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Pre-Fertilisation: Structure & Events Video Lecture - NEET
FAQs on Pre-Fertilisation: Structure & Events Video Lecture - NEET
| 1. What is the structure of pre-fertilisation? |  |
Ans. Pre-fertilisation refers to the events and structures that occur before fertilisation takes place. In plants, the male gametes are produced in the pollen grains, while the female gametes are located within the ovules. The pollen grains are released and transported by various means, such as wind or insects, to the stigma of the flower. Once on the stigma, the pollen grain germinates and develops a pollen tube, which grows down through the style towards the ovary.
| 2. What events occur during pre-fertilisation? | |
Ans. During pre-fertilisation, several events take place. First, the pollen grain lands on the stigma and germinates, forming a pollen tube. This tube grows down through the style towards the ovary. Meanwhile, the ovule undergoes changes, including the formation of an embryo sac which contains the female gametes. The pollen tube then reaches the embryo sac, and the male gametes are released. Fertilisation occurs when one of the male gametes fuses with the female gamete, resulting in the formation of a zygote.
| 3. How are pollen grains transported to the stigma? | |
Ans. Pollen grains can be transported to the stigma through various means. In wind-pollinated plants, the pollen grains are lightweight and produced in large quantities, allowing them to be easily carried by air currents. Insect-pollinated plants, on the other hand, produce heavier pollen grains that are often sticky or have structures that allow them to attach to insects' bodies. These insects then inadvertently transfer the pollen grains to other flowers as they move from one flower to another in search of nectar.
| 4. What is the function of the pollen tube during pre-fertilisation? | |
Ans. The pollen tube plays a crucial role during pre-fertilisation. Its main function is to transport the male gametes from the stigma to the ovary. Once the pollen grain germinates on the stigma, it develops a pollen tube that grows down through the style towards the ovary. This tube acts as a pathway for the male gametes to reach the embryo sac, where fertilisation takes place. The pollen tube provides a protective and efficient means of delivering the male gametes to the female gametes.
| 5. What are the structures involved in pre-fertilisation in plants? | |
Ans. Pre-fertilisation in plants involves several structures. The male gametes are produced within the pollen grains, which are released from the anthers of the flower. The female gametes are located within the ovules, which are contained within the ovary. The stigma is the receptive surface where the pollen grains land and germinate. The style is a slender tube-like structure that connects the stigma to the ovary. The ovary contains the ovules, which undergo changes to form the embryo sac. Overall, these structures work together to facilitate the process of fertilisation in plants.
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