Biology problems
- 1. Ptyalin is an enzyme produced in the
Options- A. salivary glands
- B. pituitary glands
- C. thyroid glands
- D. pancreas Discuss
Correct Answer: salivary glands
- 2. One of the following is most suitable for study of mutations
Options- A. Haploids
- B. Diploids
- C. Tetraploids
- D. Polyploid Discuss
Correct Answer: Haploids
- 3. Most highly intelligent mammals are
Options- A. whales
- B. dolphins
- C. elephants
- D. kangaroos Discuss
Correct Answer: dolphins
- 4. Prokaryotic cells lack
Options- A. nucleolus
- B. nuclear membrane
- C. membrane bound by organelles
- D. All of these Discuss
Correct Answer: All of these
- 5. Organic Substances which, in very small amounts, control growth and development called
Options- A. vitamins
- B. hormones
- C. enzymes
- D. None of the above Discuss
Correct Answer: hormones
- 6. Phloem is a tissue found in
Options- A. reproductive organs of animals
- B. plants
- C. insects
- D. mammals Discuss
Correct Answer: plants
- 7. Night blindness is cause by lack of which vitamin?
Options- A. Vitamin A
- B. Vitamin B
- C. Vitamin C
- D. Vitamin D Discuss
Correct Answer: Vitamin A
- 8. Plants absorb dissolved nitrates from soil and convert them into
Options- A. free nitrogen
- B. urea
- C. ammonia
- D. proteins Discuss
Correct Answer: free nitrogen
- 9. Most of the red, blue and purple colours of plants are due to a pigment called
Options- A. anthocyanin
- B. carotene
- C. chlorophyll
- D. xanthophylls Discuss
Correct Answer: anthocyanin
Explanation:
Anthocyanin - A blue, violet, or red flavonoid pigment found in plants.
- 10. Plant bends towards the source of light on account of the movement of curvature known as
Options- A. geotropism
- B. thigmotropism
- C. chemotropism
- D. phototropism Discuss
Correct Answer: phototropism
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