ICSE Class 9 Biology
Question 1 of 12
Pollination and Fertilization — Question 1
Back to all questions(a) Difference between Autogamy and Geitonogamy:
| Autogamy | Geitonogamy |
|---|---|
| It refers to transfer of pollen grain from anther to stigma of the same flower. | It refers to transfer of pollen grain from anther of one flower to stigma of another flower of the same plant. |
(b) Difference between Homogamy and Dichogamy:
| Homogamy | Dichogamy |
|---|---|
| Maturity of anther and stigma of a flower at same time to ensure self pollination. | Maturity of anther and stigma of a flower at different times to ensure cross pollination. |
(c) Difference between Protandry and Protogyny:
| Protandry | Protogyny |
|---|---|
| Anthers of the flower matures earlier than the stigma. | Stigma of the flower matures earlier than the anthers. |
(d) Difference between Entomophilous and Anemophilous flowers:
| Entomophilous flowers | Anemophilous flowers |
|---|---|
| Flowers that are pollinated by insects are called entomophilous flowers. | Flowers that are pollinated by winds are called anemophilous flowers. |
| Flowers are showy. | Flowers are not showy. |
| Pollen is produced in limited amount. | Very large quantity of pollen is produced. |
| Pollen grains are sticky or spiny. | Pollen grains are light dry and smooth. |
(e) Difference between advantages of self and cross-pollination:
| Advantages of Self-pollination | Advantages of Cross-pollination |
|---|---|
| Parental characters are preserved indefinitely. | There are variations in character leading to production of new varieties. |
| It is much surer in bisexual flowers where stamens and carpels mature at the same time. | The seeds produced are abundant and viable. |
| There is no wastage of pollen grains. | Offsprings are healthier and can adapt to environmental changes. |