CBSE Class 12th Biology Chapter 2 - Sexual Reproduction in Flowering Plants Important Questions with Answers

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Pollen banks are playing a very important role in promoting plant breeding programme the world over.
How are pollens preserved in the pollen banks? Explain. How are such banks benefitting our farmers? Write any two ways. (Delhi 2019)

Question 2.

What is cleistogamy? Write one advantage and one disadvantage of it, to the plant. (All India 2019)

Question 3.

You are conducting artificial hybridisation on papaya and potato. Which one of them would require the step of emasculation and why ? However for both you will use the process of bagging. Justify giving one reason. (Delhi 2019)

Question 4.

Express the process of pollination in Vallisneria. (Delhi 2019)

Question 5.

(i) Draw a LS of pistil showing pollen tube entering into the embryo sac. Label the following. (All India 2019)
(a) Nucellus
(b) Antipodals
(c) Synergids
(d) Micropyle(ii) Write the functions of the following
(a) Synergids
(b) Micropyle

Question 6.

Emasculation and bagging are the two important steps carried during artificial hybridisation to obtain superior varieties of desired plants. Explain giving reasons, in which types of flowers and at what stages are the two processes carried out. (All India 2019)

Question 7.

(i) Differentiate between geitonogamy and xenogamy.
(ii) Write the difference in the characteristics of the progeny produced as a result of the two processes. (Delhi 2019)

Question 8.

How does a bisexual flowering plant ensure cross-pollination ? Explain. (Delhi 2019)

Question 9.

It is said apomixis is a type of asexual reproduction. Justify. (Delhi 2019)

Question 10.

State what is apomixis? Write its significance. How can it be commercially used? (All India 2019)

Question 1.

(i) Explain any two ways by which apomictic seed can develop.
(ii) List one advantage and one disadvantage of an apomictic crop.
(iii) Why do farmers find production of hybrid seeds costly? (Delhi 2019)

Question 2.

Write one advantage and one disadvantage of cleistogamy to flowering plants. (2018C)

Question 3.

Differentiate between parthenocarpy and parthenogenesis. Give one example of each. (2018C)

Question 4.

If the meiocyte of a maize plant contains 20 chromosomes. Write the number of chromosomes in the endosperm and embyro of the maize grain and give reasons in support of your answer. (2018C)

Question 5.

Do you think apomixis can be compared with asexual reproduction? Support your answer, giving one reason. How is apomixis beneficial to farmers? Explain. (2018 C)

Question 6.

In a flowering plant, a microspore mother cell produces four male gametophytes while a megaspore mother cell forms only one female gametophyte. Explain. (Delhi 2017)

Question 7.

(i) When a seed of an orange is squeezed, many embryos, instead of one are observed. Explain, how it is possible.
(ii) Are these embryos genetically similar or different? Comment. (India 2017)

Question 8.

Angiosperms bearing unisexual flowers are said to be either monoecious or dioecious. Explain with the help of one example each. (All India 2016)

Question 9.

Gynoecium of a flower may be apocarpous or syncarpous. Explain with the help of an example each. (Delhi 2016)

Question 10.

(i) Name the organic material exine of the pollen grain is made up of. How is this material advantageous to pollen grain?
(ii) Still it is observed that it does not form a continuous layer around the pollen grain. Give reason.
(iii) How are ‘pollen banks’ useful? (All India 2016C)