Pistil, megasporangium and embryo sac — practice questions

Question 1 · difficulty L1 · recall

Which part of the pistil receives pollen grains during pollination?

• A. Ovary wall
• B. Ovule
• C. Stigma
• D. Micropyle

Question 2 · difficulty L2 · understanding

Which structure inside the ovule functions as the megasporangium?

• A. Micropyle
• B. Integument
• C. Funicle
• D. Nucellus

Question 3 · difficulty L2 · understanding

How many functional megaspores usually remain after megasporogenesis in the common monosporic type of embryo-sac development?

• A. One
• B. Two
• C. Three
• D. Four

Question 4 · difficulty L3 · application

A functional megaspore undergoes three successive mitotic divisions without immediate cytokinesis. How many nuclei are produced?

• A. Four
• B. Eight
• C. Six
• D. Sixteen

Question 5 · difficulty L3 · application

One synergid in a mature embryo sac loses its filiform apparatus. Which process is most directly likely to be impaired?

• A. Development of the anther wall
• B. Meiosis of the megaspore mother cell
• C. Formation of the integuments
• D. Guidance and reception of the pollen tube near the egg apparatus

Question 6 · difficulty L3 · understanding

How many meiotic and mitotic divisions need to occur for the development of a mature female gametophyte from the megaspore mother cell in an angiosperm plant?

• A. 1 Meiosis and 3 Mitosis
• B. No Meiosis and 2 Mitosis
• C. 2 Meiosis and 3 Mitosis
• D. 1 Meiosis and 2 Mitosis

Question 7 · difficulty L3 · understanding

Which part of the ovule stores reserve food materials?

• A. Nucellus
• B. Integument
• C. Placenta
• D. Funicle

Question 8 · difficulty L3 · understanding

In angiosperms the correct sequence of events in formation of female gametophyte in the ovule is : (A) 3 successive free nuclear divisions functional megaspore. (B) Degeneration of 3 megaspores. (C) Meiotic division in megaspore mother cell. (D) Migration of 3 nuclei towards each pole. (E) Formation of wall resulting in seven celled embryosac. Choose the correct answer from the options given below :

• A. (A), (B), (C), (D), (E)
• B. (C), (E), (A), (D), (B)
• C. (B), (C), (A), (D), (E)
• D. (C), (B), (A), (D), (E)

Question 9 · difficulty L3 · understanding

In general the egg apparatus of embryo sac in angiosperm consists of

• A. One egg cell, two synergids, two antipodal cells, two Polar nuclei
• B. One egg cell, two synergids, three antipodal cells, two Polar nuclei
• C. One egg cell, two synergids, two antipodal cells, three Polar nuclei
• D. One egg cell, three synergids, two antipodal cells, two Polar nuclei

Question 10 · difficulty L3 · understanding

A typical angiosperm embryo sac at maturity is :

• A. 8-nucleate and 8-celled
• B. 8-nucleate and 7-celled
• C. 7-nucleate and 8-celled
• D. 7-nucleate and 7-celled