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प्रश्न
Write two ways in which pollination may occur in plants.
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उत्तर
The two ways in which pollination may occur in plants are:
(a) Self-pollination.
(b) Cross-pollination
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संबंधित प्रश्न
Geitonogamous flowering plants are genetically autogamous but functionally cross-pollinated. Justify.
A flower of tomato plant following the process of sexual reproduction produces 240 viable seeds.
Answer the following questions giving reasons :
(a) What is the minimum number of pollen grains that must have been involved in the pollination of its pistil?
(b) What would have been the minimum number of ovules present in the ovary?
(c) How many megaspore mother cells were involved?
(d) What is the minimum number of microspore mother cells involved in the above case?
(e) How many male gametes were involved in this case?
Which one of the following is one of the characteristics of self-pollinated flowers?
Answer the following question.
Write the difference in the characteristics of the progeny produced as a result of the two processes.
Put a tick mark (✓) against the correct alternative in the following statements
Vegetative propagation is not observed in:
The flower which possesses both androecium and gynoecium is called perfect or ______.
Insect pollinated flowers are ______.
Which one of these statements is incorrect?
The following statements seem to describe the water-pollinated submerged plants.
Complete the following table:
| Sr. | Type of pollination | Agent | Kind of flower | Examples |
| (i) | ______ | Wind | ______ | Maize |
| (ii) | Chiropterophily | ______ | Dull colour, with strong fragrance, abundant nectar | Adansonia |
| (iii) | Entamophily | Insects | ______ | Rose/Jasmine |
| (iv) | Ornithophily | ______ | Brightly coloured, large and showy. They secrete profuse, dilute n ectar | ______ |
Identify the set of correct statements:
- The flowers of Vallisneria are colourful and produce nectar.
- The flowers of waterlily are not pollinated by water.
- In most of water-pollinated species, the pollen grains are protected from wetting.
- Pollen grains of some hydrophytes are long and ribbon like.
- In some hydrophytes, the pollen grains are carried passively inside water.
Choose the correct answer from the options given below:
