GPB MCQ Quiz 173 for ICAR JRF/SRF/ARS Exam Preparation

1. Mating between closely related individuals is known as

A) Hybridization

B) Inbreeding

C) Heterosis

D) Standard heterosis

Explanation: Inbreeding refers to mating between closely related individuals.

2. The magnitude of heterosis is associated with

A) Homozygosity

B) Heterogeneous

C) Homogeneous

D) Heterozygosity

Explanation: Heterosis is directly related to heterozygosity.

3. Heterobeltiosis can be computed by mean value of the following formula:

A) F1 – F2 / F1 × 100

B) F1 – BP / BP × 100

C) BP – F1 / BP × 100

D) MP – F1 / F1 × 100

Explanation: Heterobeltiosis is calculated as (F1 – BP)/BP × 100.

4. The formula F1 – SC / SC × 100 can be used to compute which of the following?

A) Standard heterosis

B) Heterobeltiosis

C) Relative heterosis

D) Inbreeding depression

Explanation: Standard heterosis is measured by (F1 – SC)/SC × 100.

5. Inbreeding depression is very less in case of

A) Self-pollinated crops

B) Cross-pollinated crops

C) Often cross-pollinated crops

D) Both A and B

Explanation: Self-pollinated crops already undergo natural inbreeding, so depression is minimal.

6. Who is known as the father of hybrid rice?

A) Harlen

B) G.W. Burton

C) E.E. Hartwig

D) Y.L. Ping

Explanation: Yuan Longping (Y.L. Ping) is regarded as the father of hybrid rice.

7. Diallel selective mating system is used for genetic improvement among which crop?

A) Cross-pollinated

B) Often cross-pollinated

C) Self-pollinated

D) Vegetatively propagated crop

Explanation: Diallel selective mating system is mainly used for self-pollinated crops.

8. Method used for population improvement is

A) Pedigree

B) Recurrent selection

C) Bulk

D) SSD

Explanation: Recurrent selection is widely used for population improvement.

9. Which of the following methods is not appropriate for population improvement?

A) Pureline selection

B) Recurrent selection

C) Biparental mating

D) Disruptive selection

Explanation: Pureline selection reduces variability and is not used for population improvement.

10. A population in which each individual plant has equal chance of mating with other individuals of that population is called

A) Random mating population

B) Panmictic population

C) Mendelian population

D) All of these

Explanation: All the terms describe populations where random mating occurs.

11. A fundamental law of population genetics was developed by

A) Hardy & Fisher

B) Weinberg & Flor

C) Hardy & Weinberg

D) Hardy & Mather

Explanation: The Hardy–Weinberg law is fundamental to population genetics.

12. Which of the following evolutionary forces change gene frequency?

A) Mutation, Migration, Selection and Genetic drift

B) Mutation, Selection and Genetic drift

C) Migration, Mutation and Genetic drift

D) Selection, Genetic drift and Mutation

Explanation: Mutation, migration, selection and genetic drift all affect gene frequencies.

13. Repeated selection generation to generation, simultaneously intermating of selected plants to provide genetic recombination is known as

A) Disruptive selection

B) Recurrent selection

C) Biparental selection

D) Progeny selection

Explanation: Recurrent selection involves repeated selection and intermating to accumulate favorable alleles.

14. Recurrent selection is more commonly used in

A) Autogamous species

B) Often self-pollinated crops

C) Allogamous species

D) Often cross-pollinated crops

Explanation: Recurrent selection is mainly suited for cross-pollinated (allogamous) species.

15. Which of the following is base material for recurrent selection?

A) Open pollinated variety

B) Pureline

C) Self-pollinated variety

D) Wild species

Explanation: Open pollinated varieties are generally used as base populations in recurrent selection.

16. Which of the following is/are basic assumptions of recurrent selection?

A) Absence of epistasis

B) Absence of multiple alleles

C) Absence of linkage disequilibrium

D) All of these

Explanation: Assumptions include absence of epistasis, multiple alleles, and linkage disequilibrium.

17. In case of simple recurrent selection, selection is made on the basis of

A) Phenotype

B) Progeny

C) Genotype

D) Yield

Explanation: Simple recurrent selection is based on phenotypic performance of plants.

18. Recurrent selection in which heterozygous tester is used is

A) Simple recurrent selection

B) Recurrent selection for SCA

C) Recurrent selection for GCA

D) Reciprocal recurrent selection

Explanation: Recurrent selection for GCA employs heterozygous testers.

19. Recurrent selection in which homozygous tester is used is

A) Simple recurrent selection

B) Recurrent selection for SCA

C) Recurrent selection for GCA

D) Reciprocal recurrent selection

Explanation: Recurrent selection for SCA uses homozygous testers to identify specific combining ability.

20. End product of recurrent selection is

A) Top cross

B) Clone

C) Pureline

D) Inbred

Explanation: Recurrent selection ultimately develops inbred lines.

21. Among the following, which is the efficient breeding method used for breaking undesirable linkages?

A) Pedigree method

B) Disruptive selection

C) Pureline selection

D) SSD method

Explanation: Disruptive selection helps break undesirable linkages by selecting extreme genotypes.

22. Yield prediction and reconstitution is possible in case of

A) Hybrid variety

B) Composite variety

C) Synthetic variety

D) Pureline variety

Explanation: Synthetic varieties allow yield prediction and can be reconstituted from parental lines.

23. Synthetic and composite varieties are mostly relevant to

A) Self-pollinated

B) Cross-pollinated

C) Both self- and cross-pollinated

D) None of these

Explanation: These varieties are suited for cross-pollinated crops.

24. Base material used to produce synthetic varieties are

A) Open pollinated variety

B) Inbred

C) Clones

D) All of these

Explanation: Synthetic varieties can be formed from inbreds, open-pollinated varieties, or clones.

25. A variety which is produced by crossing between a number of lines in all possible combinations which combine well with each other is known as

A) Composite variety

B) Germplasm complexes

C) Synthetic variety

D) All of these

Explanation: Synthetic varieties are developed by crossing lines in all combinations that combine well.

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