NEET Biology Previous year questions October 2020

Inbreeding depression is:

[class-xii ]

Reduced motility and immunity due to close inbreeding
Decreased productivity due to mating of superior male and inferior female
Decrease in body mass of progeny due to continued close inbreeding
Reduced fertility and productivity due to continued close inbreeding

Correct Option: D [ Reduced fertility and productivity due to continued close inbreeding ]

Remark:

Cyclosporin A, used as immuno suppression agent, is produced from:

[class-xii ]

Monascus purpureus
Saccharomyces cerevisiae
Penicillium notatum
Trichoderma polysporum

Correct Option: D [ Trichoderma polysporum ]

Remark:

Match the following columns and select the correct option:

Column-I	Column-II
(A)Dragonflies	(I)Biocontrol agents of several plant pathogens
(B)Bacillus thuringiensis	(II)Get rid of Aphids and mosquitoes
(C)Glomus	(III)Narrow spectrum insecticidal applications
(D)Baculoviruses	(IV)Biocontrol agents of lepidopteran plant pests
	(V)Absorb phosphorus from soil

[class-xii ]

(A)-(III), (B)-(V), (C)-(IV), (D)-(I)
(A)-(II), (B)-(I), (C)-(III), (D)-(IV)
(A)-(II), (B)-(III), (C)-(IV), (D)-(V)
(A)-(II), (B)-(IV), (C)-(V), (D)-(III)

Correct Option: D [ (A)-(II), (B)-(IV), (C)-(V), (D)-(III) ]

Remark:

Match the following techniques or instruments with their usage:

Column-I	Column-II
(A)Bioreactor	(I)Separation of DNA fragments
(B)Electrophoresis	(II)Production of large quantities of products
(C)PCR	(III)Detection of pathogen, based on antigen - antibody reaction
(D)ELISA	(IV)Amplification of nucleic acids

[class-xii ]

(A)-(III), (b)-(II), (c)-(IV), (d)-(I)
(A)-(II), (b)-(I), (c)-(IV), (d)-(III)
(A)-(IV), (b)-(III), (c)-(II), (d)-(I)
(A)-(II), (b)-(I), (c)-(III), (d)-(IV)

Correct Option: B [ (A)-(II), (b)-(I), (c)-(IV), (d)-(III) ]

Remark:

First discovered restriction endonuclease that always cuts DNA molecule at a particular point by recognising a specific sequence of six base pairs is:

[class-xii ]

EcoR1
Adenosine deaminase
Thermostable DNA polymerase
Hind II

Correct Option: D [ Hind II ]

Remark:

Select the correct statement from the following:

[class-xii ]

Gel electrophoresis is used for amplification of a DNA segment.
The polymerase enzyme joins the gene of interest and the vector DNA.
Restriction enzyme digestions are performed by incubating purified DNA molecules with the restriction enzymes of optimum conditions.
PCR is used for isolation and separation of gene of interest.

Correct Option: C [ Restriction enzyme digestions are performed by incubating purified DNA molecules with the restriction enzymes of optimum conditions. ]

Remark:

In a mixture, DNA fragments are separated by:

[class-xii ]

Bioprocess engineering
Restriction digestion
Electrophoresis
Polymerase chain reaction

Correct Option: C [ Electrophoresis ]

Remark:

In Recombinant DNA technology antibiotics are used:

[class-xii ]

to keep medium bacteria-free
to detect alien DNA
to impart disease-resistance to the host plant
as selectable markers

Correct Option: D [ as selectable markers ]

Remark:

RNA interference is used for which of the following purposes in the field of biotechnology?

[class-xii ]

to develop a plant tolerant to abiotic stresses
to develop a pest resistant plant against infestation by nematode
to enhance the mineral usage by the plant
to reduce post harvest losses

Correct Option: B [ to develop a pest resistant plant against infestation by nematode ]

Remark:

The laws and rules to prevent unauthorised exploitation of bio-resources are termed as:

[class-xii ]

Biopatenting
Bioethics
Bioengineering
Biopiracy

Correct Option: A [ Biopatenting ]

Remark:

NEET - October 2020 Previous Year Questions

NEET Biology Previous Year Questions - October 2020

NEET Biology Previous Year Questions (PYQs)