KCET · BIOLOGY · STD 12 - 1. Sexual Reproduction in Flowering Plants
Sporopollenin, a chemical substance is found in __________
- A intine of pollen grain
- B exine of pollen grain
- C endothecium of anther
- D tapetum of anther
Answer & Solution
Correct Answer
(B) exine of pollen grain
Step-by-step Solution
Detailed explanation
(B) exine of pollen grain,
Sporopollenin, found in the exine of pollen grains, is highly resistant to extreme conditions and degradation. In contrast, the intine of pollen grains is composed of pectocellulosic material and lacks sporopollenin. The sporogenous tissue layer, specially the endothecium, supports anther dehiscence, while the tapetum nourishes the developing pollen grains.
Sporopollenin, found in the exine of pollen grains, is highly resistant to extreme conditions and degradation. In contrast, the intine of pollen grains is composed of pectocellulosic material and lacks sporopollenin. The sporogenous tissue layer, specially the endothecium, supports anther dehiscence, while the tapetum nourishes the developing pollen grains.
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