Discussion
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- Question
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
- Correct Answer
- By denitrification
- 1. 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
- 2. Other than spreading malaria, anopheles mosquitoes are also vectors of
Options- A. dengue fever
- B. filariasis
- C. encephalitis
- D. yellow fever Discuss
- 3. 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
- 4. 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
- 5. Plants absorb dissolved nitrates from soil and convert them into
Options- A. free nitrogen
- B. urea
- C. ammonia
- D. proteins Discuss
- 6. Monocot root differs from dicot root in having
Options- A. open vascular bundles
- B. scattered vascular bundles
- C. well developed pith
- D. radially arranged vascular bundles Discuss
- 7. Plants that grow in saline water are called
Options- A. halophytes
- B. hydrophytes
- C. mesophytes
- D. thallophytes Discuss
- 8. Plants wilt due to excess of
Options- A. transpiration
- B. photosynthesis
- C. absorption
- D. None of these Discuss
- 9. O2 released in the process of photosynthesis comes from
Options- A. CO2
- B. water
- C. sugar
- D. pyruvic acid Discuss
- 10. Photo-oxidation is
Options- A. photorespiration
- B. photolysis
- C. light and oxygen induced breakdown
- D. All of the above Discuss
Biology problems
Search Results
Correct Answer: root hairs
Correct Answer: filariasis
Correct Answer: phototropism
Correct Answer: anthocyanin
Explanation:
Anthocyanin - A blue, violet, or red flavonoid pigment found in plants.
Correct Answer: free nitrogen
Correct Answer: well developed pith
Correct Answer: halophytes
Correct Answer: transpiration
Correct Answer: water
Correct Answer: All of the above
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