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CBSE - Class 12 Biology Strategies for Enhancement in Food Production Worksheet

MULTIPLE-CHOICE QUESTIONS

A collection of all the alleles of all the genes of a crop plant is called:

a. germplasm collection b. protoplasm collection c. herbarium d. somaclonal collection.

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.

a. (i) and (iii) b. (i) and (ii) c. (i) and (iv) d. (ii) and (iii)

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

a. shorter rice plant b. better irrigation facilities c. early yielding rice variety d. disease resistant rice variety.

33 percent of India’s Gross Domestic Product comes from

a. Industry b. Agriculture c. Export d. Small-scale cottage industries.

Lysine and tryptophan are:

a. proteins b. non-essential amino acids c. essential amino acids d. aromatic amino acids.

Inbreeding is carried out in animal husbandry because it:

a. increases vigour b. improves the breed c. increases heterozygosity d. increases homozygosity

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

a. breed b. race c. variety d. species

Which one of the following is not a fungal disease?

a. Rust of wheat b. Smut of Bajra c. Black rot of crucifers d. Red rot of sugarcane

The scientific process by which crop plants are enriched with certain desirable nutrients is called:

a. crop protection b. breeding c. bio-fortification d. bio-remediation.

10.

Use of certain chemicals and radiation to change the base sequences of genes of crop plants is termed:

a. recombinant DNA technology b. transgenic mechanism c. mutation breeding d. gene therapy.

11.

Sonalika and Kalyan Sona are varieties of:

a. wheat b. rice c. millet d. tobacco

12.

The agriculture sector of India employs about:

a. 50 per cent of the population b. 70 per cent of the population c. 30 per cent of the population d. 60 per cent of the population.

13.

The biggest constraint of plant breeding is:

a. availability of desirable gene in the crop and its wild relatives b. infrastructure c. trained manpower d. transfer of genes from unrelated sources.

14.

An explant is:

a. dead plant b. part of the plant c. part of the plant used in tissue culture d. part of the plant that expresses a specific gene.

15.

Micro-propagation is:

a. propagation of microbes in vitro b. propagation of plants in vitro c. propagation of cells in vitro d. growing plants on smaller scale.

16.

The chances of contacting bird flu from a properly cooked (above 100°C) chicken and egg are:

a. very high b. high c. moderate d. negligible

17.

To isolate protoplast, one needs:

a. pectinase b. cellulase c. both pectinase and cellulase d. chitinase.

18.

Fungicides and antibiotics are chemicals that:

a. enhance yield and disease resistance b. kill pathogenic fungi and bacteria, respectively c. kill all pathogenic microbes d. kill pathogenic bacteria and fungi respectively.

19.

Protoplast is:

a. another name for protoplasm b. an animal cell c. a plant cell without a cell wall d. a plant cell.

20.

In virus-infected plants the meristematic tissues in both apical and axillary buds are free of virus because:

a. the dividing cells are virus resistant b. meristems have anti viral compounds c. the cell division of meristems are faster than the rate of viral multiplication d. Viruses cannot multiply within meristem cell (s).

Worksheet Answers

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