs of the body.
    IV - The embryo gets embedded in the wall of the uterus for further development.
    Which of the following gives the correct order of the steps.
    (a)I, II, III, IV
    (b)II, III, IV, I
    (c)III, II, I, IV
    (d)III, I, IV, II
    Correct Option: (b) II, III, IV, I
    Solution: The zygote divides repeatedly to give rise to a ball of cells. The cells then form groups that develop into different tissues and organs of the body. This developing structure is termed an embryo. The embryo gets embedded in the wall of the uterus for further development. The embryo develops body parts. The stage of the embryo in which all the body parts can be identified is called a foetus.
    
    
11. Which example can be used to differentiate between a viviparous and an oviparous animal?
    (a)Hens lay eggs which hatch into chicks, while cats produce kittens.
    (b)Frogs lay soft-shelled eggs, while birds lay hard-shelled eggs.
    (c)Frogs lay unfertilized eggs in water, while hens lay fertilized eggs.
    (d)Dogs give birth to several puppies, while elephants give birth to just one calf.
    Correct Option: (a) Hens lay eggs which hatch into chicks, while cats produce kittens.
    Solution: Animals such as hens which lay eggs are called oviparous animals while animals such as elephants and dogs which give birth to young ones are called viviparous animals.
    
    
12. The pictures show three types of reproduction in animals.
    
    Which of the following statements is true?
    (a)Type 1 reproduction is called binary fission.
    (b)Type 2 reproduction produces two non-identical offspring.
    (c)Type 3 reproduction involves unequal distribution of genetic material.
    (d)Types 1, 2 and 3 methods of reproduction involve single parent only.
    Correct Option: (d) Types 1, 2 and 3 methods of reproduction involve single parent only.
    Solution: Budding (Type 1), binary fission (Type 2) and fragmentation (Type 3) are asexual methods of reproduction which involve a single parent. In asexual reproduction, there is equal distribution of genetic material and the offspring formed are identical to their parents.
    
    Subjective Questions
13. The given figure shows two different types of gametes produced in humans.
    
    (a)Identify A and B and mention the sex – male or female in which they are found.
    (b)Give two points of differences between A and B.
    (c)What is the role of tail in B?
    Solution:
    (a)A – Human sperm. It is found in males.
    B – Human ovum/egg. It is found in females. |
    (b)Differences between human sperm and human egg:
    
    (c)The tail provides motility to the sperm. It enables whip like movement and pushes the sperm forward so that it can swim towards the egg and fuse with it. 
    
    
14. Rishabh’s science teacher planned to teach the concept of fertilisation in class. She told her students to go through the textbook to get an idea of the concept. At home, while flipping through the science textbook, Rishabh saw two pictures A and B as shown below. He went ahead and read more information about them.
    
    (a)Which processes are shown in figures A and B respectively?
    (b)How are the two processes different from one another?
    (c)Name two organisms which reproduce by the process shown in figure B.
    Solution:
    (a)A – Internal fertilisation; B – External fertilisation
    (b)Differences between internal and external fertilisation:
    
    (c)Fishes, frog, and starfish reproduce by external fertilisation.
    
    
15. The picture shows two different methods of reproduction in animals.
    
    (a)Which methods are illustrated in figures A and B respectively?
    (b)Are these sexual or asexual methods of reproduction? Explain your answer.
    (c)Give two examples each of organisms which reproduce by methods A and B.
    (d)Which structure is formed in method A which gives rise to new individuals?
    Solution:
    (a)A – Budding in Hydra
    B – Binary fission in Amoeba
    (b)Both budding and binary fission are asexual methods of reproduction because a single parent divides to form new individuals. There is no formation or fusion of gametes involved in both these methods.
    (c)Organisms which reproduce through
    •Budding (A) – Hydra, Yeast
    •Binary fission (B) – Amoeba, Paramoecium
    (d)The body of Hydra develops buds which give rise to new individuals.
    
    
16. Students of Class 8 went on a trip to a nearby lake. While approaching the lake, they saw a frog surrounded by hundreds of eggs, sitting on a rock near the lake. They all got scared and immediately called their teacher. When the teacher saw this sight, she told the students that those were frog eggs. Why do you think the frog must have laid so many eggs?
    Solution:
    Frogs undergo external fertilisation where the fusion of the sperm and the egg occurs outside the body of the female. In the external environment, the eggs are exposed to water movement, wind, and rainfall. Also, there are other animals in the pond which may feed on eggs. Thus, production of large number of eggs is necessary to ensure that at least a few eggs get fertilised. Hence, animals such as frogs and fishes which undergo external fertilisation, lay hundreds of eggs.
    
