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Prefertilisation Structures And Events Free Doubts and Solutions

CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

EXPLAIN  WITH  THE  HELP  OF  DIAGRAM  THE  DEVELOPMENT  OF  A  MATURE  EMBRYO  SAC  FROM  A  MEGASPORE  MOTHER  CELL  IN ANGIOSPERM 

Asked by pardeepkumar2281 3rd October 2018, 7:42 PM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

How many meiotic divisions are essential in the formation of 100 seeds in cyperaceae family?please give a brief description of the events

Asked by nipunverma59 30th September 2018, 11:05 AM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

mention the product of fertilization that forms the kernel of coconut. how does the kernel differ from coconut water?

Asked by rakeshraghav33 24th August 2018, 7:16 PM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

Explain the stages involved in the maturation of a microspore into a pollen grain?

Asked by gargimoitreyee 21st April 2018, 8:31 PM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

What is meant by monosporic development of female gametophyte? 

Asked by pksunilnair 24th March 2018, 5:29 PM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

how many types of life cycles are involved in complete development of male gametophyte from pollen mother cell?

Asked by nirajkumarpanda10 26th January 2018, 11:53 PM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

how many haploid cells are present in a mature female gametophyte of a flowering plant

Asked by ananditamanhas6 6th May 2015, 4:00 PM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

What is meant by monosporic development of female gametophyte?  

Asked by Topperlearning User 12th June 2014, 10:18 AM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

(a) Draw a schematic labelled diagram of a fertilised embryo sac of an angiosperm.

Asked by Topperlearning User 12th June 2014, 10:07 AM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

Draw a labelled diagram of the sectional view of a mature pollen grain in angiosperms. Explain the functions of its different parts.

Asked by Topperlearning User 12th June 2014, 10:07 AM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

Differentiate between microsporogenesis and megasporogenesis. What type of cell division occurs during these events? Name the structures formed at the end of these two events.

Asked by Topperlearning User 12th June 2014, 10:07 AM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

Even though each pollen grain has two male gametes, why are at least 10 pollen grains and not 5 pollen grains required to fertilise 10 ovules present in a particular carpel?

Asked by Topperlearning User 12th June 2014, 10:07 AM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

Indicate the stages where meiosis and mitosis occur (1, 2 or 3) in the flowchart.        

Asked by Topperlearning User 12th June 2014, 10:07 AM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

The microscopic pollen grains of the past are obtained as fossils. Mention the characteristic of pollen grains that makes it happen.

Asked by Topperlearning User 12th June 2014, 10:07 AM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

A bilobed and dithecous anther has 100 microspore mother cells per microsporangium. How many male gametophytes can it produce?

Asked by Topperlearning User 12th June 2014, 10:07 AM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

Given below is an incomplete flowchart showing the formation of gametes in an angiospermic plant. Observe the flowchart carefully and fill in the blanks A, B, C and D.        

Asked by Topperlearning User 12th June 2014, 10:07 AM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

In angiospermic plants, before formation of microspore the sporogenous tissue undergoes cell division. (a) Name the type of cell division. (b) What would be the ploidy of the cells of tetrad? 

Asked by Topperlearning User 12th June 2014, 10:07 AM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

Draw a longitudinal section of a post-pollinated pistil showing the entry of pollen tube into a mature embryo sac. Label the filiform apparatus, chalazal end, hilum, antipodals, male gametes and secondary nucleus.

Asked by Topperlearning User 12th June 2014, 10:07 AM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

Trace the development of microsporocyte in the anther to a mature pollen grain.

Asked by Topperlearning User 12th June 2014, 10:07 AM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

(a) Draw the embryo sac of a flowering plant and label: (i) Central cell. (ii) Chalazal end. (iii) Synergids. (b) Name the cell that develops into an embryo sac and explain how this cell leads to the formation of embryo sac. (c) Mention the role played by the various cells of the embryo sac. (d) Give the role of filiform apparatus.

Asked by Topperlearning User 12th June 2014, 10:07 AM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

The most biologically resistant material is seen in plants. a) Where do you see it in plants? b) What is it called?

Asked by Topperlearning User 12th June 2014, 10:07 AM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

Outer envelope of a pollen grain is made of a highly resistant substance. What is that substance and at which particular point is it absent?

Asked by Topperlearning User 12th June 2014, 10:07 AM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

Arrange the following in the correct developmental sequence: Male gamete, potential pollen mother cell, sporogenous tissue, pollen grains, microspore tetrad.

Asked by Topperlearning User 12th June 2014, 10:07 AM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

Mention the reasons for the difference in ploidy of zygote and primary endosperm nucleus in an angiosperm.

Asked by Topperlearning User 12th June 2014, 10:07 AM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

An anther with a malfunctioning tapetum often fails to produce viable male gametophytes. Why?

Asked by Topperlearning User 12th June 2014, 10:07 AM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

In a young anther, a group of compactly arranged homogenous cells were observed in the centre of each microsporangium. What is the name given to these cells?

Asked by Topperlearning User 12th June 2014, 10:07 AM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

Name the parts A, B, C and D of the anatropous ovule given below.      

Asked by Topperlearning User 12th June 2014, 10:07 AM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

Name the parts of an angiosperm flower in which the development of male and female gametophyte takes place.

Asked by Topperlearning User 12th June 2014, 10:07 AM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

Some plants have a mechanism of shedding of pollen before the maturation of stigma. Why? 

Asked by Topperlearning User 12th June 2014, 10:07 AM
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