Double fertilization is a unique event to flowering plants. It consists of:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: A
Answer: Syngamy and Triple Fusion.
Explanation: Since two types of fusions, syngamy and triple fusion take place in an embryo sac the phenomenon is termed double fertilization.
Following triple fusion, the Central Cell becomes the:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: C
Answer: Primary Endosperm Cell (PEC).
Explanation: The central cell after triple fusion becomes the primary endosperm cell (PEC) and develops into the endosperm.
Why does endosperm development precede embryo development?
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: The endosperm provides assured nutrition to the developing embryo.
Explanation: Most zygotes divide only after certain amount of endosperm is formed. This is an adaptation to provide assured nutrition to the developing embryo.
Coconut water represents which type of endosperm?
[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 the coconut represents:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: Cellular endosperm.
Explanation: The surrounding white kernel is the cellular endosperm.
Which of the following seeds is non-albuminous (endosperm completely consumed)?
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: D
Answer: Groundnut
Explanation: Non-albuminous seeds have no residual endosperm... e.g., pea, groundnut. Albuminous seeds retain a part of endosperm e.g., wheat, maize, barley, castor.
The "scutellum" in a monocot embryo corresponds to which structure in a dicot embryo?
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: C
Answer: Cotyledon
Explanation: In the grass family the cotyledon is called scutellum that is situated towards one side (lateral) of the embryonal axis.
In the grass embryo, the "coleorrhiza" encloses the:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: Radicle and root cap.
Explanation: At its lower end, the embryonal axis has the radical and root cap enclosed in an undifferentiated sheath called coleorrhiza.
Perisperm is the persistent remnant of which tissue?
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: Nucellus
Explanation: In some seeds such as black pepper and beet, remnants of nucellus are also persistent. This residual, persistent nucellus is the perisperm.
Which part of the flower develops into the pericarp of the fruit?
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: C
Answer: Ovary wall
Explanation: The wall of the ovary develops into the wall of fruit called pericarp.