CBSE Class 12-science Biology Double Fertilisation, Post Fertilisation: Structures and Events
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- What is post fertilisation? Define in short?
- what is pollen pistil interaction? describe in detail
- In the given figure of a dicot embryo, label the
parts (A) and (B) and give their functions.
- What will be the fate of the following structures in an angiospermic plant? Ovary wall, ovule, zygote, outer integument, inner integument and primary endosperm nucleus.
- Name the common function that is performed by cotyledons and nucellus.
- Why is the process of fertilisation in a flowering plant referred to as double fertilisation? Explain.
- In the same species of Asteraceae and grasses, seeds are formed without the fusion of gametes. Mention the scientific term for such a form of reproduction.
- Fruits generally develop from the ovary, but in few species the thalamus contributes to fruit formation. (a) Name the two categories of fruits. (b) Give one example of each.
- Name the blank spaces a, b, c and d in the table given below. Part What it represents in the plant? (i) Pericarp a (ii) b Cotyledon in seeds of grass family (iii) Embryonal axis c (iv) d Remains of nucellus in a seed.
- Which is the triploid tissue in a fertilized ovule? How is the triploid condition achieved?
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