NEET 2016 Biology Solved Paper Phase-1 - NEET and AIPMT Biology Solved Papers

Q1. Which of the following most appropriately describes haemophilia ?

Correct Answer: (b)
Haemophilia is an X-linked recessive genetic disorder.

Q2. The standard petal of a papilionaceous corolla is also called :

Correct Answer: (c)
The largest posterior petal is the Vexillum (Standard).

Q3. Which of the following statements is wrong for viroids ?

Correct Answer: (d)
Viroids have RNA of low molecular weight.

Q4. Which is the National Aquatic Animal of India ?

Correct Answer: (b)
The Gangetic River Dolphin is the national aquatic animal.

Q5. Joint Forest Management Concept was introduced in India during :

Correct Answer: (c)
JFM was introduced by the Govt. of India in the 1980s.

Q6. Emerson’s enhancement effect and Red drop have been instrumental in the discovery of :

Correct Answer: (b)
These effects proved that two photosystems work in tandem.

Q7. Tricarpellary, syncarpous gynoecium is found in flowers of :

Correct Answer: (a)
Liliaceae typically has a tricarpellary syncarpous ovary.

Q8. Blood pressure in the pulmonary artery is :

Correct Answer: (c)
Arterial pressure is always higher than venous pressure in the same circuit.

Q9. Which of the following is not a feature of the plasmids ?

Correct Answer: (d)
Plasmids are double-stranded DNA molecules.

Q10. Analogous structures are a result of :

Correct Answer: (b)
Analogous organs arise from convergent evolution due to similar environments.

Q11. Which of the following features is not present in the Phylum - Arthropoda ?

Correct Answer: (c)
Parapodia are found in Annelida, not Arthropoda.

Q12. Changes in GnRH pulse frequency in females is controlled by circulating levels of :

Correct Answer: (a)
Ovarian steroids provide feedback to the hypothalamus.

Q13. Spindle fibres attach on to :

Correct Answer: (b)
Spindle fibres attach to the kinetochore protein discs.

Q14. In a chloroplast the highest number of protons are found in :

Correct Answer: (b)
Protons accumulate in the lumen of thylakoids during light reaction.

Q15. Which of the following approaches does not give the defined action of contraceptive ?

(1) Barrier methods	prevent fertilization
(2) Intra uterine devices	increase phagocytosis of sperms, suppress sperm motility
(3) Hormonal contraceptives	Prevent/ retard entry of sperms, prevent ovulation
(4) Vasectomy	prevents spermatogenesis

Correct Answer: (d)
Vasectomy prevents sperm transport, not the production of sperm (spermatogenesis).

Q16. The coconut water from tender coconut represents :

Correct Answer: (d)
Tender coconut water is free-nuclear endosperm.

Q17. In context of Amniocentesis, which of the following statement is incorrect ?

Correct Answer: (d)
Amniocentesis cannot detect structural defects like cleft palate.

Q18. Name the chronic respiratory disorder caused mainly by cigarette smoking :

Correct Answer: (a)
Emphysema is a chronic disorder caused by cigarette smoking.

Q19. Which one of the following statements is not true ?

Correct Answer: (a)
Tapetum provides nourishment; the endothecium helps in dehiscence.

Q20. Which of the following characteristic features always holds true for the corresponding group of animals ?

(1) Cartilaginous endoskeleton	Chondrichthyes
(2) Viviparous	Mammalia
(3) Mouth with upper/lower jaw	Chordata
(4) 3-chambered heart	Reptilia

Correct Answer: (a)
Chondrichthyes always have cartilaginous skeletons. Other groups have exceptions (e.g., Platypus is oviparous).

Q21. Gause’s principle of competitive exclusion states that :

Correct Answer: (c)
Gause's principle states that two species competing for the same limiting resource cannot coexist.

Q22. Select the incorrect statement :

Correct Answer: (c)
Gonadotropins (LH/FSH) increase, not decrease, during the follicular phase.

Q23. The taq polymerase enzyme is obtained from :

Correct Answer: (a)
Taq polymerase is isolated from the thermophilic bacterium Thermus aquaticus.

Q24. Asthma may be attributed to :

Correct Answer: (b)
Asthma is an allergic response causing bronchospasm.

Q25. Fertilization in humans is practically feasible only if :

Correct Answer: (b)
Transport must be simultaneous to the ampullary-isthmic junction.

Q26. Which of the following features is not present in Periplaneta americana ?

Correct Answer: (b)
Insects have determinate and spiral cleavage.

Q27. Photosensitive compound in human eye is made up of :

Correct Answer: (b)
Rhodopsin consists of Opsin and Retinal.

Q28. Which of the following is required as inducer(s) for the expression of Lac operon ?

Correct Answer: (c)
Lactose acts as the inducer for Lac operon.

Q29. Proximal end of the filament of stamen is attached to the :

Correct Answer: (d)
Filaments attach to the thalamus or the petals in epipetalous flowers.

