Which of the following is an example of a saprophytic angiosperm? MCQ with Answer and Explanation

Explanation:
Lysosomes are membrane-bound vesicles packed with hydrolytic enzymes (proteases, lipases, nucleases) that digest macromolecules, old organelles, and engulfed pathogens. They maintain an acidic pH (about 5.0) for optimal enzyme activity. Peroxisomes detoxify peroxides, mitochondria generate ATP, chloroplasts perform photosynthesis.

Explanation:
Earthworms have hemoglobin dissolved in their blood plasma (not in cells) for oxygen transport. Hemocyanin is in mollusks and arthropods, hemerythrin in some marine worms.

Explanation:
Vitamin D (cholecalciferol) is synthesized in the skin from 7-dehydrocholesterol under UV-B radiation. It then undergoes activation in the liver and kidneys. It regulates calcium and phosphate metabolism.