FREE NEET Biology Practice MCQ Test: Strategies For Enhancement In Food Production Exercise 2 Questions Answers With Detailed Explanations [PDF]

Answer: (b)

New world crops are those which have their center of origin as America. Cashewnut and rubber have their center of origin in Brazil and potato has Peru as its center of origin. All of them have been brought to India from New world.

Answer: (d)

Protoplast culture results in the production of somatic hybrid plants, an important technique of tissue culture.

Answer: (c)

Answer: (d)

'Himgiri' is a variety of wheat. HS-375 and HS375 are the two common varieties of Himgiri. HS375 is produced on irrigated/rain-fed area. It is medium fertility and late sown hybrid of Himgiri, while HS375 is produced on very high altitude i.e., in the Northern Himalayan and Garhwal region. 'Himgiri' is resistance to leaf and stripe rust and hill bunt diseases.

Answer: (d)

Answer: (d)

'Himgiri' developed by hybridisation and selection for disease resistance against rust pathogens is a variety of wheat. It is resistant to leaf/stripe rust and hill bunt.

Answer: (d)

Answer: (b)

Answer: (d)

Answer: (c)

Answer: (c)

Answer: (c)

Answer: (d)

When a hybrid is produced by fusion of somatic cells of two varieties or species, it is known as somatic hybrid. The process of producing somatic hybrids is called somatic hybridization. First, the cell wall of the plant cells are removed then the protoplasts of the two cells are brought in contact and made to fuse by means of electrofusion or chemicals like polyethylene glycol (PEG) and sodium nitrate. The fused protoplasts soon develop their own walls and are called somatic hybrids.

Answer: (d)

Answer: (a)

Vectors are DNA molecules that can carry a foreign DNA segment and replicate inside the host cell. They are used in recombinant DNA technology.

Answer: (a)

Genetic engineering is experimental manipulation of genetic material, especially for industrial or medical uses. It encompasses the techniques of gene cloning, the modification DNA by changes in sequence arrangement or deletion, and the introduction of novel genes into cells and organisms. It may prove possible to advantageously modify the genes of farmed animals, to correct genetic deficiencies of the human by inserting novel genes. This can be done by breakage of a DNA molecule at two desired places into another DNA molecule of the desired animal.

Answer: (c)

Answer: (b)

Haploids are preferred over diploids for mutation study because in haploids recessive mutation is easier. Most of the induced mutations are recessive and these have to be in double to be expressed phenotypically. Mutations are not seen in heterozygous conditions. So, in haploid plants, recessive mutation expresses immediately.

Answer: (b)

A group of animals that are related by descent and are similar in most characters like general appearance, features, size, configuration, etc. are referred as a breed. The other three options are incorrect because race is a classification system that is used to categorize humans into large and distinct populations or groups, which is based on anatomical, cultural, ethnic or geographical differences.

Whereas a variety is a genetically and morphologically distinct subset of a species that is geographically isolated from other populations within that species. A species is defined as a group of individuals that potentially interbreed in nature.

Answer: (c)