Q. No.Which one of the following in & generates new genetic combinations leading to variation?
1. Nucellar polyembryony
2. Vegetative reproduction
3. Parthenogenesis
4. Sexual reproduction
1. Nucellar polyembryony
2. Vegetative reproduction
3. Parthenogenesis
4. Sexual reproduction
Match Column-I with Column-II and select the correct option using the codes given bel
Column-I Column-II
a. Pistils fused together (i) Gametogenesis
b. Formation of gametes (ii) Pistillate
c. Hyphae of higher Ascomycetes (iii) Syncarpous
d. Unisexual female flower (iv) Dikaryotic
Codes:
a b c d
1. (iii) (i) (iv) (ii)
2. (iv) (iii) (i) (ii)
3. (ii) (i) (iv) (iii)
4. (i) (ii) (iv) (iii)
In majority of angiosperms:
| 1. | a small central cell is present in the embryo sac |
| 2. | egg has a filiform apparatus |
| 3. | there are numerous antipodal cells |
| 4. | reduction division occurs in the megaspore mother cells |
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Pollination in water hyacinth and water lily is brought about by the agency of
1. bats
2. water
3. insects or wind
4. birds
The ovule of an angiosperm is technically equivalent to
1. megaspore
2. megasporangium
3. megasporophyll
4. megaspore mother cell
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Flowers that have a single ovule in the ovary and are packed into inflorescence are usually pollinated by:
| 1. | Water | 2. | Bee |
| 3. | Wind | 4. | Bat |
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A dioecious flowering plant prevents both:
| 1. | Autogamy and xenogamy |
| 2. | Autogamy and geitonogamy |
| 3. | Geitonogamy and xenogamy |
| 4. | Cleistogamy and xenogamy |
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Attractants and rewards are required for:
1. Anemophily
2. Entomophily
3. Hydrophily
4. Cleistogamy
Cultivation of flowering and ornamental plants for gardens and for commerce and trade is called:
| 1. | Horticulture | 2. | Plant breeding |
| 3. | Floriculture | 4. | Micropropagation |
Tapetum :
| I. | Is a layer of nutritive cells that are found within the microsporangium. |
| II. | The cells are usually bigger and normally have more than one nucleus per cell because mitosis is not normal in them. |
| III. | Helps in pollen wall formation, transportation of nutrients to the inner side of the anther, synthesis of callose enzyme for separation of microspore tetrads. |
Of the above statements, the correct ones are:
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II, and III |
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