NTA - NEET 2020 Exam Paper (Covid Re-exam)

1.

Which of the following is incorrect about Cyanobacteria?
1. They are photoautotrophs
2. They lack heterocysts
3. They often form blooms in polluted water bodies
4. They have chlorophyll A similar to green plants

2.

Phycoerythrin is the major pigment in :
1. Red algae
2. Blue-green algae
3. Green algae
4. Brown algae

3.

Which of the following statements is incorrect about gymnosperms?
1. They are heterosporous
2. Male and female gametophytes are free-living
3. Most of them have narrow leaves with thick cuticle
4. Their seeds are not covered

4.

Male and female gametophytes do not have an independent free-living existence in:-
1. Pteridophytes
2. Algae
3. Angiosperms
4. Bryophytes

5.

Which of the following options does correctly represent the characteristic features of phylum Annelida?

1.	Triploblastic, unsegmented body, and bilaterally symmetrical.
2.	Triploblastic, a segmented body, and bilaterally symmetrical.
3.	Triploblastic, flattened body, and acoelomate condition.
4.	Diploblastic, mostly marine and radially symmetrical.

6.

Match the following group of organisms with their respective distinctive characteristics and select the correct option :

	Organisms		Characteristics
(a)	Platyhelminthes	(i)	Cylindrical body with no segmentation
(b)	Echinoderms	(ii)	Warm blooded animals with direct development
(c)	Hemichordates	(iii)	Bilateral symmetry with incomplete digestive system
(d)	Aves	(iv)	Radial symmetry with indirect development

	(a)	(b)	(c)	(d)
1.	(iii)	(iv)	(i)	(ii)
2.	(ii)	(iii)	(iv)	(i)
3.	(iv)	(i)	(ii)	(iii)
4.	(i)	(ii)	(iii)	(iv)

7.

Match the following columns and select the correct option :

	Column - I		Column - II
(a)	Aptenodytes	(i)	Flying fox
(b)	Pteropus	(ii)	Angel fish
(c)	Pterophyllum	(iii)	Lamprey
(d)	Petromyzon	(iv)	Penguin

	(a)	(b)	(c)	(d)
1.	(iii)	(iv)	(ii)	(i)
2.	(iii)	(iv)	(i)	(ii)
3.	(iv)	(i)	(ii)	(iii)
4.	(ii)	(i)	(iv)	(iii)

8.

All vertebrates are chordates but all chordates are not vertebrates, why?

1.	Notochord is replaced by a vertebral column in adults of some chordates.
2.	Ventral hollow nerve cord remains throughout life in some chordates.
3.	All chordates possess a vertebral column.
4.	All chordates possess notochord throughout their life.

9.

Correct position of floral parts over thalamus in the mustard plant is :
(1) Gynoecium occupies the highest position, while the other parts are situated below it.
(2) Margin of the thalamus grows upward, enclosing the ovary completely, and other parts arise below the ovary.
(3) Gynoecium is present in the center and other parts cover it partially.
(4) Gynoecium is situated in the center, and other parts of the flower are located at the rim of the thalamus, at the same level.

10.

Which of the following is the correct floral formula of Liliaceae?
1.
2.
3.
4.

11.

Identify the correct features of Mango and Coconut fruits.

(i)	In both, fruit is a drupe.
(ii)	Endocarp is edible in both.
(iii)	Mesocarp in Coconut is fibrous, and in Mango, it is fleshy.
(iv)	In both, the fruit develops from the monocarpellary ovary.

Select the correct option from below :
1. (i), (iii) and (iv) only
2. (i), (ii) and (iii) only
3. (i) and (iv) only
4. (i) and (ii) only

12.

Large, empty colorless cells of the adaxial epidermis along the veins of grass leaves are
1. Lenticels
2. Guard cells
3. Bundle sheath cells
4. Bulliform cells

13.

Which of the following statements about cork cambium is incorrect?
1. It forms a secondary cortex on its outside
2. It forms a part of periderm
3. It is responsible for the formation of lenticels
4. It is a couple of layers thick

14.

