This set of Class 12 Biology Chapter 2 Multiple Choice Questions & Answers (MCQs) focuses on “Reproduction in Flowering Plants – Structure of Seed”.
1. Dicots and monocots are types of seeds.
Explanation: Though the seeds differ greatly, the early stages of embryo development (embryogeny) are similar in both monocotyledons and dicotyledons.
2. ___ divide after endosperm formation.
Explanation: Zygotes divide after endosperm formation. Reason being, zygote can not provide nutrition for itself. Endosperm is required to provide it with nutrition. It is an adaptation.
3. Embryogeny occurs at _______ end.
Explanation: The changes that occur during the development of embryo from zygote is defined as embryogeny. It takes place at the micropylar end of the embryo sac.
4. The larger basal cells in dicots are called the _____ cells.
Explanation: The larger basal cell in dicotyledons are termed as suspensor cell. The one towards the antipodal end is called as embryo cell or terminal cell.
5. The embryo (in dicots) undergo 2 vertical divisions.
Explanation: The embryo cell in dicots undergoes two vertical divisions (quadrant stage) and one transverse division to form eight cells arranged in two tiers (octant stage) – epibasal (terminal) and hypobasal (near the suspensor).
6. The outer layer in dicots is called _____
b) ground meristem
Explanation: The octants (eight embryonic) cells divide periclinally (type of cell division that occurs parallel to the cells) to produce a dermatogen or an outer layer of protoderm. The inner cells differentiate into ground meristem (periblem) and procambium (plerome).
7. In dicots, the epidermis is formed by the _______
b) ground meristem
Explanation: Protoderm forms epidermis, procambium gives rise to stele or vascular strand and ground meristem produces cortex and pith.
8. In ______, the embryo remains in the globular form.
Explanation: In some plant species the embryo remains in the spherical or globular form even at the time of seed shedding without showing any differentiation of radicle, plumule and cotyledons, e.g., Orobanche, Utricularia, Orchids.
9. In monocots, the ____ end produces the suspensor cells.
Explanation: The zygote or oospore extends and then divides diagonally to form basal and terminal cells. The basal cell (towards micropylar end) produces a big swollen, vesicular suspensor cell.
10. In monocots, the suspensor cell may function as a ______
Explanation: The suspensor cell may function like a haustorium. The terminal cell divides by another diagonal wall to form two cells. The top cell after several divisions forms the plumule and a single cotyledon.
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