    Case-Based Questions
17. In animals, males and females have different reproductive organs. These organs produce gametes which fuse to form a zygote. It is the zygote which develops into a new individual. The below image shows the reproductive system in females. Observe the image carefully and answer the questions based in it.
    
    a) A mature egg and a sperm unite to form a zygote. In which part of the female reproductive system does a zygote form?
    (a) P
    (b) Q
    (c) R
    (d) S
    Correct option: (a) P
    Solution: The male gamete or the sperm and the female gamete or the egg fuse together to form the zygote. This process takes place in the oviduct or the fallopian tube.
    
    b) How many eggs are usually released each month by the ovary of a woman?
    (a) 1
    (b) 2
    (c) 14
    (d) 24
    Correct option: (a) 1
    Solution: In human beings, a single matured egg is released into the oviduct by one of the ovaries every month.
    
    c) In which part of the female reproductive system does an embryo implant?
    (a) P
    (b) Q
    (c) R
    (d) S
    Correct option: (b) Q
    Solution: The embryo gets implanted in the lining of the uterus. 
    
    d) A single cell is a cell which can perform all basic functions. Which of the following represent single cells?
    (a) Human sperm
    (b) Egg of an ostrich
    (c) White blood cells
    (d) All of these
    Correct option: (d) All of these
    Solution: Human sperm, egg of an ostrich, hen, or humans, white blood cells are all examples of single cells as each of these cells can independently carry out the basic functions. 
    The young one of a hen that hatches from the egg looks like the adult hen. In contrast, the young one of a frog looks very different from the adult frog. Amphibians like frogs and insects like the butterfly and silkworm undergo several stages before they mature and become adults. Each of these stages vary in appearance and characteristics.
    
    
18. The picture below shows the life cycle of a moth.
    
    a)Which of the following correctly lists the different stages in the life cycle of a moth?
    
    (a) PupaLarvaEggAdult
    (b) LarvaEggAdultPupa
    (c) EggLarvaPupaAdult
    (d) AdultPupaLarvaEgg
    a) Correct Option: (c)
    
    Solution: The life cycle of a moth begins with the egg followed by the larva or caterpillar stage. The caterpillar then enters the pupa or cocoon stage. The cocoon hatches into an adult moth.
    
    b)The transformation of the larva into an adult through drastic changes is called ……………………..
    Solution: 
    b) The transformation of the larva into an adult through drastic changes is called metamorphosis.
    
    c) Which of the following has a life cycle similar to a moth?
    (a) Silkworm and hen
    (b) Silkworm and frog
    (c) Frog and hen
    (d) Hen and horse
    Correct option: (b) Silkworm and frog
    Solution: Amphibians like frogs and insects like the butterfly and silkworm undergo metamorphosis.
    
    d)Which of the following can be concluded from the given picture?
    I - Moth is an oviparous animal.
    II - A moth looks different in each stage of its life cycle.
    III - There are two different stages in the life cycle of a moth.
    (a) I and II
    (b) II and III
    (c) I and III
    (d) I, II and III
    Correct option: (a) I and II
    Solution: Since eggs form the first stage in the life cycle of a moth, we can say that moth is an oviparous animal. A moth undergoes metamorphosis in which it looks different in each stage of its life cycle. There are four and not two different stages in the life cycle of a moth.
    
    Assertion-Reasoning Questions
    
    Below questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below: 
    
    
19. Assertion (A): In markets, eggs of birds are available, but eggs of cow are never available.
    Reason (R): Birds are oviparous while cow is a viviparous animal.
    Correct Option: (a) Both A and R are true and R is the correct explanation of A.
    Solution: Cows are viviparous. They do not lay eggs but give birth to calves. Hence, eggs of a cow are not available in the market. Birds lay eggs, they are oviparous and hence, their eggs are available in the market. So, both assertion and reason are true and the reason correctly explains the given assertion.
    
    
20. Assertion (A): Though Dolly was given birth by the Scottish blackface ewe, it was found to be identical to the Finn Dorsett sheep.
    Reason (R): The nucleus of Finn Dorsett sheep was inserted into the egg of the Scottish blackface ewe whose nucleus had been removed.
    Correct Option: (a) Both A and R are true and R is the correct explanation of A.
    Solution: While cloning Dolly, the nucleus of the mammary gland cell from the Finn Dorsett sheep was inserted into the egg of the Scottish blackface ewe whose nucleus had been removed. Though Dolly was given birth by the Scottish blackface ewe, it was found to be identical to the Finn Dorsett sheep from which the nucleus was taken. Since thenucleus from the egg of the Scottish blackface ewe was removed, Dolly did not show any character of the Scottish blackface ewe.