Unisexuality of flowers prevents
1. Getionogamy but not xenogamy
2. Autogamy and geitonogamy
3. Autogamy but not geitonogamy
4. Both getionogamy and xenogamy
Which one of the following is resistant to enzyme action
1. Pollen exine
2. Leaf cuticle
3. Cork
4. Wood fibre
Apomictic embryos in citrus arise from
1. Maternal sporophytic tissue in ovule
2. Antipodal cells
3. Diploid egg
4. Synergids
Wind pollinated flowers are
1. Small, producing large number of dry pollen grains
2. large producing abundant nectar and pollen
3. Small, producing nectar and dry pollen
4. Small, brightly coloured, producing large number of pollen grains
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Transfer of pollen grains from the anther to the stigma of another flower of the same plant is called
1. Geitonogamy
2. Karyogamy
3. Autogamy
4. Xenogamy
Wind pollination is common in:
1. Legumes
2. Lilies
3. Grasses
4. Orchids
Both, autogamy and geitonogamy are prevented in -
1. Papaya
2. Cucumber
3. Castor
4. Maize
Plants with ovaries having only one or a few ovules, are generally pollinated by:
1. Bees
2. Butterflies
3. Birds
4. Wind
Megasporangium is equivalent to :
1. Fruit
2. Nucellus
3. Ovule
4. Embryo sac
Which one of the following statements is correct?
1. Sporogenous tissue is haploid
2. Endothecium produces the microspores
3. Tapetum nourishes the developing pollen
4. Hard outer layer of pollen is called intine