GPB MCQ Quiz 171 for ICAR JRF/SRF/ARS Exam Preparation

Modified form of bulk method is

A) Bulk method

B) SSD method

C) Mass selection

D) Pedigree selection

Explanation: SSD (Single Seed Descent) is a modified form of the bulk method used in plant breeding.

Which of the following methods takes longer time for varietal development?

A) Mass selection

B) Pedigree method

C) Bulk method

D) Back cross method

Explanation: Bulk method usually takes longer for varietal development due to natural selection over generations.

In pedigree breeding after F8, homozygous plants are known as

A) Variety

B) Genotype

C) Strain

D) Segregants

Explanation: After F8, homozygous plants obtained in pedigree breeding are referred to as strains.

A cross between an inbred line and an open pollinated variety is known as

A) Back cross

B) Top cross

C) Test cross

D) Wide cross

Explanation: A cross between an inbred line and an open pollinated variety is termed a top cross.

A cross between two inbred lines is called

A) Poly cross

B) Test cross

C) Single cross

D) Top cross

Explanation: The cross between two inbred lines is called a single cross hybrid.

Inbreeding depression is maximum in

A) Self-pollinated crops

B) Cross-pollinated crops

C) Often cross-pollinated crops

D) Both A and B

Explanation: Inbreeding depression is most severe in cross-pollinated crops due to breakdown of heterozygosity.

The term heterosis was first used by

A) Bruce (1908)

B) Shull (1914)

C) Jones (1917)

D) Hull (1945)

Explanation: The term heterosis was first coined by G.H. Shull in 1914.

The method applicable in both self- and cross-pollinated crops is

A) SSD

B) Heterosis breeding

C) Pedigree selection

D) Synthetic varieties

Explanation: Heterosis breeding is applicable to both self- and cross-pollinated crops.

Which variance is associated with heterosis?

A) GCA

B) SCA

C) Both GCA and SCA

D) None

Explanation: Specific Combining Ability (SCA) variance is mainly associated with heterosis.

Which estimates of heterosis is of commercial or practical value?

A) Relative heterosis

B) Heterobeltiosis

C) Economic heterosis

D) Luxuriance

Explanation: Economic heterosis is of practical value as it reflects commercial yield superiority.

The hybrid is superior to the mid-parent value is called

A) Reduced heterosis

B) Standard heterosis

C) Heterobeltiosis

D) Relative heterosis

Explanation: Relative heterosis is when a hybrid is superior to the mid-parent value.

The hybrid GCH-7 of castor belongs to which type of hybrid?

A) Single cross

B) Double cross

C) Poly cross

D) Three way cross

Explanation: Castor hybrid GCH-7 is a single cross hybrid.

The hybrid superior to better parent value is called

A) Heterobeltiosis

B) Standard heterosis

C) Reduced heterosis

D) Relative heterosis

Explanation: Heterobeltiosis is the superiority of hybrid over the better parent.

If 10 inbreds are crossed in all possible combinations, then total number of direct cross will be?

A) 45

B) 90

C) 55

D) 105

Explanation: The number of direct crosses possible with 10 inbreds is 10C2 = 45.

Which of the following are genetic causes of heterosis?

A) Dominance

B) Epistasis

C) Over-dominance

D) All of these

Explanation: Dominance, epistasis, and over-dominance are all genetic causes of heterosis.

Report Card

Total Questions Attempted: 0

Correct Answers: 0

Wrong Answers: 0

Percentage: 0%