NEET Practice Test Paper 9 Biology by TEACHING CARE online tuition and coaching classes

                          Mock Test

1. Two genes R and Y are located very close on the chromosomal linkage map of maize plant. When RRYY and rryy genotypes are hybridized, the F2 segregation will show:
2. Higher number of the parental types.
3. Higher number of the recombinant types.
4. Segregation in the expected 9: 3: 3: 1 ratio.
5. Segregation in 3:1 ratio.

ANSWER: A

B

2. In maize, hybrid vigour is exploited by:
3. Inducing mutations.
4. Bombarding the seeds with DNA.
5. Crossing of two inbred parental lines.
6. Harvesting seeds from the most productive plants.

ANSWER: C

B

3. Differentiation of organs and tissues in a developing organism, is associated with:
4. Deletion of genes
5. Developmental mutations
6. Differential expression of genes
7. Lethal mutations

ANSWER: C

B

	4.	During transcription, hydrogen bonds form between which of the following? a. amino acid pairs c. mRNA and ribosomes b. mRNA and DNA d. sugar and phosphate molecules   ANSWER:  B B
	5.	Which of the following describes the fluid-mosaic model of a cell membrane? a. phospholipids floating in a layer of glycoproteins b. cholesterol embedded between a double layer of protein c. a layer of protein molecules between two layers of cellulose d. protein molecules embedded in a double layer of phospholipids   ANSWER:  D B
	6.	Which of the following is an example of osmosis? a. the absorption of water by the large intestine b. the absorption of amino acids by the small intestine c. the movement of carbon dioxide into the blood from the tissues d. the movement of fluids from the glomerulus to Bowman’s capsule   ANSWER:  A B
	7.	Which of the following processes results in the production of ADP and phosphate? a. the absorption of water by the large intestine b. the absorption of oxygen into the blood by the alveoli c. the movement of carbon dioxide from the tissues to the blood d. the re-absorption of glucose by the proximal convoluted tubule   ANSWER:  D Z
	8.	What process allows chloride ions to move into a cell without the use of energy? a. osmosis c. active transport b. endocytosis d. facilitated transport   ANSWER:  D Z
	9.	What occurs when a cell is placed in a solution that has a higher concentration of solute than its cytoplasm? a. The volume of the cell increases. b. More solute diffuses out of the cell. c. More water leaves the cell than enters the cell. d. The concentration of solute in the cell decreases.   ANSWER:  C Z
	10.	How do enzymes increase the rate of a reaction? a. They produce energy. b. They become denatured. c. They produce coenzymes. d. They decrease the energy of activation.   ANSWER:  D Z
	11.	Why does maltase hydrolyze maltose but not starch? a. Maltose is a vitamin. b. Starch denatures the tertiary structure of maltase. c. The active site of maltase is complementary to maltose. d. Maltose provides activation energy and starch does not.   ANSWER:  C Z
	12.	How are coenzymes involved in enzymatic reactions? a. They provide atoms for the reaction. b. They increase enzyme concentration. c. They provide energy for the reaction. d. They increase substrate concentration.   ANSWER:  A Z 13. The two polynucleotide chains in DNA are: a.     semiconservative b.     parallel c.      discontinuous d.     antiparallel ANSWER: D B 14. A plant requires magnesium for: a.     Cell wall development b.     Holding cells together c.      Protein synthesis d.     Chlorophyll synthesis ANSWER: C B 15. Probiotics are: a.     Live microbial food supplement b.     Safe antibiotics c.      Cancer inducing microbes d.     New kind of food allergens ANSWER: A B 16. Bowman’s glands are located in the: a.     olfactory epithelium of our nose b.     proximal end of uriniferous tubules c.      anterior pituitary d.     female reproductive system of cockroach ANSWER: A Z 17. Increased asthamatic attacks in certain seasons are related to: a.     Low temperature b.     Hot and humid environment c.      Eating fruits preserved in tin containers d.     Inhalation of seasonal pollen ANSWER: D Z
	18.	What is the function of thyroxin? a. to cause ovulation b. to increase metabolic rate c. to decrease the rate of digestion d. to control the concentration of sodium ions in the blood   ANSWER:  B Z
	19.	What two structures produce chemicals that digest proteins? a. the liver and the pancreas b. the salivary and intestinal glands c. the gastric glands and the pancreas d. the gastric glands and the gall bladder   ANSWER:  C Z
	20.	Which of the following is not produced in the liver? a. bile b. urea c. lipase d. glycogen   ANSWER:  C Z
	21.	When the liver is unable to break down red blood cells, which of the following would be produced in decreased amounts? a. maltose b. peptides c. fat droplets d. nucleotides   ANSWER:  C Z
