NEET 2020 — Zoology

All 46 Zoology questions we hold from this paper, of the 180 on the site for this sitting — every option and the answer key. 4 marks each, −1 for a wrong answer.

Zoology

45 questions, one correct option each. +4 for a correct answer, −1 for a wrong one, nothing for a blank.

Q1 open Human Health and Disease · Common diseases: pathogens and life cycles

Match the following diseases with the causative organism and select the correct option.

Disease	Organism
(a) Typhoid	(i) Wuchereria
(b) Pneumonia	(ii) Plasmodium
(c) Filariasis	(iii) Salmonella
(d) Malaria	(iv) Haemophilus

A.(a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
B.(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)✓
C.(a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)
D.(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)

The worked solution is part of a paid pack.

Q2 open Reproductive Health · MTP, STDs and infertility; ART

In which of the following techniques are embryos transferred to assist females who cannot conceive?

A.ZIFT and IUT✓
B.GIFT and ZIFT
C.ICSI and ZIFT
D.GIFT and ICSI

The worked solution is part of a paid pack.

Q3 open Biotechnology: Principles and Processes · Tools of recombinant DNA technology

Choose the correct pair from the following.

A.Ligases – Join two DNA molecules✓
B.Polymerases – Break DNA into fragments
C.Nucleases – Separate the two strands of DNA
D.Exonucleases – Make cuts at specific positions within DNA

The worked solution is part of a paid pack.

Q4 open Animal Kingdom · Non-chordates: Porifera to Echinodermata

Match the following columns and select the correct option.

Feature	Example
(a) Gregarious, polyphagous pest	(i) Asterias
(b) Adult with radial symmetry and larva with bilateral symmetry	(ii) Scorpion
(c) Book lungs	(iii) Ctenoplana
(d) Bioluminescence	(iv) Locusta

A.(a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
B.(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)✓
C.(a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
D.(a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)

The worked solution is part of a paid pack.

Q5 open Human Health and Disease · Common diseases: pathogens and life cycles

The infectious stage of Plasmodium that enters the human body is:

A.Trophozoites
B.Sporozoites✓
C.Female gametocytes
D.Male gametocytes

The worked solution is part of a paid pack.

Q6 open Biomolecules · Carbohydrates, lipids, amino acids and proteins

Identify the substances having a glycosidic bond and a peptide bond, respectively, in their structure.

A.Chitin, cholesterol
B.Glycerol, trypsin
C.Cellulose, lecithin
D.Inulin, insulin✓

The worked solution is part of a paid pack.

Q7 open Structural Organisation in Animals · Animal tissues

Cuboidal epithelium with a brush border of microvilli is found in:

A.The lining of the intestine
B.The ducts of the salivary gland
C.The proximal convoluted tubule of the nephron✓
D.The eustachian tube

The worked solution is part of a paid pack.

Q8 open Biotechnology: Principles and Processes · Processes: cloning, PCR, bioreactors

In gel electrophoresis, separated DNA fragments can be visualised with the help of:

A.Acetocarmine in bright blue light
B.Ethidium bromide in UV radiation✓
C.Acetocarmine in UV radiation
D.Ethidium bromide in infrared radiation

The worked solution is part of a paid pack.

Q9 open Breathing and Exchange of Gases · Exchange and transport of gases

Identify the wrong statement with reference to the transport of oxygen.

A.Binding of oxygen with haemoglobin is mainly related to the partial pressure of $O_{2}$
B.Partial pressure of $C O_{2}$ can interfere with $O_{2}$ binding to haemoglobin
C.A higher $H^{+}$ concentration in the alveoli favours the formation of oxyhaemoglobin✓
D.Low $p C O_{2}$ in the alveoli favours the formation of oxyhaemoglobin

The worked solution is part of a paid pack.

Q10 open Biotechnology: Principles and Processes · Tools of recombinant DNA technology

The specific palindromic sequence recognised by EcoRI is:

A.5′-GAATTC-3′ / 3′-CTTAAG-5′✓
B.5′-GGAACC-3′ / 3′-CCTTGG-5′
C.5′-CTTAAG-3′ / 3′-GAATTC-5′
D.5′-GGATCC-3′ / 3′-CCTAGG-5′

The worked solution is part of a paid pack.

Q11 open Biotechnology: Principles and Processes · Tools of recombinant DNA technology

Identify the wrong statement with regard to restriction enzymes.

