The part of the seed that contains stored food for the embryo is the:
A. Cotyledon
B. Plumule
C. Radicle
D. Seed coat
Answer: Option A
Solution (By JKSSB Mock Tests)
Cotyledons are seed leaves that store food (starch, proteins, lipids) for the developing embryo and may become photosynthetic after germination. Monocots have one, dicots two. Radicle is root, plumule shoot, seed coat protects.
Explanation:
Natural passive immunity occurs when pre-formed antibodies are transferred naturally from one individual to another. During pregnancy, maternal antibodies (primarily IgG) cross the placenta to the fetus, providing temporary protection against diseases the mother is immune to. Colostrum (mother's milk) also provides IgA antibodies to the newborn.
Explanation:
The thymus gland is a primary lymphoid organ where T lymphocytes mature and become self-tolerant. Bone marrow is where B cells mature; spleen and lymph nodes are secondary.
Explanation:
The medulla oblongata contains centers for heart rate, breathing, and blood pressure. Hypothalamus controls temperature and hunger, cerebrum intelligence and memory, cerebellum coordination.
No comments yet. Be the first to start the discussion!