	22.	What blood vessel supplies blood directly to the heart muscle? a. the aorta c. the coronary artery b. the carotid artery d. the pulmonary artery   ANSWER:  C Z
	23.	Where does lymphatic fluid enter the bloodstream? a. the aorta c. the subclavian vein b. the jugular vein d. the pulmonary vein   ANSWER:  C Z
	24.	Which vessel contains blood with the lowest concentration of dissolved carbon dioxide? a. the aorta c. the pulmonary vein b. the carotid artery d. the inferior vena cava   ANSWER:  C Z
	25.	What structure does blood flow through immediately after leaving the right ventricle? a. the aorta c. the pulmonary vein b. the AV valve d. the pulmonary trunk   ANSWER:  D Z
	26.	Which of the following directs mucus towards the pharynx? a. cilia in the trachea c. elastic fibres in the larynx b. cartilage in the bronchi d. lipoprotein layer in the alveoli   ANSWER:  A Z
	27.	Which reaction occurs at the pulmonary capillaries and alveoli? a. H+ + Hb HHb c. CO2 + Hb HbCO2 b. HbO2 O2 + Hb d. H+ + HCO3– CO2 + H2O   ANSWER:  D Z
	28.	Which of the following structures is found only in the central nervous system? a. the axon of an interneuron c. the dendrite of a sensory neuron b. the axon of a motor neuron d. the cell body of a sensory neuron   ANSWER:  A Z
	29.	What does the term “threshold” refer to during synaptic transmission? a. the number of impulses in a given unit of time b. the amount of stimulus required to cause depolarization c. the maximum number of sodium ions that can exit the axon d. the maximum time neurotransmitters spend in the synaptic cleft   ANSWER:  B Z
	30.	What process ensures that a greater concentration of sodium ions is maintained outside the axon relative to the inside of the axon? a. diffusion through sodium channels b. transport by carriers and the use of ATP c. exocytosis due to infolding of the membrane d. facilitated transport by sodium-potassium carriers   ANSWER:  B Z
	31.	What structure insulates nerve fibres and speeds up the conduction of a nerve impulse? a. the cell body c. the myelin sheath b. the dendrites d. the nodes of Ranvier   ANSWER:  C Z 32. Which one of the following pairs is mismatched? a.     Bombyx mori b.     Pila globosa c.      Apis indica d.     Kenia lacca -silk -pearl –honey –lac ANSWER: B B 33. Which one of the following is viral disease of poultry? a.     Pasteurellosis b.     Salmonellosis c.      Coryza d.     New Castle disease ANSWER: D B 34. Ultrasound of how much frequency is beamed into human body for sonography? a.     45 – 70 MHz b.     30 – 45 MHz c.      15 – 30 MHz d.     1 – 15 MHz ANSWER: D B 35. Lysozyme that is present in perspiration, saliva and tears, destroys: a.     most virus-infected cells b.     certain fungi c.      certain types of bacteria d.     all viruses ANSWER: C B 36. Which part of ovary in mam mals acts as an endocrine gland after evolution? a.     Vitelline membrane b.     Graafian follicle c.      Stroma d.     Germinal epithelium ANSWER: B Z 37. During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric charge? a.     First positive, then negative and again back to positive b.     First negative, then positive and again back to negative c.      First positive, then negative and continue to be negative d.     First negative, then positive and continue to be positive.  ANSWER: B Z
	38.	The autonomic nervous system includes a. the brain and spinal cord. b. the somatic nervous system. c. the cerebellum and the medulla oblongata. d. the sympathetic and parasympathetic divisions.   ANSWER:  D
		Z
	39.	Where is the loop of Henle located? a. in the renal cortex c. in the collecting duct b. in the renal medulla d. in the Bowman’s capsule   ANSWER:  B Z
	40.	Where do large amounts of Na+ and Cl– enter into the renal medulla? a. at the loop of Henle c. at the Bowman’s capsule b. at the collecting duct d. at the proximal convoluted tubule   ANSWER:  A Z
	41.	What structure transfers sperm to the female? a. penis c. prostate b. testes d. epididymis   ANSWER:  A Z
	42.	What substance causes the secretion of both testosterone and progesterone? a. luteinizing hormone b. antidiuretic hormone c. follicle-stimulating hormone d. human chorionic gonadotropic hormone   ANSWER:  A Z
	43.	What are days 5 to 13 of the uterine cycle called? a. the luteal phase c. the secretory phase b. the follicular phase d. the proliferation phase   ANSWER:  D Z
	44.	What is an effect of oxytocin? a. release of an egg c. loss of the endometrium b. development of breasts d. contraction of the uterus   ANSWER:  D Z
	45.	What is a function of estrogen on the female reproductive system? a. rupturing of the follicle b. thickening of the uterine lining c. maturation of the corpus luteum d. degeneration of the endometrium   ANSWER:  B

