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2346. Which of the following are involved in the making up of a DNA nucleotide ? 1. Phosphoric acid 2. Deoxyribose sugar 3. Nitrogenous base
A. 1 ande 2
B. 2 and 3
C. 1 and 3
D. 1, 2 and 3
Explanation:
2347. Multiplication of large number of identical plants is done by
A. tissue culture
B. layering
C. hydroponics
D. ringing
Explanation:
2348. Which of the following is an insectivorous plant ?
A. Hydrilla
B. Nepenthes
C. Marsilea
D. None of these
Explanation:
2349. The propagation of plants by tissue culture technique is becoming popular because
A. it is the simplest technique.
B. most plants respond to this technique.
C. variability can be increased.
D. the plants produced have uniform growth and productivity characteristics.
Explanation:
2350. When an iron nail gets rusted, iron oxide is formed
A. without any change in the weight of the nail
B. with increase in the weight of the nail
C. with decrease in the weight of the nail
D. without any change in colour or weight of the nail
Explanation:
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