Seeds that retain endosperm at maturity are called:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: Albuminous
Explanation: Albuminous seeds retain a part of endosperm as it is not completely used up during embryo development.
The wall of the fruit is technically called the:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: C
Answer: Pericarp
Explanation: The wall of the ovary develops into the wall of fruit called pericarp.
Which hormone can be applied to induce parthenocarpy?
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: A
Answer: Auxins/Growth hormones
Explanation: Parthenocarpy can be induced through the application of growth hormones.
A typical angiosperm embryo sac is formed from:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: A
Answer: A single megaspore
Explanation: This method of embryo sac formation from a single megaspore is termed monosporic development.
The central cell of the embryo sac contains:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: Two polar nuclei
Explanation: The large central cell... has two polar nuclei.
Wind pollinated flowers usually have:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: A
Answer: A single ovule in the ovary
Explanation: Wind-pollinated flowers often have a single ovule in each ovary.
In Vallisneria, the male flowers/pollen are released:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: On the surface of the water
Explanation: The male flowers or pollen grains are released on to the surface of water.
Which of the following plants provides a safe place for the moth to lay eggs?
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: Amorphophallus
Explanation: In some species floral rewards are in providing safe places to lay eggs; an example is that of the tallest flower of Amorphophallus.
Continued self-pollination results in:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: Inbreeding depression
Explanation: Continued self-pollination result in inbreeding depression.
Which outbreeding device prevents both autogamy and geitonogamy?
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: D
Answer: Dioecy
Explanation: In several species such as papaya... (dioecy). This condition prevents both autogamy and geitonogamy.