Scientists are trying to transfer apomictic genes into hybrid varieties of several of our food and vegetable crops so that:
1. They get resistance against common pathogens
2. The yield of these plants can be increased many folds
3. Hybrid seeds need not be produced every year
4. Their germplasm is easily stored in labs for further research
Which of the following is the most common abiotic pollinating agent?
1. | Insects | 2. | Birds and bats |
3. | Wind | 4. | Water |
The asexual production of seeds is called as:
1. Adventition
2. Fragmentation
3. Self-fertilization
4. Apomixis
The ovule of an angiosperm is technically equivalent to
1. megasporangium
2. megasporophyll
3. megaspore mother cell
4. megaspore
Which one of the following may require pollinators, but is genetically similar to autogamy?
(1) Geitonogamy
(2) Xenogamy
(3) Apogamy
(4) Cleistogamy
Functional megaspore in an angiosperm develops into
(1) ovule
(2) endosperm
(3) embryo sac
(4) embryo
The morphological nature of the edible part of coconut is
(1) perisperm
(2) cotyledon
(3) endosperm
(4) pericarp
In majority of angiosperms
(1) egg has a filiform apparatus
(2) there are numerous antipodal cells
(3) reduction division occurs in the megaspore mother cells
(4) a small central cell is present in the embryo sac
Pollination in water hyacinth and water lily is brought about by the agency of
(1) water
(2) insects or wind
(3) birds
(4) bats
Which one of the following statements is not true?
1. | Exine of pollen grains is made up of sporopollenin |
2. | Pollen grains of many species cause severe allergies |
3. | Stored pollen in liquid nitrogen can be used in the crop breeding programmes |
4. | Tapetum helps in the dehiscence of anther |