Q30. Pick out the correct statements :
(a) Haemophilia is a sex-linked recessive disease.
(b) Down's syndrome is due to aneuploidy.
(c) Phenylketonuria is an autosomal recessive gene disorder.
(d) Sickle cell anaemia is an X - linked recessive gene disorder.

Correct Answer: (d)
Sickle cell is autosomal, not X-linked. a, b, c are correct.

Q31. A complex of ribosomes attached to a single strand of RNA is known as :

Correct Answer: (a)
A string of ribosomes on mRNA is called a polysome or polyribosome.

Q32. A typical fat molecule is made up of :

Correct Answer: (b)
A triglyceride consists of one glycerol backbone esterified to three fatty acids.

Q33. The Avena curvature is used for bioassay of :

Correct Answer: (c)
Avena curvature test is the bioassay for Auxin (IAA).

Q34. In which of the following, all three are macronutrients ?

Correct Answer: (d)
Nitrogen and phosphorus are macronutrients; official key marks this as a bonus/4.

Q35. In higher vertebrates, the immune system can distinguish self-cells and non-self. If this property is lost due to genetic abnormality and it attacks self-cells, then it leads to :

Correct Answer: (c)
Loss of self-recognition leads to auto-immune diseases.

Q36. Microtubules are the constituents of :

Correct Answer: (b)
Microtubules make up the cytoskeleton of spindle fibers, cilia, and centrioles.

Q37. Which of the following is the most important cause of animals and plants being driven to extinction ?

Correct Answer: (c)
Habitat loss is the primary driver of extinction.

Q38. Antivenom injection contains preformed antibodies while polio drops that are administered into the body contain :

Correct Answer: (d)
Polio vaccine (OPV) contains attenuated (weakened) live viruses.

Q39. Which one of the following statements is wrong ?

Correct Answer: (c)
Eubacteria are 'true' bacteria, not false bacteria.

Q40. Identify the correct statement on 'inhibin' :

Correct Answer: (b)
Inhibin is produced by granulose cells (females) or Sertoli cells (males) and inhibits FSH.

Q41. Which part of the tobacco plant is infected by Meloidogyne incognita ?

Correct Answer: (d)
This nematode infects the roots of tobacco plants.

Q42. The two polypeptides of human insulin are linked together by :

Correct Answer: (d)
Human insulin has two peptide chains (A and B) linked by disulphide bridges.

Q43. Mitochondria and chloroplast are :
(a) semi-autonomous organelles.
(b) formed by division of pre-existing organelles and they contain DNA but lack protein synthesizing machinery.
Which one of the following options is correct ?

Correct Answer: (c)
Organelles have their own DNA and ribosomes (machinery).

Q44. A system of rotating crops with legume or grass pasture to improve soil structure and fertility is called :

Correct Answer: (a)
Ley farming improves soil structure by rotating with grass/legumes.

Q45. Which of the following pairs of hormones are not antagonistic (having opposite effects) to each other ?

Correct Answer: (d)
Relaxin and Inhibin do not have antagonistic functions.

Q46. Match the terms in Column I with their description in Column II and choose the correct option :

(a) Dominance	(i) Many genes govern a single character
(b) Codominance	(ii) In a heterozygous organism only one allele expresses itself
(c) Pleiotropy	(iii) In a heterozygous organism both alleles express themselves fully
(d) Polygenic inheritance	(iv) A single gene influences many characters

Correct Answer: (b)
Correct biological definitions of inheritance patterns.

Q47. One of the major components of cell wall of most fungi is :

Correct Answer: (a)
Fungal cell walls are made of chitin.

Q48. In meiosis crossing over is initiated at :

Correct Answer: (a)
Crossing over occurs during the Pachytene stage of Prophase I.

Q49. In mammals, which blood vessel would normally carry largest amount of urea ?

Correct Answer: (c)
Urea is produced in the liver and exits via the hepatic vein.

Q50. Which of the following is wrongly matched in the given table ?

Microbe	Product	Application
(1) Trichoderma	Cyclosporin A	immunosuppressant
(2) Monascus	Statins	lowering cholesterol
(3) Streptococcus	Streptokinase	removal of clot
(4) Clostridium	Lipase	removal of oil stains

Correct Answer: (d)
Lipase is produced by Candida or Aspergillus; Clostridium is used for Butyric acid.

Q51. A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F1 plants were selfed the resulting genotypes were in the ratio of :

Correct Answer: (a)
The genotypic ratio of a monohybrid cross is 1:2:1.

Q52. Which one of the following is a characteristic feature of cropland ecosystem ?

Correct Answer: (b)
Artificial ecosystems like croplands have low genetic diversity.

Q53. Which of the following guards the opening of hepatopancreatic duct into the duodenum ?

Correct Answer: (d)
The Sphincter of Oddi regulates the flow of bile and pancreatic juice into the duodenum.

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