Advertisements
Advertisements
Question
Long Answer Question:
Draw a labeled diagram of the L.S. of anatropous ovule and list the components of the embryo sac and mention their fate after fertilization.
Solution
1. Structure of anatropous ovule:
2. List the components of embryo sac and mention their fate after fertilization:
| Components of the embryo sac | Fate after fertilization |
| Ovule | Seed |
| Egg | Embryo |
| Nucellus | Perisperm |
| Secondary nucleus | Endosperm |
| Outer integument | Testa (outer seed coat) |
| Inner integument | Tegmen (inner seed coat) |
| Micropyle | An opening in the seed (i.e. micropyle) |
| Synergids | Degenerate |
| Antipodals | Degenerate |
APPEARS IN
RELATED QUESTIONS
Double fertilization is reported in plants of both, castor and groundnut. However, the mature seeds of groundnut are non-albuminous and castor are albuminous. Explain the post fertilization events that are responsible for it.
Triple Fusion involves:
(i) Fusion of one male, gamete with female gamete
(ii) Fusion of tube nucleus with generative nvcleus
(iii) Fusion of two polar nuclei.
(iv) Fusion of second male gamete with two polar nuclei
Match the following
| I) | External fertilization | i) | pollen grain |
| II) | Androecium | ii) | anther wall |
|
III) |
Male gametophyte | iii) | algae |
| IV) | Primary parietal layer | iv) | stamens |
Assertion: Sporopollenin preserves pollen in fossil deposits
Reason: Sporopollenin is resistant to physical and biological decomposition
Name the cell which divides to form male nuclei.
What is polyembryony? How it can commercially exploited.
From the following identify the fate of the male gametes discharged in the synergid.
In a breeding experiment, the selected male parent is diploid and the female parent is tetraploid. What will be the ploidy level of the endosperm that will develop after double fertilisation?
Double fertilization is fusion of ______.
Double fertilisation was first discovered in 1898 by ______ in Fritillaria and Lilium.
