Question:
Which of the following statements is wrong?
Which of the following statements is wrong?
Updated On: Jun 18, 2022
- Pollen grains remain viable for several months because their outer covering is made of sporopollenin
- No enzyme can degrade sporopollenin
- Pollen grains are well represented in fossil strata due to sporopollenin
- Pollen wall has cavities containing proteins
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The Correct Option is D
Solution and Explanation
Pollen wall comprises of two principal layers the inner inline and outer exine. The inline is pectocellulosic in nature. A special feature of intine is the presence of beads, ribbons, or plates of enzymatic proteins particularly in vicinity of germ pores. The exiten is composed of sporopollenin which is derived from carotenoids by oxidative polymerization. It is resistant to physical and biological decomposition. Due to this, pollen walls are often preserved for long periods in fossil deposits.
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Concepts Used:
Sexual Reproduction in Flowering Plants
Sexual reproduction in flowering plants takes place or happens when the production of a new organism occurs from two parents by making use of their gametes or sex cells. Both sexual and asexual reproduction can be found in plants. Nearly all flowering plants reproduce sexually. Flowers play a captious role in the process as it carries both the male and female reproductive parts commonly known as androecium and gynoecium respectively.
An individual flower comprises the following parts -
- Pedicle
- Calyx
- Petals
- Sepals
- Stamen
- Pistil
- Receptacle