The central cell in the embryo sac, after triple fusion, becomes:
(1) Primary endosperm cell
(2) Endosperm
(3) Embryo
(4) Zygote
What would be the number of chromosomes in the cells of the aleurone layer in a plant species with 8 chromosomes in it synergids ?
(1) 16
(2) 24
(3) 32
(4) 8
Double fertilization involves
(1) fertilization of the egg by two male gametes
(2) fertilization of two eggs in the same embryo sac by two sperms brought by one pollen tube
(3) fertilization of the egg and the central cell by two sperms brought by different pollen tubes
(4) fertilization of the egg and the central cell by two sperms brought by the same pollen tube.
After double fertilizaton, a mature ovule has
(1) 1 diploid and 1 haploid cell
(2) 1 diploid and 1 triploid cell
(3) 2 haploid and 1 triploid cell
(4) 1 haploid and 1 triploid cell
In double fertilization total number of male nuclei and total number of female nuclei involved are:
(1) 3, 2 respectively
(2) 2, 3 respectively
(3) 2, 2 respectively
(4) 3, 3 respectively
| 1. | Fusion of two male gametes of a pollen tube with two different eggs |
| 2. | Fusion of one male gamete with two polar nuclei |
| 3. | Fusion of two male gametes with one egg |
| 4. | Syngamy and triple fusion |
| I. | Tapetum nourishes the developing pollen grains. |
| II. | Hilum represents the junction between the ovule and the funicle. |
| III. | In aquatic plants such as water hyacinths and water lily, pollination is by water. |
| IV. | The primary endosperm nucleus is triploid. |
1. I, II, and IV are correct, but Ill is incorrect
2. I and II are correct, but Ill and IV are incorrect
3. I and IV are correct, but II and Ill are incorrect
4. I, Ill and IV are correct, but I is incorrect
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