Inbreeding is carried out in animal husbandry because it:

1. increases vigour 2. improves the breed
3. increases heterozygosity 4. increases homozygosity

Subtopic:  Animal Husbandry (OLD NCERT) |
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Sonalika and Kalyan Sona are varieties of:

1. wheat 2. rice
3. millet 4. tobacco
Subtopic:  Plant Breeding & Its Steps (OLD NCERT) | Impact: Green Revolution (OLD NCERT) |
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Which one of the following is not a fungal disease?

1. Rust of wheat 2. Smut of Bajra
3. Black rot of crucifers 4. Red rot of sugarcane
Subtopic:  Impact: Green Revolution (OLD NCERT) | Insect & Pest Resistance (OLD NCERT) |
 66%
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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).

Subtopic:  Impact: Green Revolution (OLD NCERT) | Insect & Pest Resistance (OLD NCERT) |
 66%
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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.

Subtopic:  Plant Breeding for Quality (OLD NCERT) |
 82%
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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.

Subtopic:  Plant Breeding for Quality (OLD NCERT) |
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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.

Subtopic:  Plant Breeding for Quality (OLD NCERT) |
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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

Subtopic:  Plant Tissue Culture |
 93%
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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)
Subtopic:  Plant Breeding for Quality (OLD NCERT) |
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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.

Subtopic:  Plant Breeding for Quality (OLD NCERT) |
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