Z

46. Which of the following molecules is a monomer of lipids?

a.	glycogen	c.	amino acid
b.	glycerol	d.	cholesterol

 

ANSWER:

B

B

47. Which of the following is the second step of replication?

a.	the joining of bonds between the sugar and phosphate backbone
b.	complementary base pairing of nitrogenous bases
c.	the formation of two new DNA molecules
d.	the breaking of hydrogen bonds between nitrogenous bases

 

ANSWER:	B

 

B

48. What is the semi-liquid material that surrounds the organelles of a cell?

a.	the chromatin	c.	the endoplasmic reticulum
b.	the cytoskeleton	d.	the cytoplasm

 

ANSWER:

D

B

49. Hydrogen bonding accounts for which of the following properties of water?

a.	its neutral pH
b.	it acts as a reactant in hydrolysis
c.	its increased density when frozen
d.	its capacity to store large amounts of heat

 

ANSWER:

D

 

B

50. DNA is a molecule of which of the following?

a.	amino acids	c.	nucleic acids
b.	nucleotides	d.	ribose

 

ANSWER:

B

B

51. Which of the following are characteristics of a DNA molecule?

a.	double helix, ribose, adenine	c.	double helix, deoxyribose, thymine
b.	single helix, ribose, guanine	d.	single helix, deoxyribose, uracil

 

ANSWER:

C

B

52. Which one of the following ecosystem types has the highest annual net primary productivity?
53. Temperate deciduous forest
54. Tropical rain forest
55. Tropical deciduous forest
56. Temperate evergreen forest

ANSWER: B

B

53. Which one of the following is being utilized as a source of biodiesel in the Indian countryside?
54. Pongamia
55. Euphorbia
56. Beetroot
57. Sugarcane

ANSWER: A

B

54. In a coal fires power plant electrostatic precipitators are installed to control emission of:
55. CO
56. SO₂
57. NO_X
58. SPM

ANSWER: D

B

55. Which one of the following is not a bioindicator of water pollution?
56. Sewage fungus
57. Sludge-worms
58. Blood-worms
59. Stone flies

ANSWER: D

B

56. A high density of elephant population in an area can result in:
57. Predation on one another
58. Mutualism
59. Intra specific competition
60. Inter specific competition

ANSWER: C

B

57. Geometric representation of age structure is a characteristic of:
58. Ecosystem
59. Biotic community
60. Population
61. Landscape

ANSWER: C

B

58. Which of the following is a step in transcription?

a.	Hydrogen bonds are broken to expose a section of the DNA helix.
b.	Adenine in DNA bonds to thymine in mRNA.
c.	Amino acids are joined by peptide bonds.
d.	Ribosomes move along mRNA.