In cockroach, identify the parts of the foregut in correct sequence:-
1. Mouth $\to$ Oesophagus $\to$ Pharynx $\to$ Crop $\to$ Gizzard
2. Mouth $\to$ Crop $\to$ Pharynx $\to$ Oesophagus $\to$ Gizzard
3. Mouth $\to$ Gizzard $\to$ Crop $\to$ Pharynx $\to$ Oesophagus
4. Mouth $\to$ Pharynx $\to$ Oesophagus $\to$ Crop $\to$ Gizzard

15.

Match the following columns with reference to cockroach and select the correct option :

	Column I		Column II
(a)	Grinding of the food particles	(i)	Hepatic caeca
(b)	Secrete gastric juice	(ii)	10th segment
(c)	10 pairs	(iii)	Proventriculus
(d)	Anal cerci	(iv)	Spiracles
		(v)	Alary muscles

Options:

	(a)	(b)	(c)	(d)
1.	(iii)	(i)	(iv)	(ii)
2.	(iv)	(iii)	(v)	(ii)
3.	(i)	(iv)	(iii)	(ii)
4.	(ii)	(iii)	(i)	(iv)

16.

Select the incorrectly matched pair from the following:
1. Chondrocytes - Smooth muscle cells
2. Neurons - Nerve cells
3. Fibroblast - Areolar tissue
4. Osteocytes - Bone cells

17.

Inclusion bodies of blue-green, purple, and green photosynthetic bacteria are :
1. Contractile vacuoles
2. Gas vacuoles
3. Centrioles
4. Microtubules

18.

The biosynthesis of ribosomal RNA occurs in:

1.	Ribosomes	2.	Golgi apparatus
3.	Microbodies	4.	Nucleolus

19.

The size of Pleuropneumonia - like Organism (PPLO) is :
1. 0.02 $μ$ m
2. 1-2 $μ$ m
3. 10-20 $μ$ m
4. 0.1 $μ$ m

20.

Match the following columns and select the correct option :

	Column - I		Column - II
(a)	Smooth endoplasmic reticulum	(i)	Protein synthesis
(b)	Rough endoplasmic reticulum	(ii)	Lipid synthesis
(c)	Golgi complex	(iii)	Glycosylation
(d)	Centriole	(iv)	Spindle formation

	(a)	(b)	(c)	(d)
1.	(ii)	(i)	(iii)	(iv)
2.	(iii)	(i)	(ii)	(iv)
3.	(iv)	(ii)	(i)	(iii)
4.	(i)	(ii)	(iii)	(iv)

21.

Identify the statement which is incorrect.
1. Sulphur is an integral part of cysteine.
2. Glycine is an example of lipids.
3. Lecithin contains a phosphorus atom in its structure.
4. Tyrosine possesses an aromatic ring in its structure.

22.

Match the following :
(a) Aquaporin (i) Amide
(b) Asparagine (ii) Polysaccharide
(c) Abscisic acid (iii) Polypeptide
(d) Chitin (iv) Carotenoids
Select the correct option :
1. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
2. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
3. (a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
4. (a)-(iii), (b)-(i), (c) -(ii), (d)-(iv)

23.

Attachment of spindle fibers to kinetochores of chromosomes becomes evident in:

1.	Anaphase	2.	Telophase
3.	Prophase	4.	Metaphase

24.

In a mitotic cycle, the correct sequence of phases is
(1) S, $G_{1}$ , $G_{2}$ , M
(2) $G_{1}$ , S, $G_{2}$ , M
(3) M, $G_{1}$ , $G_{2}$ , S
(4) $G_{1}$ , $G_{2}$ , S, M

25.

During Meiosis I, in which stage synapsis takes place?
1. Pachytene
2. Zygotene
3. Diplotene
4. Leptotene

26.

Match the following events that occur in their respective phases of cell cycle and select the correct option

(a)	G₁ phase	(i)	Cell grows and organelle duplication
(b)	S phase	(ii)	DNA replication and chromosome duplication
(c)	G₂ phase	(iii)	Cytoplasmic growth
(d)	Metaphase in M-phase	(iv)	Alignment of chromosomes

	(a)	(b)	(c)	(d)
1.	(ii)	(iii)	(iv)	(i)
2.	(iii)	(iv)	(i)	(ii)
3.	(iv)	(i)	(ii)	(iii)
4.	(i)	(ii)	(iii)	(iv)

27.

