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291.
Which one of the following is a long day plant?
Answer: A
Explanation:
292.
Zeatin has been isolated and identified from the milky endosperm of:
Answer: C
Explanation:
293.
Process of endosmosis stop:
A. When water concentration become equal
B. When solution become isotonic
C. When the leaves fall
D. When there is no light
Answer: B
Explanation:
294.
Most of the ______ flowers contain carotenoid especially xanthophyll type and it is believed that they benefit certain plants by attracting pollinating insects:
Answer: D
Explanation:
295.
Symbiotic nitorgen fixing bacteria occur in the genus:
A. Xanthomonas
B. Pseudomonas
C. Rhizobium
D. Azotobacter
Answer: A
Explanation:
296.
Which pigment is is absent in chloroplast?
A. Xanthophyll
B. Anthocyanin
C. Chlorophyll-a
D. Carotene
Answer: B
Explanation:
297.
Deficiency of Mo causes:
A. Yellowing of leaves
B. Mottling and necrosis of leaves
C. Poor development of vasculature
D. Bending of leaf tip
Answer: B
Explanation:
298.
On the basis of symptoms of chlorosis in leaves a student inferred that this was due to deficiency of nitorgen. This inference could be correct only if we assume that yellowing of leaves appeared first in:
A. Young leaves
B. Old leaves
C. Matured leaves followed by young leaves
D. Young leaves followed by mature leaves
Answer: B
Explanation:
299.
Pineapple can be made to flower in off-season by:
A. Zeatin
B. Ethylene
C. Temperature
D. Short days
Answer: B
Explanation:
300.
Die-back' of citrus is caused due to the deficiency of:
Answer: B
Explanation:
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