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NEET - 2021 Previous Year Questions



NEET Biology Previous Year Questions - 2021

Receptors for sperm binding in mammals are present on:

NEET-2021 [Human-Reproduction] [class-xii ]

  • Corona radiata
  • Vitelline membrane
  • Perivitelline space
  • Zona pellucida
  • Correct Option: D  [ Zona pellucida ]

    Remark:

Match List-I with List-II.

List-I List-II
(A)Vaults (I)Entry of sperm through Cervix is blocked
(B)IUDs (II)Removal of Vas deferens
(C)Vasectomy (III)Phagocytosis of sperms within the Uterus
(D)Tubectomy (IV)Removal of fallopian tube
Choose the correct answer from the options given below:

NEET-2021 [Reproductive-Health] [class-xii ]

  • A-IV, B-II, C-I, D-III
  • A-I, B-III, C-II, D-IV
  • A-II, B-IV, C-III, D-I
  • A-III, B-I, C-IV, D-II
  • Correct Option: B  [ A-I, B-III, C-II, D-IV ]

    Remark:

Veneral diseases can spread through:
A. Using sterile needles
B. Transfusion of blood from infected person
C. Infected mother to foetus
D. Kissing
E. Inheritance
Choose the correct answer from the options given below.

NEET-2021 [Reproductive-Health] [class-xii ]

  • A, B and C only
  • B, C and D only
  • B and C only
  • A and C only
  • Correct Option: C  [ B and C only ]

    Remark:

Which one of the following is an example of Hormone releasing IUD?

NEET-2021 [Reproductive-Health] [class-xii ]

  • CuT
  • LNG 20
  • Cu 7
  • Multiload 375
  • Correct Option: B  [ LNG 20 ]

    Remark:

In a cross between a male and female, both heterozygous for sickle cell anaemia gene, what percentage of the progeny will be diseased?

NEET-2021 [Principles of Inheritance and Variation] [class-xii ]

  • 50%
  • 75%
  • 25%
  • 100%
  • Correct Option: C  [ 25% ]

    Remark:

If Adenine makes 30% of the DNA molecule, what will be the percentage of Thymine, Guanine and Cytosine in it ?

NEET-2021 [Molecular-Basis-of-Inheritance] [class-xii ]

  • T : 20; G : 30; C : 20
  • T : 20; G : 20; C : 30
  • T : 30; G : 20; C : 20
  • T : 20; G : 25; C : 25
  • Correct Option: C  [ T : 30; G : 20; C : 20 ]

    Remark:

Which is the "Only enzyme" that has "Capability" to catalyse Initiation, Elongation and Termination in the process of transcription in prokaryotes?

NEET-2021 [Molecular-Basis-of-Inheritance] [class-xii ]

  • DNA dependent DNA polymerase
  • DNA dependent RNA polymerase
  • DNA Ligase
  • DNase
  • Correct Option: B  [ DNA dependent RNA polymerase ]

    Remark:

Which of the following RNAs is not required for the synthesis of protein?

NEET-2021 [Molecular-Basis-of-Inheritance] [class-xii ]

  • mRNA
  • tRNA
  • rRNA
  • siRNA
  • Correct Option: D  [ siRNA ]

    Remark:

Which of the following is not an objective of Biofortification in crops?

NEET-2021 [Strategies-for-Enhancement-in-Food-Production] [class-xii ]

  • Improve protein content
  • Improve resistance to diseases
  • Improve vitamin content
  • Improve micronutrient and mineral content
  • Correct Option: B  [ Improve resistance to diseases ]

    Remark:

Match List-I with List-II.

List-I List-II
(A)Aspergillus niger (I)Acetic Acid
(B)Acetobacter aceti (II)Lactic Acid
(C)Clostridium butylicum (III)Citric Acid
(D)Lactobacillus (IV)Butyric Acid
Choose the correct answer from the options given below:

NEET-2021 [Microbes-in-Human-Welfare] [class-xii ]

  • A-I, B-II-, C-III, D-IV
  • A-II, B-III, C-I, D-IV
  • A-IV, B-II, C-I, D-III
  • A-III, B-I, C-IV, D-II
  • Correct Option: D  [ A-III, B-I, C-IV, D-II ]

    Remark: