The tapetal cells are generally:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: C
Answer: Bi-nucleate or multi-nucleate with dense cytoplasm
Explanation: Cells of the tapetum possess dense cytoplasm and generally have more than one nucleus.
Sporopollenin is absent at the:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: C
Answer: Germ pores
Explanation: Pollen grain exine has prominent apertures called germ pores where sporopollenin is absent.
In which plants does the pollen grain viability last for months?
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: Rosaceae, Leguminoseae, Solanaceae
Explanation: In some members of Rosaceae, Leguminoseae and Solanaceae, they maintain viability for months.
The arrangement of microspores in a cluster of four cells is called:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: Microspore tetrad
Explanation: The microspores, as they are formed, are arranged in a cluster of four cells–the microspore tetrad.
Which part of the pistil contains the ovarian cavity?
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: C
Answer: Ovary
Explanation: Inside the ovary is the ovarian cavity (locule).
In the 8-nucleate embryo sac, how are the nuclei distributed?
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: A
Answer: 3 at micropylar end, 3 at chalazal end, 2 in center
Explanation: 3 cells (egg apparatus) at micropylar end, 3 cells (antipodals) at chalazal end, and 2 polar nuclei in the large central cell.
Pollination involving the transfer of pollen from the anther to the stigma of the SAME flower is:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: A
Answer: Autogamy
Explanation: Transfer of pollen grains from the anther to the stigma of the same flower... is called autogamy.
Flowers that do not open at all are termed:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: Cleistogamous
Explanation: Cleistogamous flowers which do not open at all.
Which agent is the dominant biotic pollinating agent?
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: C
Answer: Bees
Explanation: Among the animals, insects, particularly bees are the dominant biotic pollinating agents.
What is the function of the "coleoptile"?
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: It encloses the shoot apex and leaf primordia.
Explanation: Epicotyl has a shoot apex and a few leaf primordia enclosed in a hollow foliar structure, the coleoptile.