NEET Biology Mock Test 1
1. Bacteria that live around deep-sea hot-water vents obtain energy by oxidising inorganic hydrogen sulphide belched out by the vents. They use this energy to build organic molecules from carbon obtained by carbon dioxide in the seawater. These bacteria might be described as
(a) photoheterotrophs
(b) chemoautotrophs
(c) photoautotrophs
(d) chemoheterotrophs
2. Read the following statements. .
I. Preganglionic nerve fibres of III, VII, IX and X cranial nerves are a part of the parasympathetic nervous / system.
II.V, VII, IX and X cranial nerves are mixed nerve’s.
III.Trochlear nerves are the largest cranial nerves.
IV.Abducens nerves are motor nerves and originate from the Gasserian ganglia. ‘
Which of the above statements are correct?
(a) I and IV
(b) I and II
(c) II and III
(d) I and III
3. Choose the correct combination of the labelling for the following structure.
(a) A-Oviduct, B-Uterus, Q-Cervix, D-Ovary
(b) A-Cervix, B-Uterus, C-Ovary, D-Tumour
(c) A-Uterus, B-Uterine cavity, C-Oviducal funnel, D-Ovary
(d) A-Cervix, B-Uterine cavity, C-Fallopian tube, D-Ovary
4. Match the following columns.
5. Assertion The biological species concept help us to know how species are formed.
Reason The concept of biological species focusses our attention on the question of how reproductive isolation comes about.
(a) Both assertion and reason are true and reason is the correct expiation of the assertion.
(b) Both assertion and reason are true, but reason is the not correct expiation of the assertion.
(c) Assertion is true ,but reason is false.
(d) Both assertion and reason are false.
6. A cell is grown in a solution containing radioactive nucleotides, so that its DNA is labelled with radioactivity. It is removed from the radioactive solution and grown in a normal medium, so that any new DNA strand it makes will not be radioactive. In the normal medium, the cell replicates its DNA and divides.
The two daughter cells also replicate their DNA and divide, producing a total of four cells. If a dotted line represents a radioactive DNA strand and a solid line represents a non-radioactive DNA strapd, which of the following depicts the DNA of the four cells?
7. Which one of the following combinations of microbes is responsible for the formation and flavour of yoghurt?
(a) Lactobacillus casei and Streptococcus thermophlllus
(b) Rhizobium meliloti and Azotobacter sp.
(c) Ectobioquerilluers ruburn and Sciencealla typhosa
(d) Bacillus subtilis and Escherichia coli
8. WBCs accumulate at site of wound by
(a) hypertension
(b) arteriosclerosis
(c) haemopoiesis
(d) diapedesis
9. Geneticists suspect that the extrachromosome seen in Down’s syndrome usually comes from the egg, rather than the sperm, because
(a) eggs are produced so rapidly that there is more chance for error
(b) Down’s syndrome is due to a dominant gene in women, a recessive gene in men
(c) most women inherit Down’s syndrome from their mothers
(d) meiosis takes longer in the ovary, increasing the likelihood of error
10. Stem cuttings are commonly used for the propagation of
(a) banana
(b) rose
(c) mango
(d) cotton
11. In fruit flies, the allele for red eyes is dominant and the allele for purple eyes is recessive. Normal gray body is dominant and black body is recessive. A geneticist mated a heterozygous red-gray male with a purple-black female. She predicted that there would be four phenotypes of offspring in equal numbers-, but she was wrong. Instead, 48% of the offspring were red-gray, 46% were purple-black, 3% were red-black and 3% were purple-gray.
She concluded that in the male, the red and gray genes were linked and in the female, the purple and black genes were linked. If this is the case, how would you account for the red-black and purple-gray offspring?
(a) This is an example of pleiotropy
(b) Body colour and eye colour are quantitative, characteristics
(c) Crossing-over during meiosis recombined the genes
(d) This cross shows incomplete dominance at work
12. In certain fungi and algae, cells undergo mitosis repeatedly without subsequently undergoing cytokinesis. What would result from this?