A.Each restriction enzyme functions by inspecting the length of a DNA sequence
B.They cut the strand of DNA at palindromic sites
C.They are useful in genetic engineering
D.Sticky ends can be joined by using DNA ligases✓

The worked solution is part of a paid pack.

Q12 open Breathing and Exchange of Gases · Respiratory organs and mechanism of breathing

Select the correct events that occur during inspiration.

(a) Contraction of the diaphragm

(b) Contraction of the external inter-costal muscles

(d) Intra-pulmonary pressure increases

A.(a) and (b)✓
B.(c) and (d)
C.(a), (b) and (d)
D.Only (d)

The worked solution is part of a paid pack.

Q13 open

If the head of a cockroach is removed, it may live for a few days because:

A.The supra-oesophageal ganglia of the cockroach are situated in the ventral part of the abdomen
B.The cockroach does not have a nervous system
C.The head holds only a small proportion of the nervous system while the rest is situated along the ventral part of its body✓
D.The head holds a third of the nervous system while the rest is situated along the dorsal part of its body

The worked solution is part of a paid pack.

Q14 open Animal Kingdom · Chordates: Pisces to Mammalia

Which of the following statements are true for the phylum Chordata?

(a) In Urochordata, the notochord extends from head to tail and is present throughout their life

(b) In Vertebrata, the notochord is present only during the embryonic period

(d) Chordata is divided into three subphyla: Hemichordata, Tunicata and Cephalochordata

A.(d) and (c)
B.(c) and (a)
C.(a) and (b)
D.(b) and (c)✓

The worked solution is part of a paid pack.

Q15 open Biotechnology: Principles and Processes · Tools of recombinant DNA technology

Match the organism with its use in biotechnology.

Organism	Use
(a) Bacillus thuringiensis	(i) Cloning vector
(b) Thermus aquaticus	(ii) Construction of the first rDNA molecule
(c) Agrobacterium tumefaciens	(iii) DNA polymerase
(d) Salmonella typhimurium	(iv) Cry proteins

Select the correct option from the following:

A.(a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
B.(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)✓
C.(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
D.(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)

The worked solution is part of a paid pack.

Q16 open Biomolecules · Carbohydrates, lipids, amino acids and proteins

Match the following.

Description	Substance
(a) Inhibitor of catalytic activity	(i) Ricin
(b) Possesses peptide bonds	(ii) Malonate
(c) Cell wall material in fungi	(iii) Chitin
(d) Secondary metabolite	(iv) Collagen

Choose the correct option from the following:

A.(a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)✓
B.(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
C.(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
D.(a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)

The worked solution is part of a paid pack.

Q17 open Human Reproduction · Gametogenesis and menstrual cycle

The meiotic division of the secondary oocyte is completed:

A.Prior to ovulation
B.At the time of copulation
C.After zygote formation
D.At the time of fusion of a sperm with an ovum✓

The worked solution is part of a paid pack.

Q18 open Biotechnology and its Applications · Applications in medicine: insulin, gene therapy, molecular diagnosis

Which of the following statements is not correct?

A.In man, insulin is synthesised as a proinsulin
B.The proinsulin has an extra peptide called the C-peptide
C.The functional insulin has the A and B chains linked together by hydrogen bonds✓
D.Genetically engineered insulin is produced in E. coli

The worked solution is part of a paid pack.

Q19 open Animal Kingdom · Chordates: Pisces to Mammalia

Match the following columns and select the correct option.

Feature	Group
(a) 6–15 pairs of gill slits	(i) Trygon
(b) Heterocercal caudal fin	(ii) Cyclostomes
(c) Air bladder	(iii) Chondrichthyes
(d) Poison sting	(iv) Osteichthyes

A.(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)✓
B.(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
C.(a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
D.(a)-(i), (b)-(iv), (c)-(iii), (d)-(ii)

The worked solution is part of a paid pack.

Q20 open Evolution · Origin of life and evidences of evolution

From his experiments, S.L. Miller produced amino acids by mixing the following in a closed flask:

A. $C H_{4}$ , $H_{2}$ , $N H_{3}$ and water vapour at 800 °C✓
B. $C H_{3}$ , $H_{2}$ , $N H_{4}$ and water vapour at 800 °C
C. $C H_{4}$ , $H_{2}$ , $N H_{3}$ and water vapour at 600 °C
D. $C H_{3}$ , $H_{2}$ , $N H_{3}$ and water vapour at 600 °C

The worked solution is part of a paid pack.

Q21 open Evolution · Origin of life and evidences of evolution

Embryological support for evolution was disapproved by:

A.Karl Ernst von Baer✓
B.Alfred Wallace
C.Charles Darwin
D.Oparin

The worked solution is part of a paid pack.

