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- Question
Plants absorb dissolved nitrates from soil and convert them into
Options- A. free nitrogen
- B. urea
- C. ammonia
- D. proteins
- Correct Answer
- free nitrogen
- 1. Night blindness is cause by lack of which vitamin?
Options- A. Vitamin A
- B. Vitamin B
- C. Vitamin C
- D. Vitamin D Discuss
- 2. Phloem is a tissue found in
Options- A. reproductive organs of animals
- B. plants
- C. insects
- D. mammals Discuss
- 3. 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
- 4. Prokaryotic cells lack
Options- A. nucleolus
- B. nuclear membrane
- C. membrane bound by organelles
- D. All of these Discuss
- 5. Most highly intelligent mammals are
Options- A. whales
- B. dolphins
- C. elephants
- D. kangaroos Discuss
- 6. 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
- 7. 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
- 8. Other than spreading malaria, anopheles mosquitoes are also vectors of
Options- A. dengue fever
- B. filariasis
- C. encephalitis
- D. yellow fever Discuss
- 9. Plants absorb most part of water needed by them through their
Options- A. embryonic zone
- B. growing point
- C. root hairs
- D. zone of elongation Discuss
- 10. Nitrogen is fixed in ecosystems in ways stated below. Which one of the statements below is false?
Options- A. By cyanobacteria
- B. By electrical discharges in the atmosphere
- C. By industrially synthesised fertilizer
- D. By denitrification Discuss
Biology problems
Search Results
Correct Answer: Vitamin A
Correct Answer: plants
Correct Answer: hormones
Correct Answer: All of these
Correct Answer: dolphins
Correct Answer: anthocyanin
Explanation:
Anthocyanin - A blue, violet, or red flavonoid pigment found in plants.
Correct Answer: phototropism
Correct Answer: filariasis
Correct Answer: root hairs
Correct Answer: By denitrification
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