 

ANSWER:

A

B

59. Cholesterol molecules are synthesized in liver cells and packaged as LDLs (low-density lipoproteins). The LDLs are released into the blood. Which of the following is the process by which LDLs re-enter body cells from the blood?

a.	facilitated diffusion	c.	osmosis
b.	exocytosis	d.	endocytosis

 

ANSWER:

D B

24. Which of the following increases the rate of diffusion in cells?

a.	an increase in temperature from 40°C to 90°C
b.	increased surface area to volume ratio
c.	decreased folding of the cell membrane
d.	a decrease in the concentration gradient

 

ANSWER:

B B

 

60. Which of the following attaches to a protein to catalyze a metabolic reaction?

a.	a heavy metal	c.	a competitive inhibitor
b.	an enzyme	d.	a coenzyme

 

ANSWER:

D B

 

 

61. Which of the following decreases the rate of an enzyme-catalyzed reaction in the body?

a.	adding more substrate
b.	maintaining optimum pH
c.	adding more enzyme
d.	changing the temperature from 37°C to 10°C

 

ANSWER:

D Z

 

62. What is a function of tRNA?

a.	to carry amino acids to the growing polypeptide chain
b.	to carry genetic information from the nucleus to the cytoplasm
c.	to provide a location for translation
d.	to produce mRNA
ANSWER:	A B

 

 

63. Which of the following is an example of active transport?

a.	carbon dioxide moving into the blood from the tissues
b.	oxygen moving out of the alveoli into the pulmonary capillaries
c.	potassium ions moving back into the cytoplasm of a neuron
d.	water moving into cells when they are placed in a hypotonic solution

 

ANSWER:

C B

 

64. What hormone causes the metabolic rate of body cells to increase?

a.	ADH	c.	thyroxin
b.	oxytocin	d.	aldosterone

 

ANSWER:

C

Z

65. Which of the following may be found in a person’s stomach after they have eaten a meal?

a.	starch, glycerol, amylase and trypsin
b.	protein, pepsin, hydrochloric acid and maltose
c.	hydrochloric acid, peptides, bicarbonate ions and nuclease
d.	water, salts, maltase and bile

 

ANSWER:

B

Z

66. Blood enters the iliac artery from which of the following vessels?

a.	the aorta	c.	the carotid artery
b.	the coronary artery	d.	the renal artery

 

ANSWER:

A Z

67. Which of the following would require the greatest activity in the cerebellum?

a.	smelling freshly baked bread	c.	adding numbers in your head
b.	performing a gymnastics routine	d.	recalling a memory

 

ANSWER:

B

Z

68. What part of the brain receives sensory information and sends it to the appropriate areas
    of the cerebrum?

a.	the thalamus	c.	the cerebellum
b.	the corpus callosum	d.	the hypothalamus

 

ANSWER:

A

Z

69. To what part of the kidney is the ureter attached?

a.	the renal medulla	c.	the renal pelvis
b.	the nephron	d.	the renal cortex

 

ANSWER:

C

Z

70. Where do sperm become motile?

a.	the seminal vesicles	c.	the vas deferens
b.	the prostate gland	d.	the epididymis

 

ANSWER:

D

Z

71. Which of the following hormones acts on the testes?

a.	human chorionic gonadotropin	c.	GnRH
b.	luteinizing hormone	d.	ADH

 

ANSWER:

B

Z

72. Which of the following is a consequence of increased secretions of progesterone?

a.	the maturation of the follicle
b.	the release of the ova
c.	a decrease in luteinizing hormone
d.	an increase in follicle-stimulating hormone

 

ANSWER:

C Z

 

