NEET > Biology and Human Welfare

Explore popular questions from Biology and Human Welfare for NEET. This collection covers Biology and Human Welfare previous year NEET questions hand picked by popular teachers.


Q 1.    

Correct4

Incorrect-1

Artificial selection to obtain cows yielding higher milk output represents

directional as it pushes the mean of the character in one direction

B

disruptive as it splits the population into two, one yielding higher output and the other lower output

C

stabilising followed by disruptive as it stabilises the population to produce higher yielding cows

D

stabilising selection as it stabilises this character in the population.

Explanation

Q 2.    

Correct4

Incorrect-1

Homozygous purelines in cattle can be obtained by

A

mating of unrelated individuals of same breed

B

mating of individuals of different breed

C

mating of individuals of different species

mating of related individuals of same breed.

Explanation


Q 3.    

Correct4

Incorrect-1

A true breeding plant is

A

one that is able to breed on its own

B

produced due to cross-pollination among unrelated plants

near homozygous and produces offspring of its own kind

D

always homozygous recessive in its genetic constitution.

Explanation

Q 4.    

Correct4

Incorrect-1

Interspecific hybridisation is the mating of

A

animals within same breed without having common ancestors

two different related species

C

superior males and females of different breeds

D

more closely related individuals within same breed for 4 - 6 generations.

Explanation


Q 5.    

Correct4

Incorrect-1

Among the following edible fishes, which one is a marine fish having rich source of omega-3 fatty acids{tex}?{/tex}

A

{tex}Mystus{/tex}

B

Mangur

C

Mrigala

Mackerel

Explanation


Q 6.    

Correct4

Incorrect-1

A system of rotating crops with legume or grass pasture to improve soil structure and fertility is called

A

strip farming

B

shifting agriculture

ley farming

D

contour farming.

Explanation


Q 7.    

Correct4

Incorrect-1

A protoplast is a cell

A

undergoing division

without cell wall

C

without plasma membrane

D

without nucleus.

Explanation


Q 8.    

Correct4

Incorrect-1

Outbreeding is an important strategy of animal husbandry because it

is useful in overcoming inbreeding depression

B

exposes harmful recessive genes that are eliminated by selection

C

helps in accumulation of superior genes

D

is useful in producing purelines of animals.

Explanation


Q 9.    

Correct4

Incorrect-1

A technique of micropropagation is

A

protoplast fusion

B

embryo rescue

C

somatic hybridisation

somatic embryogenesis.

Explanation


Q 10.    

Correct4

Incorrect-1

Which of the following enhances or induces fusion of protoplasts{tex}?{/tex}

A

IAA and kinetin

B

IAA and gibberellins

C

Sodium chloride and potassium chloride

Polyethylene glycol and sodium nitrate

Explanation



Q 11.    

Correct4

Incorrect-1

{tex}In\ vitro{/tex} clonal propagation in plants is characterized by

{tex} \mathrm { PCR } {/tex} and {tex} \mathrm { RAPD } {/tex}

B

northern blotting

C

electrophoresis and HPLC

D

microscopy.

Explanation


Q 12.    

Correct4

Incorrect-1

To obtain virus - free healthy plants from a diseased one by tissue culture technique, which part/parts of the diseased plant will be taken{tex}?{/tex}

A

Apical meristem only

B

Palisade parenchyma

Both apical and axillary meristems

D

Epidermis only

Explanation


Q 13.    

Correct4

Incorrect-1

In plant breeding programmes, the entire collection (of plants/seeds) having all the diverse alleles for all genes in a given crop is called

A

evaluation and selection of parents

germplasm collection

C

selection of superior recombinants

D

cross-hybridisation among the selected parents.

Explanation


Q 14.    

Correct4

Incorrect-1

Tissue culture technique can produce infinite number of new plants from a small parental tissue. The economic importance of the technique is in raising

genetically uniform population identical to the original parent

B

homozygous diploid plants

C

new species

D

variants through picking up somaclonal variations.

Explanation


Q 15.    

Correct4

Incorrect-1

The viability of seeds is tested by

A

2,6 dichlorophenol indophenols

2,3,5 triphenyl tetrazolium chloride

C

DMSO

D

Saffanine.

Explanation



Q 16.    

Correct4

Incorrect-1

Which of the following statements is not true about somatic embryogenesis{tex}?{/tex}

A

The pattern of development of a somatic embryo is comparable to that of a zygotic embryo.

Somatic embryos can develop from microspores

C

Somatic embryo is induced usually by anauxin such as 2, 4 - D.

D

A somatic embryo develops from a somatic cell.

Explanation


Q 17.    

Correct4

Incorrect-1

Which one of the following is a case of wrong matching{tex}?{/tex}

A

Somatic - Fusion of two diverse hybridization cells.

Vector DNA - Site for {tex}t{/tex}RNA synthesis

C

Micropropogation - {tex} in \ vitro {/tex} production of plants in large numbers

D

Callus - Unorganised mass of cells produced in tissue culture

Explanation


Q 18.    

Correct4

Incorrect-1

Which part would be most suitable for raising virus-free plants for micropropagation{tex}?{/tex}

A

Bark

B

Vascular tissue

Meristem

D

Node

Explanation


Q 19.    

Correct4

Incorrect-1

Green revolution in India occurred during

1960 's

B

1970 's

C

1980 's

D

1950 's

Explanation


Q 20.    

Correct4

Incorrect-1

A collection of plants and seed having diverse alleles of all the genes of a crop is called

A

herbarium

germplasm

C

gene library

D

genome.

Explanation


Q 21.    

Correct4

Incorrect-1

"Jaya" and "Ratna" developed for green revolution in India are the varieties of

A

maize

rice

C

wheat

D

bajra.

Explanation


Q 22.    

Correct4

Incorrect-1

'Himgiri' developed by hybridisation and selection for disease resistance against rust pathogens is a variety of

A

chilli

B

maize

C

sugarcane

wheat.

Explanation


Q 23.    

Correct4

Incorrect-1

Breeding of crops with high levels of minerals, vitamins and proteins is called

A

somatic hybridisation

biofortification

C

biomagnification

D

micropropagation.

Explanation


Q 24.    

Correct4

Incorrect-1

Polyethylene glycol method is used for

A

biodiesel production

B

seedless fruit production

C

energy production from sewage

gene transfer without a vector.

Explanation


Q 25.    

Correct4

Incorrect-1

Somaclones are obtained by

A

plant breeding

B

irradiation

C

genetic engineering

tissue culture.

Explanation