Q. No.Which of the following statements is not correct?
1. Some reptiles have also been reported as pollinators in some plant species. ,
2. Pollen grains of many species can germinate on the stigma of a flower, but only one pollen tube of the same
species grows into the style.
3. Insects that consume pollen or nectar without bringing about pollination are called pollen/ nectar robbers.
4. Pollen germination and pollen tube growth are regulated by chemical components of pollen interacting with
those of the pistil
1. Some reptiles have also been reported as pollinators in some plant species. ,
2. Pollen grains of many species can germinate on the stigma of a flower, but only one pollen tube of the same
species grows into the style.
3. Insects that consume pollen or nectar without bringing about pollination are called pollen/ nectar robbers.
4. Pollen germination and pollen tube growth are regulated by chemical components of pollen interacting with
those of the pistil
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Seed formation without fertilization in flowering plants involves the process of:
1. Apomixis
2. Sporulation
3. Budding
4. Somatic hybridization
Which one of the following statements is not true?
| 1. | Stored pollen in liquid nitrogen can be used in the crop breeding programmes. |
| 2. | Tapetum helps in the dehiscence of anther. |
| 3. | Exine of pollen grains is made up of sporopollenin. |
| 4. | Pollen grains of many species cause severe allergies. |
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Which one of the following in & generates new genetic combinations leading to variation?
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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