73. Where does the chemical digestion of protein occur?

a.	in the pancreas and in the small intestine
b.	in the stomach and in the small intestine
c.	in the mouth and in the stomach
d.	in the pancreas and in the large intestine

 

ANSWER:

B

Z

74. Which of the following is a result of increased secretion by the liver?

a.	a decreased level of blood glucose
b.	an increased concentration of glycerol in the duodenum
c.	a decreased secretion of insulin by the pancreas
d.	an increased concentration of amino acids in the hepatic portal vein

 

ANSWER:

B

Z

75. What structure closes the trachea when a person swallows?

a.	the larynx	c.	the epiglottis
b.	the pharynx	d.	the glottis

 

ANSWER:

C

Z

76. Which of the following occurs during inhalation?

a.	The intercostal muscles relax and the diaphragm relaxes.
b.	The intercostal muscles relax and the diaphragm contracts.
c.	The intercostal muscles contract and the diaphragm relaxes.
d.	The intercostal muscles contract and the diaphragm contracts.

 

ANSWER:

D

Z

77. What part of the brain controls inhalation?

a.	the cerebrum	c.	the cerebellum
b.	the corpus callosum	d.	the medulla oblongata

 

ANSWER:

D

Z

78. Which of the following decreases as carbon dioxide enters the blood during internal respiration?

a.	bicarbonate ions	c.	water
b.	hydrogen ions	d.	reduced hemoglobin

 

ANSWER:

C Z

79. What is the function of acetylcholinesterase?

a.	to cause contractile proteins to shorten
b.	to break down neurotransmitter molecules
c.	to fit into receptor sites
d.	to act as a carrier molecule

 

ANSWER:

B

Z

80. What is the first component of a reflex arc?

a.	a motor neuron	c.	a sensory neuron
b.	a muscle	d.	a sensory receptor

 

ANSWER:

D Z

81. How does aldosterone increase blood pressure?

a.	It causes increased reabsorption of sodium ions.
b.	It causes the excretion of water at the distal convoluted tubule.
c.	It causes the excretion of potassium ions.
d.	It causes increased permeability of the collecting duct to water.

 

ANSWER:

A Z

 

 

82. Protistan genome has

  (a) membrane bound nucloeoproteins embedded in cytoplasm

(b) free nucleic acid aggregates

(c) gene containing nucleoproteins  condensed together in loose mas s

(d) nucleoprot ein in direct contact with cell substance

ANSWER:

A Z

 

83. Entamoeba coli causes

(a) pyorrhea  (b) diarrhoea

(c) dysentery  (d) None of these

ANSWER:

D

Z

84. Interferon’s are synthesized in response to

(a) mycoplasma

(b) bacteria

(c) viruses

(d) fungi

ANSWER:

C

B

85. What is true for archaebacteria?

(a) All halophiles (b) All photosynthetic

(c) All fossils      (d) Oldest living beings

ANSWER:

D

B

86. Cauliflower mosaic virus contains

(a) ssRNA   (b) dsRNA

(c) dsDNA    (d) ssDNA

ANSWER:

C

B

87. Cell recognition and adhesion occur due to biochemical’s of cell membranes named

(a) proteins                    (b) lipids

(c) proteins and lipids  (d) glycoproteins and glycolipids

ANSWER:

D

B

88. Genophore/bacterial genome or nucleoid is made of

(a) histones and non-hist ones  (b) RNA and histones

  (c) a single double stranded DNA  (d) a single stranded DNA

ANSWER:

C

B

89. A dental disease characterised by moltting of teeth is due to the presence of a certain chemical element in drinking water. Which of the following is that   element?

