An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is:
Correct answer: B. Sporopollenin
- A. Cuticle
- B. Sporopollenin
- C. Lignin
- D. Cellulose
Explanation
Sporopollenin is a major component of the tough outer (exine) walls of spores and pollen grains. It is chemically very stable and is usually well preserved in soils and sediments. It can withstand environmental extremes and cannot be degraded by enzymes and strong chemical reagents.
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Human reproduction covers the male and female reproductive organs, gamete formation, fertilization, implantation and hormonal regulation. The menstrual cycle includes ovarian and uterine changes controlled by pituitary and ovarian hormones, while sexually transmitted diseases are studied through their causes, transmission, symptoms, prevention and effects on fertility.
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