A group of animals which are related by descent and share many similarities are referred to as

1. breed

2. race

3. variety

4. species

Inbreeding is carried out in animal husbandry because it

1. increases vigour

2. improves the breed

3. increases heterozygosity

4. increases homozygosity

Sonalika and Kalyan Sona are varieties of

1. wheat

2. rice

3. millet

4. tobacco

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

Several South Indian states raise 2-3 crops of rice annually. The agronomic feature that makes this possible is because of

1. shorter rice plant

2. better irrigation facilities

3. early yielding rice variety

4. disease-resistant rice variety

Which one of the following combinations would a sugarcane farmer look for in the sugarcane crop?

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

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

The biggest constraint of plant breeding is

Lysine and tryptophan are

1. proteins

2. non-essential amino acids

3. essential amino acids

4. aromatic amino