Advertisements
Advertisements
प्रश्न
What is the bagging technique?
Advertisements
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
As a senior biology student you have been asked to demonstrate to the students of secondary level in your school, the procedure(s) that shall ensure cross-pollination in a hermaphrodite flower. List the different steps that you would suggest and provide reasons for each one of them.
Explain the post-pollination events leading to seed production in angiosperms.
A flower of tomato plant following the process of sexual reproduction produces 200 viable seeds.
Answer the following questions giving reasons :
(a) What would have been the minimum number of ovules present in pre-pollinated pistil ?
(b) How many microscope mother cells would minimally be required to produce requisite number of pollen grains ?
(c) How many pollen grains must have minimally pollinated the carple ?
(d) How many male gametes would have used to produce these 200 viable seeds ?
(e) How many megaspore mother cells were required in this process ?
Enlist advantages and disadvantages of cross pollination
Describe the structure of its microsporangium.
Write two ways in which pollination may occur in plants.
Find the odd-one out, giving reason:
Ovary, style, pollen grain, stigma
Give one word/term for the following:
When stigma and anthers do not grow up to the same height, which favors only cross-pollination.
Mention any two contrivances in flowers which favour cross-pollination.
State four features of flowers pollinated by insects.
Differentiate between geitonogamy and xenogamy (allogamy).
Put a tick mark (✓) against the correct alternative in the following statements
Pollen is produced in the
Put a tick mark (✓) against the correct alternative in the following statements
Vegetative propagation is not observed in:
Give an account of various abiotic agencies used in pollination along with their adaptations for pollination.
Cleistogamous flowers are ______.
Pollination occurs in ______.
Anemophily type of pollination is found in ______.
Feathery stigma occurs in ______.
In some plants anther and stigma mature at the same time this condition is called ______.
Insect pollinated flowers are ______.
Which type of flower has ovary superior?
In the dioecious aquatic plant shown, identify the characteristics of the male flowers that reach the female flowers for pollination:
| Size of the flower | Colour of flower | The characteristic feature of pollen grain | |
| A | small | brightly coloured | Lightweight and non-sticky |
| B | large | colourless | large and sticky |
| C | small | white | small, covered with mucilage |
| D | large | colourless | non-sticky |
What is self-incompatibility?
Consider the following statements depicting adaptation of flowers to carryout successful pollination.
- Stigma is long, sticky and unwettable.
- Sepals, petals or perianth (if present) have waxy coating.
- Stamens with long filament and versatile anthers.
- Tubular corolla is seen.
- Flowers are noctumal.
Which of the above statements clearly depict hydrophily?
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 |
Pollination in water lilies is carried out by ______.
Give any four floral adaptations for chiropterophily.
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 | ______ |
When and why does a plant breeder employ the emasculation technique?
