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2351. Rigidity of cell wall is due to
A. chitin
B. lignin
C. suberin
D. pectin
Explanation:
2352. When sulphur dioxide increases in atmosphere, the most suitable pollution indicators are
A. algae
B. algae and ferns
C. fungi
D. moss and lichens
Explanation:
2353. Which of the following weeds has been found useful to check water pollution caused by industrial effluents ?
A. Parathenium
B. Elephant grass
C. Water hyacinth
D. Both (A) and (B) above
Explanation:
2354. .................... of the total suns rays reaching the earth is used up by plants in photosynthesis.
A. 1%
B. 10%
C. 25%
D. 33%
Explanation:
2355. Ants are always seen moving in a line one after another. They trace the path because of the secretion of chemicals called
A. detectors
B. sex hormones
C. pheromones
D. None of these
Explanation:
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