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Various Parts of a Flower and Process of Pollination Video Lecture - Class 7
FAQs on Various Parts of a Flower and Process of Pollination Video Lecture - Class 7
| 1. What are the different parts of a flower and their functions? |  |
Ans. The different parts of a flower and their functions are as follows:
- Petals: They are colorful and attract pollinators like bees and butterflies.
- Sepals: They protect the flower bud before it blooms.
- Stamen: It is the male reproductive part that produces pollen.
- Pistil: It is the female reproductive part that contains the ovary.
- Ovary: It holds the ovules, which develop into seeds after fertilization.
| 2. How does pollination occur in flowers? | |
Ans. Pollination in flowers occurs when pollen grains are transferred from the stamen (male part) to the pistil (female part). This transfer can happen through various mechanisms:
- Insect pollination: Insects like bees and butterflies carry pollen from one flower to another while collecting nectar.
- Wind pollination: Some flowers release lightweight pollen grains that are carried away by the wind to reach other flowers.
- Self-pollination: In certain flowers, the pollen from the stamen is transferred to the pistil of the same flower.
- Cross-pollination: In other flowers, pollen from one flower is transferred to the pistil of a different flower, promoting genetic diversity.
| 3. What is the role of petals in the pollination process? | |
Ans. Petals play a crucial role in the pollination process. They are often brightly colored and have attractive patterns to attract pollinators like bees, butterflies, and birds. The pollinators are drawn to the flowers due to their visual appeal and the promise of nectar. As the pollinators land on the petals, they come into contact with the pollen grains present on the stamen. These grains stick to the bodies of the pollinators and are carried to other flowers when the pollinators move around, thus aiding in pollination.
| 4. How does the ovary contribute to the process of pollination? | |
Ans. The ovary is a part of the pistil, the female reproductive organ of a flower. It plays a crucial role in the pollination process as it contains the ovules, which develop into seeds after fertilization. During pollination, pollen grains from the stamen land on the stigma, which is located at the top of the pistil. From there, the pollen grains travel down the style, a long tube-like structure, and reach the ovary. If the pollen grains successfully fertilize the ovules inside the ovary, they develop into seeds, leading to the formation of fruits.
| 5. What is the significance of sepals in the life cycle of a flower? | |
Ans. Sepals are the outermost part of a flower and are usually green in color. They play a vital role in the life cycle of a flower by protecting the flower bud before it blooms. Sepals enclose and protect the developing flower bud, shielding it from external factors like harsh weather conditions, pests, and diseases. As the flower bud grows, the sepals provide support and ensure proper protection until the flower is ready to open. Once the flower blooms, the sepals may remain attached or fall off, depending on the species.
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Nov 15, 2024 Last updated |
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