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प्रश्न
With the help of suitable diagram define 'bagging' and 'tagging' of flower.
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उत्तर
Bagging: During Hybridization, emasculated flowers are covered with butter paper or polythene bag of suitable size to prevent pollination by pollengrains of unwanted source. This is known as bagging.
Tagging: After dusting the pollengrains on stigma of emasculated flower, it is rebagged and tag with relevant information such as date of emasculation, date of pollination, details of male and female parents, etc is attached with plants. This is known as tagging.
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संबंधित प्रश्न
Give the names of ‘two’ insect-resistant crop varieties.
What is emasculation?
Describe the mass flow hypothesis for translocation of organic solutes (food) in plants.
Explain selective breeding. Give any 'two' examples and their nutrients obtained by selective breeding.
Use of certain chemicals and radiation to change the base sequences of genes of crop plants is termed ______.
Discuss the two main limitations of plant hybridization programme.
Define the term ‘stress’ for plants. Discuss briefly the two types of stress encountered by plants.
Give few examples of biofortified crops. What benefits do they offer to the society?
Mutations are beneficial for plant breeding. Taking an example, justify the statement.
Match the following:
| Sr. No. | Column I | Column II | |
| (i) | Eutrophication | (a) | A soil erosion |
| (ii) | Biomagnification | (b) | carbon monoxide, methane |
| (iii) | Particulate pollutant | (c) | Prevention of extinction |
| (iv) | Conservation | (d) | Dust, smog |
| (v) | Gaseous pollutants | (e) | Accumulation of nonbiodegradable substances |
| (vi) | Deforestation | (f) | Death of aquatic ecosystem |