Q22 open Biotechnology and its Applications · Applications in agriculture: Bt crops, RNAi

The Bt cotton variety, developed by introducing the toxin gene of Bacillus thuringiensis (Bt), is resistant to:

A.Insect pests✓
B.Fungal diseases
C.Plant nematodes
D.Insect predators

The worked solution is part of a paid pack.

Q23 open Evolution · Natural selection, Hardy–Weinberg, adaptive radiation

Which of the following refer to correct example(s) of organisms that have evolved due to changes in the environment brought about by anthropogenic action?

(a) Darwin's finches of the Galapagos Islands

(b) Herbicide-resistant weeds

(d) Man-created breeds of domesticated animals like dogs

A.Only (a)
B.(a) and (c)
C.(b), (c) and (d)✓
D.Only (d)

The worked solution is part of a paid pack.

Q24 open Human Health and Disease · Immunity, vaccination, AIDS, cancer

Identify the wrong statement with reference to immunity.

A.When exposed to an antigen (living or dead), antibodies are produced in the host's body — this is called active immunity
B.When ready-made antibodies are directly given, it is called passive immunity
C.Active immunity is quick and gives a full response✓
D.A foetus receives some antibodies from its mother — this is an example of passive immunity

The worked solution is part of a paid pack.

Q25 open

By which method was the new sheep breed 'Hisardale' formed, using Bikaneri ewes and Marino rams?

A.Out-crossing
B.Mutation breeding
C.Cross-breeding✓
D.Inbreeding

The worked solution is part of a paid pack.

Q26 open

Identify the correct statement with reference to the human digestive system.

A.The ileum opens into the small intestine
B.The serosa is the innermost layer of the alimentary canal
C.The ileum is a highly coiled part✓
D.The vermiform appendix arises from the duodenum

The worked solution is part of a paid pack.

Q27 open Chemical Coordination and Integration · Disorders

Presence of which of the following conditions in urine is indicative of diabetes mellitus?

A.Uremia and ketonuria
B.Uremia and renal calculi
C.Ketonuria and glycosuria✓
D.Renal calculi and hyperglycaemia

The worked solution is part of a paid pack.

Q28 open Reproductive Health · MTP, STDs and infertility; ART

Select the option including all sexually transmitted diseases.

A.Gonorrhoea, syphilis, genital herpes✓
B.Gonorrhoea, malaria, genital herpes
C.AIDS, malaria, filaria
D.Cancer, AIDS, syphilis

The worked solution is part of a paid pack.

Q29 open Human Reproduction · Gametogenesis and menstrual cycle

Which of the following hormone levels will cause the release of the ovum (ovulation) from the Graafian follicle?

A.A high concentration of oestrogen✓
B.A high concentration of progesterone
C.A low concentration of LH
D.A low concentration of FSH

The worked solution is part of a paid pack.

Q30 open Biotechnology and its Applications · Applications in medicine: insulin, gene therapy, molecular diagnosis

Match the following columns and select the correct option.

Item	Association
(a) Bt cotton	(i) Gene therapy
(b) Adenosine deaminase deficiency	(ii) Cellular defence
(c) RNAi	(iii) Detection of HIV infection
(d) PCR	(iv) Bacillus thuringiensis

A.(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)✓
B.(a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
C.(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
D.(a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)

The worked solution is part of a paid pack.

Q31 open

The enzyme enterokinase helps in the conversion of:

A.Protein into polypeptides
B.Trypsinogen into trypsin✓
C.Caseinogen into casein
D.Pepsinogen into pepsin

The worked solution is part of a paid pack.

Q32 open

Match the following columns and select the correct option.

Structure	Description
(a) Organ of Corti	(i) Connects the middle ear and pharynx
(b) Cochlea	(ii) Coiled part of the labyrinth
(c) Eustachian tube	(iii) Attached to the oval window
(d) Stapes	(iv) Located on the basilar membrane

A.(a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)
B.(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
C.(a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)✓
D.(a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)

The worked solution is part of a paid pack.

Q33 open Excretory Products and their Elimination · Urine formation and its regulation

Which of the following would help in the prevention of diuresis?

A.More water reabsorption due to under-secretion of ADH
B.Reabsorption of $N a^{+}$ and water from the renal tubules due to aldosterone✓
C.Atrial natriuretic factor causes vasoconstriction
D.Decrease in the secretion of renin by JG cells

The worked solution is part of a paid pack.