Select the incorrect statement.
1. Transport of molecules in phloem can be bidirectional.
2. The movement of minerals in the xylem is unidirectional.
3. Unloading of sucrose at the sink does not involve the utilization of ATP.
4. Elements most easily mobilized in plants from one region to another are phosphorus, sulfur, nitrogen, and potassium.

28.

In Glycine max, the product of biological nitrogen fixation is transported from the root nodules to other parts as:
1. Ammonia
2. Glutamate
3. Nitrates
4. Ureides

29.

Which of the following element helps in maintaining the structure of ribosomes?

1. Magnesium	2. Zinc
3. Copper	4. Molybdenum

30.

During non-cyclic photophosphorylation, when electrons are lost from the reaction center at PS II, what is the source which replaces these electrons?

1.	Oxygen	2.	Water
3.	Carbon dioxide	4.	Light

31.

Which of the following statements is incorrect?
1. RuBisCO is a bifunctional enzyme
2. In C₄ plants, the site of RuBisCO activity is mesophyll cell
3. The substrate molecule for RuBisCO activity is a 5-carbon compound
4. RuBisCO action requires ATP and NADPH

32.

Pyruvate dehydrogenase activity during aerobic respiration requires:

1.	Calcium	2.	Iron
3.	Cobalt	4.	Magnesium

33.

Who coined the term 'Kinetin'?

1.	Skoog and Miller	2.	Darwin
3.	Went	4.	Kurosawa

34.

Inhibitory substances in dormant seeds cannot be removed by subjecting seeds to:
1. Gibberellic acid
2. Nitrate
3. Ascorbic acid
4. Chilling conditions

35.

Match the following concerning the activity/function and the phytohormone involved:-

(a)	Fruit ripener	(i)	Abscisic acid
(b)	Herbicide	(ii)	GA 3
(c)	Bolting agent	(iii)	2, 4-D
(d)	Stress hormone	(iv)	Ethephon

Select the correct option from following:-

	(a)	(b)	(c)	(d)
1.	(ii)	(iii)	(iv)	(i)
2.	(iii)	(iv)	(ii)	(i)
3.	(iv)	(iii)	(ii)	(i)
4.	(iv)	(ii)	(i)	(iii)

36.

The intrinsic factor that helps in the absorption of vitamin $B_{12}$ is secreted by-
1. Goblet cells
2. Hepatic cells
3. Oxyntic cells
4. Chief cells

37.

The proteolytic enzyme rennin is found in :
(1) Intestinal juice
(2) Bile juice
(3) Gastric juice
(4) Pancreatic juice

38.

The Total Lung Capacity (TLC) is the total volume of air accommodated in the lungs at the end of forced inspiration. This includes :
(1) RV; IC (Inspiratory Capacity); EC (Expiratory Capacity); and ERV
(2) RV; ERV; IC and EC
(3) RV; ERV; VC (Vital Capacity) and FRC (Functional Residual Capacity)
(4) RV (Residual Volume); ERV (Expiratory Reserve Volume); TV (Tidal Volume); and IRV (Inspiratory Reserve Volume)

39.

Match the following columns and select the correct option :

	Column I		Column II
(a)	Pneumotaxic centre	(i)	Alveoli
(b)	O₂ dissociation curve	(ii)	Pons region of the brain
(c)	Carbonic anhydrase	(iii)	Haemoglobin
(d)	Primary site of exchange of gases	(iv)	R.B.C.

Options:

	(a)	(b)	(c)	(d)
1.	(i)	(iii)	(ii)	(iv)
2.	(ii)	(iii)	(iv)	(i)
3.	(iii)	(ii)	(iv)	(i)
4.	(iv)	(i)	(iii)	(ii)

40.

Which of the following is associated with a decrease in cardiac output?
1. Sympathetic nerves
2. Parasympathetic neural signals
3. Pneumotaxic center
4. Adrenal medullary hormones

41.

Which of the following conditions cause erythroblastosis foetalis?
1. Mother Rh^+ve and fetus Rh^-ve
2. Mother Rh^-ve and fetus Rh^+ve
3. Both mother and fetus Rh^-ve
4. Both mother and fetus Rh^+ve

42.

