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UnAttempted
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DIRECTIONS : Each questions contain STATEMENT-1 (Assertion) and STATEMENT-2 (Reason). Each question has 4 choices (a), (b), (c) and (d) out of which ONLY ONE is correct.
Statement 1 : Nuclear endosperm is formed by subsequent nuclear division without wall formation.
Statement 2 : Coconut is an example of such endosperm, where the endosperm remains nuclear throughout the development of the fruit.
In nuclear type of endosperm the division of the primary endosperm nucleus and a few subsequent nuclear division are not accompanied by wall formation. So numerous nuclei are freely suspended in its sap. In coconut, the primary endosperm nucleus undergoes a number of free nuclear divisions. When the fruit is about 50 mm long before the embryo sac gets filled with a clear fluid in which float numerous nuclei of various sizes. At a later stage (about 100 mm long fruit) the suspension shows in addition to free nuclei, several cells each enclosing variable number of nuclei. Gradually these cells and free nuclei start setting at the periphery of the cavity and layers of cellular endosperm start appearing. In mature coconuts the liquid endosperm becomes milky and it does not contain free nuclei or cell.
DIRECTIONS : Each questions contain STATEMENT-1 (Assertion) and STATEMENT-2 (Reason). Each question has 4 choices (a), (b), (c) and (d) out of which ONLY ONE is correct.
Statement 1 : The two cotyledons in seed are embryonic leaves.
Statement 2 : The embryo contains radicle and plumule.
In angiosperms, cotyledons are embryonic leaves. Embryo also has radicle and plumule which gives rise to root and shoot respectively.
Seeds are adaptively important because –
1. they maintain dormancy
2. they protect young plants during vulnerable stages
3. they store food for young plants, and facilitate dispersal
Match Column -I with Column – II.
| Column I | Column II |
|---|---|
| A. Ovary | 1. Groundnut, mustard |
| B. Ovule | 2. Guava, orange, mango |
| C. Wall of ovary | 3. Pericarp |
| D. Fleshy fruits | 4. Seed |
| E. Dry fruits | 5. Fruit |
Match Column -I with Column – II.
| Column I | Column II |
|---|---|
| A. Zoophily | 1. Pollination by birds |
| B. Ornithophily | 2. Pollination by insects |
| C. Entomophilly | 3. Pollination by bats |
| D. Chiropterophily | 4. Pollination by animals |