(a) Mercury   (b) Chlorine

(c) Fluorine   (d) Boron

ANSWER:

C

B

90. The enzyme enterokinase helps in the conversion of

(a) pepsinogen into pepsin

(b) trypsinogen into trypsin

(c) caseinogen into casein

(d) proteins into polypeptides

ANSWER:

B

Z

91. Which one of the following contains the largest quantity of  extracellular material?

(a) Myelinated nerve fibres (b) Striated muscle

(c) Areolar tissue                (d) Stratified epithel ium

ANSWER:

C

Z

92. Mast cells of connective tissue contain

(a) vasopressin and relaxin

  (b) heparin and histamine

(c) heparin and  calcitonin

(d) serotonin and melanin

ANSWER:

B

Z

93. In salivary gland chromosomes/polytene chromosomes pairing is

(a) absent

(b) occasional

(c) formed between non-homologous chromosomes

(d) formed between homologous  chromosomes

ANSWER:

D

B

94. Which type of white blood cells are concerned with the release of   histamine and the natural  anticoagulant heparin?

(a) Neutrophils  (b) Basophils

(c) Eosinophils  (d) Monocytes

Z

95. Which one of the following is a fat-soluble vitamin and it’s   related deficiency disease ?

(a) Ascorbic acid —-Scurvy

(b) Retinol—   Xerophthalmia

(c) Cobalamine — Beri-beri

(d) Calciferol —  Pellagra

ANSWER:

B

Z

96. Lampbrush chromosomes occur during

(a) prophase of mitosis     (b) diplotene of meiosis

(c) metaphase of meiosis  (d) interphase

ANSWER:

B

B

97. Which one of the following structures will not be common to mitotic cells of higher plants?

(a) Cell plate      (b) Centriole

(c) Centromere  (d)  Spindle fibres

ANSWER:

D

B

98. Genes located on mitochondrial DNA

(a) generally show maternal inheritance

(b) are always inherited from the male parent

(c) show biparental inheritance like the nuclear genes

(d) are not inherited

ANSWER:

A

B

99. During cell division in apical meristem the nuclear membrane appears in

(a) metaphase       (b) anaphase

(c) telophase         (d) cytokinesis

ANSWER:

C

B

100. The nature of climax community ultimately depends on

(a) climate             (b) bed rock

(c) soil organisms (d) pool of available nutrients

ANSWER:

A

 

B

 

Hints and solutions:

8 Facilitated diffusion (also known as facilitated transport or passive-mediated transport) is a process of passive transport, facilitated by integral proteins. Facilitated diffusion is the spontaneous passage of molecules or ions across a biological membrane passing through specific transmembrane integral proteins. The facilitated diffusion may occur either across biological membranes or through aqueous compartments of an organism

31 Nodes of Ranvier are the gaps (approximately 1 micrometer in length) formed between the myelin sheaths generated by different cells. A myelin sheath is a many-layered coating, largely composed of a fatty substance called myelin, that wraps around the axon of a neuron and very efficiently insulates it. At nodes of Ranvier, the axonal membrane is uninsulated and therefore capable of generating electrical activity.

48 Chromatin is the combination of DNA, histone, and other proteins that makes up chromosomes. It is found inside the nuclear envelope of eukaryotic cells. It is divided between heterochromatin (condensed) and euchromatin (extended) forms.

60 In competitive inhibition, at any given moment, the enzyme may be bound to the inhibitor, the substrate, or neither, but it cannot bind both at the same time.

68 The corpus callosum (Latin: tough body), also known as the colossal commissure, is a wide, flat bundle of neural fibers beneath the cortex in the eutherian brain at the longitudinal fissure. It connects the left and right cerebral hemispheres and facilitates interhemispheric communication. It is the largest white matter structure in the brain, consisting of 200–250 million contralateral axonal projections.

95 Vitamin B12, also called cobalamin, is one of 8 B vitamins. All B vitamins help the body convert food (carbohydrates) into fuel (glucose), which is “burned” to produce energy. These B vitamins, often referred to as B complex vitamins, also help the body metabolize fats and protein.

97 Cytokinesis in terrestrial plants occurs by cell plate formation. This process entails the delivery of Golgi-derived and endosomal vesicles carrying cell wall and cell membrane components to the plane of cell division and the subsequent fusion of these vesicles within this plane.