(a) A decrease in chromosome number
(b) Inability to duplicate DNA
(c) Division of the organism into many cells, most lacking nuclei
(d) Large cells containing many nuclei
13. Match the symbols with statement.
A. Diseased (death)
B. Carrier (female) of X-linked recessive gene
C. Marriage in blood relatives
D. Unknown sex
Codes
ABCD ABCD
(a) 1 2 3 4 (b) 6 5 7 4
(c) 2 1 3 4 (d) 6 2 3 4
14. Which of the following is not evidence for the role of endosymbiosis in the origin of eukaryotes?
(a) Chloroplasts have their own DNA
(b) The inner membrane of a chloroplast is similar to prokaryotic membranes
(c) Mitochondria and chloroplasts are surrounded by two membranes
(d) The DNA in the eukaryotic nucleus codes for some enzymes in mitochondria
15. Assertion The theory of survival of the fittest is widely misunderstood.
Reason Evolution does not always increase the chances of a species survival and species do not survive when such chances happen rapidly.
(a) Both assertion and reason are true and reason is the correct expiation of the assertion .
(b) Both assertion and reason are true, but reason is the not correct expiation of the assertion.
(c) Assertion is true ,but reason is false .
(d) Both assertion and reason are false .
16. Match the following columns.
Codes
A B C D A B C D
(a) 12 3 4 (b) 5 4 2 1
(c) 13 2 4 (d) 5 1 2 4
17. What evidence most strongly suggests that an impact by an asteroid or meteorite may have caused the extinction of the dinosaurs?
(a) Fossils show that dinosaufe suffered from cold and starvation
(b) Sedimentary rocks contain a layer of mineral uncommon on earth
(c) There have been several near misses in recent years
(d) The dinosaurs disappeared rather abruptly—virtuallyovernight
18. Devices for self-pollination are
(a) dicliny or unisexuality
(b) dichogamy
(c) heterostyly
(d) None of these
19. Assertion Epidermis in the dicot root is composed of cutinised cells.
Reason The exodermis in the root offers protection to the inner parts in the absence of epidermis.
(a) Both assertion and reason are true and reason is the correct expiation of the assertion .
(b) Both assertion and reason are true, but reason is the not correct expiation of the assertion.
(c) Assertion is true ,but reason is false .
(d) Both assertion and reason are false .
20. Read the statements regarding muscle proteins.
I. Actin is a thin filament and is made up of two F-actins.
II.The complex protein, tropomyosin is distributed at regular intervals of troponin.
III.Myosin is a thick filament, which is also a polymerised protein.
IV. The globular head of meromyosin consists of Light Meromyosin (LMM).
Which of the above statements are correct?
(a) I, II and III
(b) I, II and IV
(c) I and III
(d) II and IV
21. A single amino acid is often coded by more than ohe triplet code. In most of the cases, the first two bases are the same but the third base is different. This feature of the genetic code is called
(a) universality
(b) non-overlapping and commaless
(c) reducdancy and degeneracy
(d) non-ambiguity
22. Researchers found that when laboratory rats were already infected with a virus, they’were better able to resist infection by a second completely different virus.
The first infection apparently caused, whichprotected the rats from the second infection.
(a) increased stress
(b) secretion of interferons
(c) production of antibodies
(d) passive immunity
23. In the diagram of lenticel, identify the parts indicated as A, B, C and D.
(a) A-Phellem, B-Complementary cells, C-Phellogen, D-Phelloderm
(b) A-Pheriem, B-Complementary cells, C-Phelloderm, D-Periderm
(c) A-Complementary cells, B-Phellogen, C-Phelloderm,D-Periderm
(d) A-Complementary cells, B-Phellem, C-Periderm, D-Phelloderm
24. The wall of bacteria consists of
(a) N-acetylglucosamine
(b) N-acetyl muramic acid
(c) Both (a) and (b)
(d) Cellulose
25. Refer the following features.
I. Adenohypophysis produces gonadotrophins.
II. Besides sex cells, hormones are also produced by testis and ovary.
III. Testosterone is produced by Leydig’s cells.
IV. Oestrogen is produced by ovary.
Which of the above factors influence secondary sexual characters?
(a)III and IV
(b) II, III and IV
(c) II and III
(d) I, II, III and IV
26. A plant cell was grown in a test tube containing . radioactive nucleotides, the parts from which DNA isbuilt. Later examination of the cell showed the radioactivity to be concentrated in the
(a) rough ER
(b) Golgi apparatus
(c) smooth ER
(d) nucleus
27. Peyer’s patches produce
(a) mucus
(b) trypsin
(c) lymphocytes
(d) enterokinase
28. A chemist has discovered a drug that blocks glucose phosphate isomerase, an enzyme that catalyses the second reaction in glycolysis. He wants to use the drug to kill bacteria in people with infections. But he can’t do this because
(a) bacteria are facultative anaerobes; they usually don’t need to do glycolysis
(b) glycolysis produces so little ATP that the drug will have little effect
(c) human cells also do glycolysis; the drug might also poison them
(d) bacteria do not perform glycolysis
29. Consider the following statement about plasmodesmata
I. These are fine strands of cytoplasm through which ‘ the adjacent cells remains interconnected in plants and animals body.