Q34 open Human Reproduction · Male and female reproductive systems

Match the following columns and select the correct option.

Structure	Description
(a) Placenta	(i) Androgens
(b) Zona pellucida	(ii) Human chorionic gonadotropin (hCG)
(c) Bulbo-urethral glands	(iii) Layer of the ovum
(d) Leydig cells	(iv) Lubrication of the penis

A.(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
B.(a)-(i), (b)-(iv), (c)-(ii), (d)-(iii)
C.(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
D.(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)✓

The worked solution is part of a paid pack.

Q35 open Evolution · Natural selection, Hardy–Weinberg, adaptive radiation

Flippers of penguins and dolphins are examples of:

A.Adaptive radiation
B.Convergent evolution✓
C.Industrial melanism
D.Natural selection

The worked solution is part of a paid pack.

Q36 open Body Fluids and Circulation · Human heart, cardiac cycle and ECG

The QRS complex in a standard ECG represents:

A.Repolarisation of the atria
B.Depolarisation of the atria
C.Depolarisation of the ventricles✓
D.Repolarisation of the ventricles

The worked solution is part of a paid pack.

Q37 open Body Fluids and Circulation · Blood, blood groups and lymph

Match the following columns and select the correct option.

Cell	Feature
(a) Eosinophils	(i) Immune response
(b) Basophils	(ii) Phagocytosis
(c) Neutrophils	(iii) Release histaminase and destructive enzymes
(d) Lymphocytes	(iv) Release granules containing histamine

A.(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)✓
B.(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
C.(a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)
D.(a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)

The worked solution is part of a paid pack.

Q38 open Biotechnology: Principles and Processes · Tools of recombinant DNA technology

The sequence that controls the copy number of the linked DNA in the vector is termed:

A.A selectable marker
B.The ori site✓
C.A palindromic sequence
D.A recognition site

The worked solution is part of a paid pack.

Q39 open Biomolecules · Carbohydrates, lipids, amino acids and proteins

Identify the basic amino acid from the following.

A.Tyrosine
B.Glutamic acid
C.Lysine✓
D.Valine

The worked solution is part of a paid pack.

Q40 open Chemical Coordination and Integration · Disorders

Match the following columns and select the correct option.

Gland	Disorder
(a) Pituitary gland	(i) Graves' disease
(b) Thyroid gland	(ii) Diabetes mellitus
(c) Adrenal gland	(iii) Diabetes insipidus
(d) Pancreas	(iv) Addison's disease

A.(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
B.(a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
C.(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)✓
D.(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)

The worked solution is part of a paid pack.

Q41 open Chemical Coordination and Integration · Endocrine glands and their hormones

Select the correct statement.

A.Glucocorticoids stimulate gluconeogenesis✓
B.Glucagon is associated with hypoglycaemia
C.Insulin acts on pancreatic cells and adipocytes
D.Insulin is associated with hyperglycaemia

The worked solution is part of a paid pack.

Q42 open Biomolecules · Carbohydrates, lipids, amino acids and proteins

Which one of the following is the most abundant protein in animals?

A.Haemoglobin
B.Collagen✓
C.Lectin
D.Insulin

The worked solution is part of a paid pack.

Q43 open Locomotion and Movement · Skeletal system and joints

Match the following columns and select the correct option.

Structure	Description
(a) Floating ribs	(i) Located between the second and seventh ribs
(b) Acromion	(ii) Head of the humerus
(c) Scapula	(iii) Clavicle
(d) Glenoid cavity	(iv) Do not connect with the sternum

A.(a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
B.(a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
C.(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
D.(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)✓

The worked solution is part of a paid pack.

Q44 open Animal Kingdom · Non-chordates: Porifera to Echinodermata

Bilaterally symmetrical and acoelomate animals are exemplified by:

A.Ctenophora
B.Platyhelminthes✓
C.Aschelminthes
D.Annelida

The worked solution is part of a paid pack.

Q45 open Structural Organisation in Animals · Animal tissues

Goblet cells of the alimentary canal are modified from:

A.Squamous epithelial cells
B.Columnar epithelial cells✓
C.Chondrocytes
D.Compound epithelial cells

The worked solution is part of a paid pack.

Q46 open

Snow blindness in the Antarctic region is due to:

A.Freezing of fluids in the eye caused by low temperature
B.Inflammation of the cornea due to a high dose of UV-B radiation✓
C.High reflection of light from snow
D.Damage to the retina caused by infra-red rays

The worked solution is part of a paid pack.