The increase in osmolarity from outer to inner medullary interstitium is maintained due to:

(i)	Close proximity between Henle's loop and vasa recta
(ii)	Counter current mechanism
(iii)	Selective secretion of HCO^3– and hydrogen ions in PCT
(iv)	Higher blood pressure in glomerular capillaries

1.	Only (ii)	2.	(iii) and (iv)
3.	(i), (ii) and (iii)	4.	(i) and (ii)

43.

Select the correct statement :

1.	Atrial Natriuretic Factor increases blood pressure.
2.	Angiotensin II is a powerful vasodilator.
3.	Counter current pattern of blood flow is not observed in the vasa recta.
4.	Reduction in Glomerular Filtration Rate activates JG cells to release renin.

44.

Match the following columns and select the correct option
Column - I Column - II
(a) Gout (i) Decreased levels of estrogen
(b) Osteoporosis (ii) Low ${Ca}^{+ +}$ ions in the blood
(c) Tetany (iii) Accumulation of uric acid crystals
(d) Muscular (iv) Auto immune dystrophy disorder
(v) Genetic disorder
1. (a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)
2. (a)-(iii), (b)-(i), (c)-(ii), (d)-(v)
3. (a)-(iv), .(b)-(v), (c)-(i), (d)-(ii)
4. (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)

45.

Match the following columns and select the correct option :

	Column I		Column II
(a)	Rods and cones	(i)	Absence of Cones photoreceptor cells
(b)	Blind Spot	(ii)	Cones are densely packed
(c)	Fovea	(iii)	Photoreceptor cells
(d)	Iris	(iv)	Visible coloured portion of the eye

Options:

	(a)	(b)	(c)	(d)
1.	(iii)	(i)	(ii)	(iv)
2.	(ii)	(iii)	(i)	(iv)
3.	(iii)	(iv)	(ii)	(i)
4.	(ii)	(iv)	(iii)	(i)

46.

Match the following columns and select the correct option:-
Column-I Column-II
(a) Pituitary hormone (i) Steroid
(b) Epinephrine (ii) Neuropeptides
(c) Endorphins (iii) Peptides, proteins
(d) Cortisol (iv) Biogenic amines
1. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
2. (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
3. (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
4. (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)

47.

Hormones stored and released from neurohypophysis are:-
1. Thyroid-stimulating hormone and Oxytocin
2. Oxytocin and Vasopressin
3. Follicle-stimulating hormone and leutinizing hormone
4. Prolactin and Vasopressin

48.

Vegetative propagule in Agave is as:
1. Rhizome
2. Bulbil
3. Offset
4. Eye

49.

In some plants, the thalamus contributes to fruit formation. Such fruits are termed as
(1) False fruits
(2) Aggregate fruits
(3) True fruits
(4) Parthenocarpic fruit

50.

Which of the following is incorrect for wind-pollinated plants?
(1) Well exposed stamens and stigma
(2) Many ovules in each ovary
(3) Flowers are small and not brightly colored
(4) Pollen grains are light and non-sticky

51.

In human beings, at the end of 12 weeks (first trimester) of pregnancy, the following is observed:
(1) Eyelids and eyelashes are formed
(2) Most of the major organ systems are formed
(3) The head is covered with fine hair
(4) Movement of the fetus

52.

Select the correct option of haploid cells from the following groups :

1.	Primary oocyte, Secondary oocyte, Spermatid
2.	Secondary spermatocyte, First polar body, Ovum
3.	Spermatogonia, Primary spermatocyte, Spermatid
4.	Primary spermatocyte, Secondary spermatocyte, Second polar body

53.

Match the following columns and select the correct option :
Column - I Column - II
(a) Ovary (i) Human chorionic Gonadotropin
(b) Placenta (ii) Estrogen & Progesterone
(c) Corpus luteum (iii) Androgens
(d) Leydig cells (iv) Progesterone only
(1) (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
(2) (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
(3) (a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
(4) (a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)

54.

Progestogens alone or in combination with estrogens can be used as a contraceptive in the form of -
(1) Implants only
(2) Injections only
(3) Pills, injections and implants
(4) Pills only

55.

Chromosomal theory of inheritance was proposed by:

1.	Sutton and Boveri
2.	Bateson and Punnet
3.	T. H. Morgan
4.	Watson and Crick

56.

The number of contrasting characters studied by Mendel for his experiments was :
(1) 14
(2) 4
(3) 2
(4) 7

57.

