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ICSE Class 10 Exam 2020- Top 10 Questions in Biology

Biology is an interesting subject and a student can score easily if he/she pays attention. Biology offers a deep insight to living organisms’ functions and also a way to score more marks through legible diagrams. Therefore, both theory and drawing (with proper labelling) are crucial to this subject.

The ICSE Class 10 Biology paper is for 80 marks and is divided into two sections. Students get two hours to complete the paper and must attempt all questions. The important questions listed below are by our subject matter experts. The goal of jotting these questions is to nudge the students to read the right topics and focus on the chapters that have more scope to be on the question paper. The questions are as follows:

  1. Diagram representing a stage during mitotic/meiotic cell division.
    You may be asked to identify the stage, the chromosome number at the given stage and details about the stages which follow the given stage.
    Study the diagram given below which represents a stage during mitotic cell division and answer the questions that follow:

    (i)   Identify the stage giving suitable reasons.
    (ii) Name the parts numbered 1 and 2.
    (iii) What is the technical term for the division of the nucleus?
    (iv)   Mention the stage that comes before the stage shown in the diagram. Draw a neat and labelled diagram of the stage mentioned.
    (v)  Which is the cell division that results in half the number of chromosomes in daughter cells?

    (i)   Telophase
    (ii) 1 – Daughter chromosome, 2 – Nuclear membrane
    (iii) Karyokinesis is the technical term for the division of a nucleus.
    (iv) Anaphase
    (v)  Meiosis

  2. Diagrams showing the experiments on photosynthesis in green plants. You may be asked to identify and define the process, chemical equation for photosynthesis and the effect of alteration in the factors affecting photosynthesis.

    A potted plant with variegated leaves was taken in order to prove a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours and then placed in bright sunlight for a few hours. Observe the diagram and answer the questions.

    (i)   What aspect of photosynthesis is being tested in the above diagram?
    (ii)  Represent the process of photosynthesis in the form of a balanced equation.
    (iii) Why was the plant kept in the dark before beginning the experiment?
    (iv)  What will be the result of the starch test performed on leaf ‘A’ shown in the diagram? Given an example of a plant with variegated leaves.
    (v)   Draw a neat and labelled diagram of a chloroplast.

  3. Diagram showing the cross section of blood vessels. You may be asked to identify the blood vessels, their functions, type of blood that flows in each of these vessels and the structural differences between the blood vessels.
    The diagrams given below are cross sections of blood vessels: 

    (i) Identify the blood vessels A, B and C.
    (ii) Name the parts labelled 1 to 3.
    (iii) Name the type of blood that flows through A.
    (iv) Mention one structural difference between A and B.
    (v) In which of the above vessels does the exchange of gases actually take place?

  4. Name the following:
    (a)  Physical expression of genes in an individual
    (b) Structural and functional unit of the kidney
    (c)  Statistical study of human population

  5. Choose the correct answer from each of the four options given below:

     iA plant cell may burst when
        a. Turgor pressure equalises wall pressure
        b. Turgor pressure exceeds wall pressure
        c. Wall pressure exceeds turgor pressure
        d. None of the above 

    ii. A plant is kept in a dark cupboard for 48 hours before conducting any experiment on photosynthesis to
        a. Remove starch from the plant
        b. Ensure that starch is not translocated from the leaves
        c. Remove chlorophyll from the leaf of the plant
        d. Remove starch from the experimental leaf

    iiiA reflex arc in man is best described as the movement of stimuli from
         a. Receptor cell, sensory neuron, relaying neuron, effector muscles
         b. Receptor cell, efferent nerve, relaying neuron, muscles of the body
         c. Receptor cell, spinal cord, motor neuron, relaying neuron
         d. Receptor cell, synapse, motor neuron, relaying neuron

  6. State the exact location of the following structures:
    a. Chordae tendineae
    b. Corpus callosum
    c.Organ of Corti

  7. State the main function of the following:
    a. Cerebrospinal fluid
    b. Placenta
    c.Beta cells of the pancreas

  8. Differentiate between the following pairs on the basis of what is mentioned within brackets:
    a. Rod cells and cone cells (pigment)
    b. Phototropic and geotropic movements (stimulus)
    c. Diffusion and osmosis (definition)

  9. Give the biological/technical term for the following:
    a. Complete stoppage of the menstrual cycle in females
    b. Removal of nitrogenous wastes from the body
    c. Squeezing of WBCs through the walls of the capillaries into the tissue

  10. Give scientific reasons for the following statements:
    a. Injury to the medulla oblongata leads to death.
    b. Blood flows in the arteries in spurts and is under pressure.
    c. Carbon monoxide is highly dangerous when inhaled.

Review all the important answers and practice material for the ICSE Class 10 Biology Exam 2020 below:

ICSE Class 10 Biology Exam 2020 - Sample Papers
ICSE Class 10 Biology Exam 2020 - Previous years’ papers
ICSE Class 10 Biology Exam 2020 – Most important questions
ICSE Class 10 Biology Exam 2020 – Text book solutions

Important topics for your reference:

Biology Diagrams Made Easy for CBSE and ICSE Board Exams

Smart Ways to Avoid Mistakes in the ICSE Class 10 Science Exam

10 Powerful tips for ICSE Class 10 Exam preparation - 2020


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