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501 questions in this collection · Page 25 of 51
Question 241 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Double fertilization is a unique event to flowering plants. It consists of:
Since two types of fusions, syngamy and triple fusion take place in an embryo sac the phenomenon is termed double fertilization.
Question 242 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Following triple fusion, the Central Cell becomes the:
The central cell after triple fusion becomes the primary endosperm cell (PEC) and develops into the endosperm.
Question 243 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Why does endosperm development precede embryo development?
Most zygotes divide only after certain amount of endosperm is formed. This is an adaptation to provide assured nutrition to the developing embryo.
Question 244 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Coconut water represents which type of endosperm?
The coconut water from tender coconut is nothing but free-nuclear endosperm (made up of thousands of nuclei).
Question 245 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
The white kernel of the coconut represents:
The surrounding white kernel is the cellular endosperm.
Question 246 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Which of the following seeds is non-albuminous (endosperm completely consumed)?
Non-albuminous seeds have no residual endosperm... e.g., pea, groundnut. Albuminous seeds retain a part of endosperm e.g., wheat, maize, barley, castor.
Question 247 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
The "scutellum" in a monocot embryo corresponds to which structure in a dicot embryo?
In the grass family the cotyledon is called scutellum that is situated towards one side (lateral) of the embryonal axis.
Question 248 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
In the grass embryo, the "coleorrhiza" encloses the:
At its lower end, the embryonal axis has the radical and root cap enclosed in an undifferentiated sheath called coleorrhiza.
Question 249 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Perisperm is the persistent remnant of which tissue?
In some seeds such as black pepper and beet, remnants of nucellus are also persistent. This residual, persistent nucellus is the perisperm.
Question 250 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Which part of the flower develops into the pericarp of the fruit?
The wall of the ovary develops into the wall of fruit called pericarp.