Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

81.

Which of the following is the starter codon?

  • UGA

  • UAA

  • UAG

  • UAG


D.

UAG

AUG is a start codon. Others are stop codon.

1269 Views

82.

Which part of the tobacco plant is infected by Meloidogyne incognitia?

  • Leaf

  • Stem

  • Root

  • Root


C.

Root

The nematode inects the roots of the tobacco plant and result in root know disease.

925 Views

83.

Which of the following most appropriately describes haemophilia?

  • X-linked recessive gene disorder
  • Chromosomal disorder

  • Dominant gene disorder

  • Dominant gene disorder


A.

X-linked recessive gene disorder

Haemophilia is a sex-linked that is X-linked recessive disorder.

987 Views

84.

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

  • contour farming

  • strip farming

  • shifting agriculture

  • shifting agriculture


D.

shifting agriculture

1996 Views

85.

Following are the two statements regarding the origin of life

I. The earliest organisms that appeared on the earth were non-green and presumably anaerobes.
II. The first autotrophic organisms were the chemoautotrophs that never released oxygen.

Of the above statement which one of the following options is correct?

  • II is correct but I is false

  • Both I and II are correct

  • Both I and II are false

  • Both I and II are false


B.

Both I and II are correct

The first organisms were chemoautotrophic anaerobes.

1429 Views

86.

A river with an inflow of domestic sewage-rich in organic waste may result in

  • increased population of aquatic food web organism

  • an increased production of fish due to biodegradable nutrients

  • death of fish due to lack of oxygen

  • death of fish due to lack of oxygen


C.

death of fish due to lack of oxygen

A river with sewage increases the organic waste and decreases the dissolved oxygen.

1081 Views

87.

The Taq polymerase enzyme is obtained from

  • Thiobacillus ferroxidans

  • Bacillus subtilis

  • Pseudomonas subtilis

  • Pseudomonas subtilis


D.

Pseudomonas subtilis

Taq polymerase is a thermostable DNA polymerase obtained from Thermus aquaticus. 

2192 Views

88.

Which of the following statements is not true for cancer cells in relation to mutations?

  • Mutations destroy telomerase inhibitor

  • Mutations inactivate the cell control

  • Mutations inhibit production of telomerase

  • Mutations inhibit production of telomerase


C.

Mutations inhibit production of telomerase

Cancerous cells have a high telomerase activity.

1826 Views

89.

Fertilisation in humans is practically feasible only if

  • the ovum and sperms are transported simultaneously to ampullary -isthmic junction of the fallopian tube

  • the ovum and sperms are transported simultaneously to ampullary -isthmic junction of the cervix

  • the sperm are transported into cervix within 48 hrs of releases of ovum in uterus

  • the sperm are transported into cervix within 48 hrs of releases of ovum in uterus


A.

the ovum and sperms are transported simultaneously to ampullary -isthmic junction of the fallopian tube

Fertilisation is possible only if the sperms and ovum are transported simultaneously at ampullary-isthmic junction of fallopian tube. 

1402 Views

90.

Gause's principle of competitive exclusion states that

  • Competition for the same resources excludes species having different food preferences

  • No two species can occupy the same niche indefinitely for the same limiting resources

  • Larger organisms exclude smaller ones through competition

  • Larger organisms exclude smaller ones through competition


B.

No two species can occupy the same niche indefinitely for the same limiting resources

Gause's principle of competitive exclusion states that no species can occupy the same niche indefinitely for the same limiting resources.

1360 Views