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

  what is callose?is callose present around the generative nucleus in microspore?

Asked by Atul Singh 21st April 2018, 12:06 AM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

pollen grains are haploid k but y  

Asked by aipatil1973 17th March 2018, 9:23 AM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

if   megasporangium  ::  ovule then microsporangium  ::  ?

Asked by imtiyazmulla68 13th March 2018, 9:14 AM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

Describe three advantages and three disadvantages of cross pollination in plants 

Asked by 483712158692241 3rd February 2018, 9:42 AM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

What is Chasmogamy..?

Asked by srivastavsanjana6 17th January 2018, 12:18 PM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

is geitenogamy self pollination or cross pollination ?

Asked by sweety 15th November 2015, 7:55 PM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

what are the different types of endosperm and how we can explain it?

Asked by maitridesai429 11th December 2014, 7:18 PM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

“Incompatibility is a natural barrier in the fusion of gametes”. Justify the statement. 

Asked by Topperlearning User 11th June 2014, 5:14 PM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

Mention the pollinating agent of an inflorescence of small dull coloured flowers with well exposed stamens and large feathery stigma. Give any one characteristic of pollen grains produced by such flowers.

Asked by Topperlearning User 11th June 2014, 5:14 PM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

The flowers of brinjal are referred to as chasmogamous while that of beans are cleistogamous. How are they different from each other?  

Asked by Topperlearning User 11th June 2014, 5:14 PM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

a) Cleistogamous flowers are strictly self pollinating”. Explain. b) What is the disadvantage of this phenomenon?

Asked by Topperlearning User 11th June 2014, 5:14 PM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

(a) Mention any four strategies adopted by flowering plants to prevent self-pollination. (b) Why is geitonogamy also referred to as genetical autogamy?   

Asked by Topperlearning User 11th June 2014, 5:14 PM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

Explain the process of artificial hybridisation to get improved crop variety in: (i) plants bearing bisexual flowers (ii) female parent producing unisexual flowers. 

Asked by Topperlearning User 11th June 2014, 5:14 PM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

(i) Write the characteristic features of anther, pollen and stigma of wind pollinated flowers. (ii) How do flowers reward their insect pollinators? Explain.

Asked by Topperlearning User 11th June 2014, 5:14 PM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

Continued self pollination leads to inbreeding depression. List three devices which flowering plants have developed to discourage self pollination?

Asked by Topperlearning User 11th June 2014, 5:14 PM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

Mention two strategies evolved to prevent self-pollination in flowers.

Asked by Topperlearning User 11th June 2014, 5:14 PM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

Among the animals, insects particularly bees are the dominant pollinating agents. List any four characteristic features of insect-pollinated flowers.

Asked by Topperlearning User 11th June 2014, 5:14 PM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

Why are pollen grains produced in enormous quantity in maize?

Asked by Topperlearning User 11th June 2014, 5:14 PM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

Pollen grains of water-pollinated species have a special characteristic for protection from water. Which is this characteristic?

Asked by Topperlearning User 11th June 2014, 5:14 PM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

Give the scientific name of a plant which came to India as a contaminant with imported wheat and caused pollen allergy.

Asked by Topperlearning User 11th June 2014, 5:14 PM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

Why pea flowers produce assured seed sets? Give reasons.

Asked by Topperlearning User 11th June 2014, 5:14 PM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

Name the type of flower which favours cross-pollination.

Asked by Topperlearning User 11th June 2014, 5:14 PM
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CBSE - XII Science - Biology - Sexual Reproduction in Flowering Plants

Differentiate between geitonogamy and xenogamy.

Asked by Topperlearning User 11th June 2014, 5:14 PM
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