II. The plasmodesmata were”first discovered by Tangel (1879) and by Strasburger (1882),
Which of the above statement (s) is/are correct?
(a) Only I
(b) Only II
(c) I and II
(d) Neither I nor II
30. Cross Over Value (COV) are given for linked gene pair.
Linked Gene Pair Cross Over Value (COV)
Find out the sequence of genes in the chromosome.
(a) VTWU
(b) TVWU
(c) TWVU
(d) VWTU
31. The world’s highly priced wool ‘Pashmina’ is yielded from the breed of
(a) sheep
(b) goat
(c) goat-sheep cross
(d) Kashmiri sheep-Afghan sheep cross
32. The disease in poultry, which reduces immunity and spreads through contaminated food is
(a) Ranikhet disease
(b) aflatoxicosis
(c) thrush
(d) Marek’s disease
33. Match the following columns.
34.Researchers studying the effects of toxic wastes knew that animals were poisoned by the heavy metal cadmium, but they wanted to know, where cadmium accumulated in the body. They could find out by
(a) tracing the movement of cadmium isotopes in test animals
(b) measuring the size of cadmium atoms
(c) finding out whether cadmium atoms form ionic or covalent bonds
(d) finding out whether cadmium is acidic in water
35. Identify which of the following phyla is correctly matched with its two general characteristics.
(a) Echinodermata-pentamerous, radial symmetry and mostly internal fertilisation
(b) Mollusca-normally oviparous and development through a trochophore or veliger larva
(c) Arthropoda-body divided into head, thorax and abdomen and respiration by trachea
(d) Chordata-notochord at some stage and separate anal and urinary opening to the outside
36. Which of the following statements is correct regarding hypothalamic control of pituitary function?
(a) All the hypothalamic hormones are synthesised and secreted by neurons
(b) Blood flows from the anterior pituitary to the hypothalamus in the portal vessels
(c) The hypothalamic releasing hormones reach the general circulation in significant amount
(d) Loss of dopaminergic neurons in the hypothalamus is likely to lead to a fall in the secretion of prolactin
37. The body produces antibodies complementary to foreign antigens. The process by which the body comes up with the correct antibodies to a given disease is most like
(a) going to a tailor and having a suit made to fit you
(b) ordering the lunch special at a restaurant without looking at the menu
(c) going to a shoe store and trying on shoes until you find a pair that fits
(d) picking out a video that you haven’t seen yet
38. In the given diagram, different parts are indicated by alphabets. Choose the answer, in which these alphabets correctly match with the parts they indicate.
(a) A-Rostellum C-Sucker
(b) A-Suctorial mouth C-Sucker
(c) A-Mouth C-Sucker
(d) A-Sucker C-Ring
39. Imagine that you have eaten a meal containing different nutrients. Which would not have to be digested before being absorbed?
(a) Protein
(b) Polysaccharide
(c) Disaccharide
(d) Amino acid
40. Why is vivipary an undesirable character for annual crop plants?
(a) It reduces the vigour of plant
(b) The seeds cannot be stored under normal conditions for the next season
(c) The seeds exhibit long dormancy
(d) It adversely affects the fertility of the plant
41. Which of the following discoveries resulted in a Nobel Prize?
(a) Recombination of linked genes
(b) Genetic engineering
(c) X-rays induce sex-linked recessive lethal mutations
(d) Cytoplasmic inheritance
42. Synthesis of RNA molecule is terminated by a signal which is recognised by
(a) a (alpha) factor
(b) y (gamma) factor
(c) p (rho) factor
(d) S (delta) factor
43. Which of the following constitutes for lymph?
(a) WBCs and serum
(b) All components of blood except RBCs and some proteins
(c) RBCs, WBCs and plasma
(d) RBCs, proteins and platelets
44. Biological equilibrium is found among the
(a) producers, consumers and decomposers
(b) producers and consumers
(c) producers and decomposers
(d) None of the above
45. Match the following columns.
Codes
A B C D E
(a) 1 2 3 5 4
(b) 3 1 4 2 5
(c) 3 1 2 5 4
(d) 2 4 3 5 1
Answers :
