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प्रश्न
What is the bagging technique?
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उत्तर
Various artificial hybridization techniques (under various crop improvement programmes) involve the removal of the anther from bisexual flowers without affecting the female reproductive part (pistil) through the process of emasculation. Then, these emasculated flowers are wrapped in bags to prevent pollination by unwanted pollen grains. This process is called bagging.
APPEARS IN
संबंधित प्रश्न
Lever mechanism of pollination is observed in
- Salvia
- Jasmine
- Bougainvillea
- Butea
What are chasmogamous flowers?
Mention two strategies that evolved to prevent self-pollination in flowers.
What is meant by emasculation?
Give the floral adaptations for anemophily.
The transfer of pollen grains from the anther to the stigma of the same or of another flower of the same kind is known as ______.
Draw a diagram of a section of a megasporangium of an angiosperm and label funiculus, Micropyle, embryosac and nuclleus.
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.
Fill in the blanks with suitable words.
_______ is a water-pollinated flower.
Answer the following question.
Write the difference in the characteristics of the progeny produced as a result of the two processes.
- Nucellus
- Antipodals
- Synergids
- Micropyle
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 different adaptations shown by bird-pollinated flowers?
Give an account of various abiotic agencies used in pollination along with their adaptations for pollination.
A particular species of plant produces light, non-sticky pollen in large numbers and its stigmas are long and feathery. These modifications facilitate pollination by ______.
Chief pollinators of agricultural crops are ______.
Even in absence of pollinating agents seed-setting is assured in ______.
Heterostyly as a contrivance for cross-pollination is found in ______.
Insect pollinated flowers are ______.
Which one of the following may require pollinators, but is genetically similar to autogamy?
Advantage of cleistogamy is:
Autogamy can occur in a chasmogamous flower if ______.
From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
Which of the following floral adapation are adapted by hydrophilous flowers?
Name the following:
One plant each of Hypohydrophily and epihydrophily.
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:
Hydrophily (Hypo) is characterized by which of the following conditions?
Which type of pollination involves the transfer of pollen between different plants of the same species?
