Explanation:
The jejunum, with its long villi and microvilli, is the primary site for absorption of digested nutrients. The ileum also absorbs vitamin B₁₂ and bile salts.
Explanation:
Self-pollination (autogamy) occurs within the same flower or between flowers of the same plant. Cross-pollination (allogamy) involves different plants. Hydrophily is pollination by water, anemophily by wind. Self-pollination ensures genetic uniformity, while cross-pollination promotes variation. Cleistogamous flowers (e.g., groundnut) are obligate self-pollinators.
Explanation:
The tricuspid valve has three cusps and prevents backflow of blood from the right ventricle to the right atrium during contraction. The mitral (bicuspid) valve is on the left side. Semilunar valves are at the ventricular outlets.
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