Which plant hormone is responsible for the 'bolting' effect in rosette plants like cabbage and beet?
A. Gibberellin
B. Abscisic acid
C. Auxin
D. Cytokinin
Answer: Option A
Solution (By JKSSB Mock Tests)
Gibberellins (GAs) promote stem elongation. In rosette plants (like cabbage, beet, and radish) that have a short stem and closely packed leaves, the application of gibberellin induces sudden and rapid stem elongation just before flowering, a phenomenon known as 'bolting'. This is widely used in agriculture.
Explanation:
Algae and aquatic plants are primary producers in pond ecosystems, converting solar energy into biomass through photosynthesis. Fish and frogs are consumers, water beetles are also consumers. Producers form the base of the food web.
Explanation:
Self-pollination (autogamy) occurs within the same flower. Geitonogamy is pollination between different flowers of the same plant, functionally cross-pollination. Xenogamy is between different plants. Self-pollination leads to genetic uniformity.
Consider statements about nutrition: 1. Kwashiorkor is caused by protein deficiency. 2. Marasmus is caused by overall calorie deficiency. 3. Goiter is caused by iron deficiency. Which are correct?
Explanation:
Kwashiorkor is a severe form of malnutrition caused by inadequate protein intake despite sufficient calorie consumption. Marasmus results from a severe deficiency of both calories and protein, leading to extreme wasting. Goiter is the enlargement of the thyroid gland caused by iodine deficiency, not iron deficiency (which causes anemia). Thus, statements 1 and 2 are correct.
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