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501 questions in this collection · Page 4 of 51
Question 31 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Coconut water from a tender coconut represents:
The coconut water from tender coconut is nothing but free-nuclear endosperm (made up of thousands of nuclei).
Question 32 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
The white kernel of a coconut represents:
The coconut water is free-nuclear endosperm and the surrounding white kernel is the cellular endosperm.
Question 33 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Which of the following seeds is non-albuminous (endosperm consumed)?
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.
Question 34 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
The residual, persistent nucellus in seeds like black pepper and beet is called:
In some seeds such as black pepper and beet, remnants of nucellus are also persistent. This residual, persistent nucellus is the perisperm.
Question 35 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
The single cotyledon in the grass family embryo is called:
In the grass family the cotyledon is called scutellum that is situated towards one side (lateral) of the embryonal axis.
Question 36 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
The sheath enclosing the plumule in a monocot embryo is called:
Epicotyl has a shoot apex and a few leaf primordia enclosed in a hollow foliar structure, the coleoptile.
Question 37 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Which part of the flower contributes to fruit formation in false fruits like apple and strawberry?
In a few species such as apple, strawberry, cashew, etc., the thalamus also contributes to fruit formation. Such fruits are called false fruits.
Question 38 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Fruits that develop without fertilization are called:
There are a few species in which fruits develop without fertilization. Such fruits are called parthenocarpic fruits (e.g., banana).
Question 39 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
The oldest viable seed discovered, Lupinus arcticus, was estimated to be dormant for how many years?
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.
Question 40 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Apomixis is a form of asexual reproduction that mimics:
Apomixis is a form of asexual reproduction that mimics sexual reproduction, producing seeds without fertilization.