The Megaspore Mother Cell (MMC) differentiates in which region of the nucellus?
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: Micropylar region
Explanation: Ovules generally differentiate a single megaspore mother cell (MMC) in the micropylar region of the nucellus.
What is the ploidy of the Megaspore Mother Cell (MMC)?
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: Diploid
Explanation: The MMC undergoes meiotic division... results in the production of four megaspores. (Implies MMC is diploid/sporophytic).
In the formation of the embryo sac, the functional megaspore undergoes how many sequential mitotic divisions?
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: C
Answer: Three
Explanation: The nucleus of the functional megaspore divides mitotically to form two nuclei... Two more sequential mitotic nuclear divisions result in the formation of the 4-nucleate and later the 8-nucleate stages.
The egg apparatus in an embryo sac consists of:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: One egg and two synergids
Explanation: The egg apparatus, in turn, consists of two synergids and one egg cell.
Which part of the pistil serves as a landing platform for pollen grains?
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: C
Answer: Stigma
Explanation: The stigma serves as a landing platform for pollen grains.
Autogamy requires synchrony between:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: A
Answer: Pollen release and stigma receptivity
Explanation: Autogamy in such flowers requires synchrony in pollen release and stigma receptivity.
Flowering plants use which biotic agent most dominantly for pollination?
[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.
Pollination by water is limited to approximately how many genera?
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: 30
Explanation: Pollination by water is quite rare in flowering plants and is limited to about 30 genera, mostly monocotyledons.
In water hyacinth, the flowers emerge above the water level and are pollinated by:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: Insects or wind
Explanation: In a majority of aquatic plants such as water hyacinth... the flowers emerge above the level of water and are pollinated by insects or wind.
Which of the following is NOT a floral reward for pollinators?
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: D
Answer: Foul odour
Explanation: Nectar and pollen grains are the usual floral rewards... foul odours (are used) to attract these animals (flies/beetles), not as a reward.