The best example for pleiotropy is:-
(1) Skin color
(2) Phenylketonuria
(3) Colour Blindness
(4) ABO Blood group

58.

The term 'Nuclein' for the genetic material was used by :
(1) Franklin
(2) Mischer
(3) Chargaff
(4) Mendel

59.

In the polynucleotide chain of DNA, a nitrogenous base is linked to the –OH of:
(1) 2'C pentose sugar
(2) 3'C pentose sugar
(3) 5'C pentose sugar
(4) 1'C pentose sugar

60.

E.coli has only 4.6 × $10^{6}$ base pairs and completes the process of replication within 18 minutes; then the average rate of polymerization is approximate-
(1) 2000 base pairs/second
(2) 3000 base pairs/second
(3) 4000 base pairs/second
(4) 1000 base pairs/second

61.

Which is the basis of genetic mapping of the human genome as well as DNA fingerprinting ?
(1) Polymorphism in the DNA sequence
(2) Single nucleotide polymorphism
(3) Polymorphism in hnRNA sequence
(4) Polymorphism in the RNA sequence

62.

Embryological support for evolution was proposed by
(1) Ernst Heckel
(2) Karl Ernst von Baer
(3) Charles Darwin
(4) Alfred Wallace

63.

After about how many years of the formation of the earth, life appeared on this planet?
(1) 500 billion years
(2) 50 million years
(3) 500 million years
(4) 50 billion years

64.

The phenomenon of the evolution of different species in a given geographical area starting from a point and spreading to other habitats is called:-
1. Saltation
2. Co-evolution
3. Natural selection
4. Adaptive radiation

65.

A Hominid fossil discovered in Java in 1891, now extinct, having a cranial capacity of about 900 ccs was:
(1) Homo erectus
(2) Neanderthal man
(3) Homo sapiens
(4) Australopithecus

66.

For the commercial and industrial production of Citric Acid, which of the following microbes is used?
(1) Aspergillus niger
(2) Lactobacillus sp
(3) Saccharomyces cerevisiae
(4) Clostridium bretylium

67.

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 mosquitoes
c)	Glomus	(iii)	Narrow spectrum insecticidal applications
d)	Baculoviruses	(iv)	Biocontrol agents of lepidopteran plant pests
		(v)	Absorb phosphorus from soil

(1) (a)-(iii), (b)-(v), (c)-(iv), (d)-(i)
(2) (a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)
(3) (a)-(ii), (b)-(iii), (c)-(iv), (d)-(v)
(4) (a)-(ii), (b)-(iv), (c)-(v), (d)-(iii)

68.

Cyclosporin A, used as an immuno suppression agent, is produced from
(1) Monascus purpureus
(2) Saccharomyces cerevisiae
(3) Penicillium notatum
(4) Trichoderma polysporum

69.

Inbreeding depression is -
(1) Reduced motility and immunity due to close inbreeding
(2) Decreased productivity due to mating of superior male and inferior female
(3) Decrease in body mass of progeny due to continued close inbreeding
(4) Reduced fertility and productivity due to continued close inbreeding

70.

Which of the following STDs are not curable?
(1) Genital herpes, Hepatitis B, HIV infection
(2) Chlamydiasis, Syphilis, Genital warts
(3) HIV, Gonorrhoea, Trichomoniasis
(4) Gonorrhoea, Trichomoniasis, Hepatitis B

71.

Match the following columns and select the correct option :
Column - I Column - II
(i) Typhoid (a) Haemophilus influenzae
(ii) Malaria (b) Wuchereria bancrofti
(iii) Pneumonia (c) Plasmodium vivax
(iv) Filariasis (d) Salmonella typhi
(1) (i)-(d), (ii)-(c), (iii)-(a), (iv)-(b)
(2) (i)-(c), (ii)-(d), (iii)-(b), (iv)-(a)
(3) (i)-(a), (ii)-(c), (iii)-(b), (iv)-(d)
(4) (i)-(a), (ii)-(b), (iii)-(d), (iv)-(c)

72.

The yellowish fluid "colostrum" secreted by mammary glands of the mother during the initial days of lactation has abundant antibodies (IgA) to protect the infant. This type of immunity is called as :
(1) Passive immunity
(2) Active immunity
(3) Acquired immunity
(4) Autoimmunity

73.

