Advertisements
Advertisements
प्रश्न
When and why does a plant breeder employ the emasculation technique?
Advertisements
उत्तर
Plant breeders employed this technique to prevent pollination within the same flower or to pollinate stigmas with pollen of the desired variety. To remove the anthers, the flowers are covered with a bag before they open. This ensures that the flower is pollinated by pollen grains obtained from desirable varieties only. Later, the mature, viable, and stored pollen grains are dusted on the bagged stigma by breeders to allow artificial pollination to take place and obtain the desired plant variety.
APPEARS IN
संबंधित प्रश्न
Explain the post-pollination events leading to seed production in angiosperms.
Name the part of the flower which the tassels of the corn- cob represent.
Why angiosperm anthers are called dithecous?
Why does self-pollination not lead to seed formation in self-incompatible species?
Add a note on pollination mechanism in Salvia.
Write two ways in which pollination may occur in plants.
Name two characteristics of flowers in which pollination occur by wind.
Complete the following chart and rewrite.
| Sr.No. | Agencies | type of pollination |
| 1 | Water | .................... |
| 2 | ........................... | Entomophily |
| 3 | Bat | .................... |
| 4 | ....................... | Ornithophily |
(Or)
Explain outbreeding devices in angiospermic plants.
Which one of the following is one of the characteristics of self-pollinated flowers?
Fill in the blanks with suitable words.
_______ is a water-pollinated flower.
Give one word/term for the following:
Pollination of flowers by insects.
Put a tick mark (✓) against the correct alternative in the following statements
Pollen is produced in the
Differentiate Between Cross Pollination and Self Pollination:
What are the adaptations which are required in self-pollinated plants?
Mention various adaptations for wind pollination.
Both chasmogamous and cleistogamous flowers are present in ______.
Even in absence of pollinating agents seed-setting is assured in ______.
Male and female flowers are present on different plants (dioecious) to ensure xenogamy, in ______.
Feathery stigma occurs in ______.
Pollination refers to the ______.
Which one of the following may require pollinators, but is genetically similar to autogamy?
The term used for transfer of pollen grains from anthers of one plant to stigma of a different plant which, during pollination, brings genetically different types of pollen grains to stigma, is ______
Describe any three adaptations in anemophilous flowers.
Match the Column I with Column II.
| Column I | Column II |
| A. Pea | (i) Xenogamy |
| B. Jawar | (ii) Epihydrophily |
| C. Maize | (iii) Anemophily |
| D. Vallis | (iv) Bisexual |
| E. Cannabis | (v) Geitonogamy |
Name the following:
Aquatic plants which are anemophilous.
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 | ______ |
Which one of the following flower is hypohydrophilous?
Bird pollinated flowers are usually ______.
