Plants can be made disease resistant through

1. Colchicine treatment

2. X-ray treatment

3. Hormone treatment

4. Breeding with wild relatives

In wheat, stem sawfly unable to cause destruction of crop due to

1. Low nitrogen and sugar content
2. Hollow stem
3. Solid stem
4. Nectarless flowers

Find the correct match with respect to crop variety for their disease resistant 

   Column I                       Column II

(a) Pusa Komal                (i) Tobaccor mosaic virus

(b) Pusa Sadabahar         (ii) Black rot

(c) Pusa Shubhra             (iii) White rust

(d) Pusa Swarnim             (iv) Bacterial Blight

1. a(iv), b(i), c(ii), d(iii)
2. a(iv), b(i), c(iii), d(ii)
3. a(i), b(iv), c(ii), d(iii)
4. a(ii), b(iii), c(iv), d(i)

Which of the following in not the objective of bio fortification :-

1. Improvement of protein content and quality.
2. Increase oil content & quality
3. Reduction in micro nutrient and mineral content.
4. Improvement of vitamin content.

Atlas 66 is a variety of :-

1. Wheat

2. Bhindi

3. Rice

4. Sugar cane

Somaclones are produced by

1. Micropropagation.

2. Mutation.

3. Polyploidy.

4. Hybridisation.

Read the following statement and select the right choice

a. Semi-dwarf varieties, Jaya and Ratna were developed in IRRI, Phillippines.
b. Classical plant breeding involves crossing or hybridization of pure lines.
c. Saccharum barberi was originally grown in South India.
d. Genetic variability is the root of any breeding programme.

1. Only a is correct.

2. b and d are correct.

3. a, b and c are correct.

4. b, c and d are correct.

In maize, which of the following leads to resistance to maize stem borers?

1.  High aspartic acid and low sugar content.

2.  Solid stem and smooth leaves.

3.  Nectarless flowers.

4.  Solid stem and high sugar contents.

Genetically identical plants produced by micropropagation are called

1.  Explants

2.  Somaclones

3.  Somatic hybrids

4.  Cybrids

Study the following statements find the incorrect match.

1. Wild relatives are used in plant breeding.

2. Production of single cell protein is useful in reducing environmental pollution.

3. Somaclones are different from source of explant.

4. Maize hybrid have twice amount of amino acid lysine & tryptophan.