First discovered restriction endonuclease that always cuts DNA molecule at a particular point by recognizing a specific sequence of six base pairs is:
1. EcoR1
2. Adenosine deaminase
3. Thermostable DNA polymerase
4. Hind II

74.

In Recombinant DNA technology antibiotics are used :

1.	to keep medium bacteria-free
2.	to detect alien DNA
3.	to impart disease-resistance to the host plant
4.	as selectable markers

75.

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 pathogens, based on antigen-antibody reaction
(d)	ELISA	(iv)	Amplification of nucleic acids

Select the correct option from the following:

1.	(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
2.	(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
3.	(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
4.	(a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)

76.

In a mixture, DNA fragments are separated by-
(1) Bioprocess engineering
(2) Restriction digestion
(3) Electrophoresis
(4) Polymerase chain reaction

77.

Spooling is :-

1.	Amplification of DNA
2.	Cutting of separated DNA bands from the agarose gel
3.	Transfer of separated DNA fragments to synthetic membranes
4.	Collection of isolated DNA

78.

Select the correct statement from the following :

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

79.

RNA interference is used for which of the following purposes in the field of biotechnology?
(1) to develop a plant tolerant to abiotic stresses
(2) to develop a pest-resistant plant against infestation by nematode
(3) to enhance the mineral usage by the plant
(4) to reduce post-harvest losses

80.

The laws and rules to prevent unauthorized exploitation of bio-resources are termed as -
(1) Biopatenting
(2) Bioethics
(3) Bioengineering
(4) Biopiracy

81.

Match the items in Column-I with those in Column-II :
Column I Column II
(a) Herbivores-Plants (i) Commensalism
(b) Mycorrhiza-Plants (ii) Mutualism
(c) Sheep-Cattle (iii) Predation
(d) Orchid-Tree (iv) Competition
Select the correct option from following :
(1) (a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
(2) (a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
(3) (a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)
(4) (a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)

82.

The impact of immigration on population density is :-
(1) Negative
(2) Both positive and negative
(3) Neutralized by natality
(4) Positive

83.

Which of the following statements is incorrect?
(1) Biomass decreases from first to fourth trophic level
(2) Energy content gradually increases from first to fourth trophic level
(3) Number of individuals decreases from first trophic level to fourth trophic level
(4) Energy content gradually decreases from first to fourth trophic level

84.

Which of the following statements is incorrect regarding the phosphorus cycle?
(1) Phosphates are the major form of phosphorus reservoir
(2) Phosphorus solubilizing bacteria facilitate the release of phosphorus from organic remains
(3) There is the appreciable respiratory release of phosphorus into the atmosphere
(4) It is a sedimentary cycle

85.

The rate of decomposition is faster in the ecosystem due to the following factors EXCEPT:-

1.	Detritus rich in sugars
2.	Warm and moist environment
3.	Presence of aerobic soil microbes
4.	Detritus richer in lignin and chitin

86.

According to Alexander von Humboldt :
(1) Species richness decreases with increasing area of exploration
(2) Species richness increases with the increasing area, but only up to limit
(3) There is no relationship between species richness and area explored.
(4) Species richness goes on increasing with increasing area of exploration

87.

In the following, in each set, a conservation approach and an example of a method of conservation are given
(a) In situ conservation - Biosphere Reserve
(b) Ex situ conservation - Sacred groves
(c) In situ conservation - Seed bank
(d) Ex situ conservation - Cryopreservation `
Select the option with the correct match of approach and method :
(1) (a) and (c)
(2) (a) and (d)
(3) (b) and (d)
(4) (a) and (b)

88.

A species which was introduced for ornamentation but has become a troublesome weed in India :
(1) Parthenium hysterophorus
(2) Eichhornia crassipes
(3) Prosopis juliflora
(4) Trapa Spinosa

89.

Air (Prevention and Control of Pollution) Act was amended in 1987 to include among pollutants
(1) Vehicular exhaust
(2) Allergy causing pollen
(3) Noise
(4) Particulates of size 2.5 micrometer or below

90.

According to the Central Pollution Control Board [CPCB] what size (in diameter) of particulate is responsible for causing greater harm to human health?
(1) 3.5 micrometers
(2) 2.5 micrometers
(3) 4.0 micrometers
(4) 3.0 micrometers

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