Q. No.In virus-infected plants, the meristematic tissues in both apical and axillary buds are free of the virus because:
1.
the dividing cells are virus resistant.
2.
meristems have anti-viral compounds.
3.
the cell division of meristems is faster than the rate of viral multiplication.
4.
Viruses cannot multiply within meristem cell(s).
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Fungicides and antibiotics are chemicals that:
| 1. | enhance yield and disease resistance. |
| 2. | kill pathogenic fungi and bacteria, respectively. |
| 3. | kill all pathogenic microbes. |
| 4. | kill pathogenic bacteria and fungi, respectively. |
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Use of certain chemicals and radiation to change the base sequences of genes of crop plants is termed:
1. recombinant DNA technology
2. transgenic mechanism
3. mutation breeding
4. gene therapy.
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The scientific process by which crop plants are enriched with certain desirable nutrients is called:
1. crop protection
2. breeding
3. bio-fortification
4. bio-remediation.
The term ‘totipotency’ refers to the capacity of a:
1. cell to generate the whole plant
2. bud to generate the whole plant
3. seed to germinate
4. cell to enlarge in size
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Given below are a few statements regarding somatic hybridization. Choose the correct statements:
| (i) | protoplasts of different cells of the same plant are fused. |
| (ii) | protoplasts from cells of different species can be fused. |
| (iii) | treatment of cells with cellulase and pectinase is mandatory. |
| (iv) | the hybrid protoplast contains characters of only one parental protoplast. |
| 1. | (i) and (iii) | 2. | (i) and (ii) |
| 3. | (i) and (iv) | 4. | (ii) and (iii) |
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An explant is a :
1. dead plant
2. part of the plant
3. part of the plant used in tissue culture
4. part of the plant that expresses a specific gene.
The biggest constraint of plant breeding is:
1. availability of desirable gene in the crop and its wild relatives
2. infrastructure
3. trained manpower
4. transfer of genes from unrelated sources.
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Lysine and tryptophan are:
1. proteins
2. non-essential amino acids
3. essential amino acids
4. aromatic amino acids.
Micro-propagation is:
1. propagation of microbes in vitro
2. propagation of plants in vitro
3. propagation of cells in vitro
4. growing plants on a smaller scale
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