Grade 12 Exam > Grade 12 Videos > Biology for Grade 12 > Detailed Overview: Double Fertilisation
Detailed Overview: Double Fertilisation Video Lecture | Biology for Grade 12
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FAQs on Detailed Overview: Double Fertilisation Video Lecture - Biology for Grade 12
| 1. What is double fertilisation? |  |
Ans. Double fertilisation is a unique reproductive process that occurs in flowering plants (angiosperms). It involves the fusion of two sperm cells with two different female gametes, leading to the formation of both the embryo and endosperm.
| 2. How does double fertilisation occur? | |
Ans. Double fertilisation occurs when a pollen grain lands on the stigma of a flower and produces a pollen tube. One sperm cell travels down the pollen tube to fertilise the egg cell, forming the zygote (embryo). The other sperm cell fuses with the two polar nuclei in the ovule, resulting in the formation of the endosperm.
| 3. What is the significance of double fertilisation in plants? | |
Ans. Double fertilisation is significant because it ensures the coordinated development of the embryo and endosperm. The endosperm provides nourishment to the developing embryo, while the embryo develops into a new plant. This process helps in the successful reproduction and survival of flowering plants.
| 4. Which plants undergo double fertilisation? | |
Ans. Double fertilisation is a characteristic feature of flowering plants (angiosperms). It occurs in all angiosperms, including both monocots and dicots. This reproductive strategy sets angiosperms apart from other plant groups, such as gymnosperms.
| 5. What are the differences between double fertilisation and single fertilisation? | |
Ans. Single fertilisation, which occurs in non-flowering plants like gymnosperms, involves the fusion of one sperm cell with the egg cell to form the zygote, without the formation of endosperm. In contrast, double fertilisation in flowering plants involves the fusion of two sperm cells, leading to the formation of both the embryo and endosperm. This unique process is one of the defining characteristics of angiosperms.
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