NEET > Biology Class 12 > Detailed Overview: Pollen Grain
Detailed Overview: Pollen Grain Video Lecture - Biology Class 12 - NEET
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FAQs on Detailed Overview: Pollen Grain Video Lecture - Biology Class 12 - NEET
| 1. What is a pollen grain? |  |
Ans. A pollen grain is a small, microscopic structure produced by the male reproductive organs of plants, known as anthers. It contains the male gametes (sperm cells) and is responsible for the transfer of these gametes to the female reproductive organs of the same or a different plant for fertilization.
| 2. How is a pollen grain formed? | |
Ans. Pollen grains are formed through a process called microsporogenesis. Within the anther, specialized cells called microsporocytes undergo meiosis, resulting in the formation of four haploid microspores. Each microspore then develops into a pollen grain, which contains the necessary structures for fertilization.
| 3. What is the importance of pollen grains in plant reproduction? | |
Ans. Pollen grains play a crucial role in plant reproduction as they are responsible for the transfer of male gametes from the anther to the stigma of the same or a different plant. This process, known as pollination, leads to fertilization and the formation of seeds, ensuring the continuation of plant species.
| 4. How are pollen grains dispersed? | |
Ans. Pollen grains can be dispersed through various mechanisms, including wind, water, and animal pollinators. Wind-pollinated plants produce lightweight and numerous pollen grains that are easily carried by air currents. Water-pollinated plants release their pollen grains into the water, where they are transported to the female reproductive organs. Animal-pollinated plants produce sticky pollen grains that can adhere to the bodies of insects, birds, or other animals, which then transfer them to the stigma of other flowers.
| 5. Can pollen grains cause allergies in humans? | |
Ans. Yes, pollen grains can cause allergies in humans, known as hay fever or allergic rhinitis. When individuals with pollen allergies inhale or come into contact with pollen grains, their immune system reacts, triggering symptoms such as sneezing, itchy and watery eyes, runny nose, and congestion. The specific types of pollen that cause allergies vary depending on the individual and geographic location.
Video Description: Detailed Overview: Pollen Grain for NEET 2023 is part of Biology Class 12 preparation.
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Video Lecture & Questions for Detailed Overview: Pollen Grain Video Lecture | Biology Class 12 - NEET - NEET full syllabus preparation | Free video for NEET exam to prepare for Biology Class 12.
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157 videos|398 docs|239 tests
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Timeline
| 00:00 | Structure |
| 01:16 | Question 1 |
| 01:50 | Diseases caused by Pollen Grains |
| 02:04 | Uses |
| 03:19 | Fertilization |
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