Coconut water from a tender coconut represents:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: Free-nuclear endosperm
Explanation: The coconut water from tender coconut is nothing but free-nuclear endosperm (made up of thousands of nuclei).
The white kernel of a coconut represents:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: Cellular endosperm
Explanation: The coconut water is free-nuclear endosperm and the surrounding white kernel is the cellular endosperm.
Which of the following seeds is non-albuminous (endosperm consumed)?
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: D
Answer: Groundnut
Explanation: Non-albuminous seeds have no residual endosperm as it is completely consumed during embryo development (e.g., pea, groundnut). Castor, wheat, and maize are albuminous.
The residual, persistent nucellus in seeds like black pepper and beet is called:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: Perisperm
Explanation: In some seeds such as black pepper and beet, remnants of nucellus are also persistent. This residual, persistent nucellus is the perisperm.
The single cotyledon in the grass family embryo is called:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: A
Answer: Scutellum
Explanation: In the grass family the cotyledon is called scutellum that is situated towards one side (lateral) of the embryonal axis.
The sheath enclosing the plumule in a monocot embryo is called:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: C
Answer: Coleoptile
Explanation: Epicotyl has a shoot apex and a few leaf primordia enclosed in a hollow foliar structure, the coleoptile.
Which part of the flower contributes to fruit formation in false fruits like apple and strawberry?
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: Thalamus
Explanation: In a few species such as apple, strawberry, cashew, etc., the thalamus also contributes to fruit formation. Such fruits are called false fruits.
Fruits that develop without fertilization are called:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: C
Answer: Parthenocarpic fruits
Explanation: There are a few species in which fruits develop without fertilization. Such fruits are called parthenocarpic fruits (e.g., banana).
The oldest viable seed discovered, Lupinus arcticus, was estimated to be dormant for how many years?
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: D
Answer: 10000 years
Explanation: The oldest is that of a lupine, Lupinus arcticus excavated from Arctic Tundra. The seed germinated and flowered after an estimated record of 10,000 years of dormancy.
Apomixis is a form of asexual reproduction that mimics:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: Sexual reproduction
Explanation: Apomixis is a form of asexual reproduction that mimics sexual reproduction, producing seeds without fertilization.