Flowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by:
1. | Bee | 2. | Wind |
3. | Bat | 4. | Water |
A dioecious flowering plant prevents both:
1. Autogamy and geitonogamy
2. Geitonogamy and xenogamy
3. Cleistogamy and xenogamy
4. Autogamy and xenogamy
Double fertilization is exhibited by:
1. Algae
2. Fungi
3. Angiosperms
4. Gymnosperms
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 crop breeding programs |
4. | Tapetum helps in the dehiscence of anther |
1. | connective | 2. | placenta |
3. | thalamus or petal | 4. | anther |
Which of the following statements is not correct?
1. | Insects that consume pollen or nectar without bringing about pollination are called pollen-nectar robbers. |
2. | Pollen germination and pollen tube growth are regulated by chemical compounds of pollen interacting with those of the pistil. |
3. | Some reptiles have also been reported as pollinators in some plant species. |
4. | 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. |
Filiform apparatus is a characteristic feature of?
1. Generative cell
2. nucellar embryo
3. aleurone cell
4. synergids