Q1. Which of the following most appropriately describes haemophilia ?
Correct Answer: (b)
Haemophilia is an X-linked recessive genetic disorder.
Q2. 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.
Q3. Which of the following statements is wrong for viroids ?
Correct Answer: (d)
Viroids have RNA of low molecular weight.
Q4. Which of the following is not a feature of the plasmids ?
Correct Answer: (d)
Plasmids are double-stranded DNA molecules.
Q5. The Avena curvature is used for bioassay of :
Correct Answer: (c)
Avena curvature test is the bioassay for Auxin (IAA).
Q6. Fertilization in humans is practically feasible only if :
Correct Answer: (b)
Transport must be simultaneous to the ampullary-isthmic junction.
Q7. The standard petal of a papilionaceous corolla is also called :
Correct Answer: (c)
The largest posterior petal is the Vexillum (Standard).
Q8. Microtubules are the constituents of :
Correct Answer: (b)
Microtubules make up the cytoskeleton of spindle fibers, cilia, and centrioles.
Q9. Which of the following features is not present in Periplaneta americana ?
Correct Answer: (b)
Insects have determinate and spiral cleavage.
Q10. Joint Forest Management Concept was introduced in India during :
Correct Answer: (c)
JFM was introduced by the Govt. of India in the 1980s.
Q11. 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).
Q12. 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.
Q13. In a chloroplast the highest number of protons are found in :
Correct Answer: (b)
Protons accumulate in the lumen of thylakoids during light reaction.
Q14. Which part of the tobacco plant is infected by Meloidogyne incognita ?
Correct Answer: (d)
This nematode infects the roots of tobacco plants.
Q15. Which one of the following is a characteristic feature of cropland ecosystem ?
Correct Answer: (b)
Artificial ecosystems like croplands have low genetic diversity.
Q16. 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.
Q17. Spindle fibres attach on to :
Correct Answer: (b)
Spindle fibres attach to the kinetochore protein discs.
Q18. 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.
Q19. 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.
Q20. 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.
Q21. 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.
Q22. 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.
Q23. 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.
Q24. In context of Amniocentesis, which of the following statement is incorrect ?
Q26. 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.
Q27. 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.
Q28. One of the major components of cell wall of most fungi is :
Correct Answer: (a)
Fungal cell walls are made of chitin.
Q29. The coconut water from tender coconut represents :
Correct Answer: (d)
Tender coconut water is free-nuclear endosperm.
Q30. 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.
Q31. The taq polymerase enzyme is obtained from :
Correct Answer: (a)
Taq polymerase is isolated from the thermophilic bacterium Thermus aquaticus.
Q32. Tricarpellary, syncarpous gynoecium is found in flowers of :
Correct Answer: (a)
Liliaceae typically has a tricarpellary syncarpous ovary.
Q33. 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.
Q34. Identify the correct statement on 'inhibin' :
Correct Answer: (b)
Inhibin is produced by granulose cells (females) or Sertoli cells (males) and inhibits FSH.
Q35. 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.
Q36. Changes in GnRH pulse frequency in females is controlled by circulating levels of :
Correct Answer: (a)
Ovarian steroids provide feedback to the hypothalamus.
Q37. Blood pressure in the pulmonary artery is :
Correct Answer: (c)
Arterial pressure is always higher than venous pressure in the same circuit.
Q38. 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).
Q39. Which of the following features is not present in the Phylum - Arthropoda ?
Correct Answer: (c)
Parapodia are found in Annelida, not Arthropoda.
Q40. Asthma may be attributed to :
Correct Answer: (b)
Asthma is an allergic response causing bronchospasm.
Q41. Which is the National Aquatic Animal of India ?
Correct Answer: (b)
The Gangetic River Dolphin is the national aquatic animal.
Q42. Which one of the following statements is not true ?
Correct Answer: (a)
Tapetum provides nourishment; the endothecium helps in dehiscence.
Q43. 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.
Q44. 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.
Q45. Photosensitive compound in human eye is made up of :
Correct Answer: (b)
Rhodopsin consists of Opsin and Retinal.
Q46. 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).
Q47. Select the incorrect statement :
Correct Answer: (c)
Gonadotropins (LH/FSH) increase, not decrease, during the follicular phase.
Q48. 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.
Q49. Analogous structures are a result of :
Correct Answer: (b)
Analogous organs arise from convergent evolution due to similar environments.
Q50. A typical fat molecule is made up of :
Correct Answer: (b)
A triglyceride consists of one glycerol backbone esterified to three fatty acids.
Q51. Name the chronic respiratory disorder caused mainly by cigarette smoking :
Correct Answer: (a)
Emphysema is a chronic disorder caused by cigarette smoking.
Q52. In meiosis crossing over is initiated at :
Correct Answer: (a)
Crossing over occurs during the Pachytene stage of Prophase I.
Q53. Which one of the following statements is wrong ?
Correct Answer: (c)
Eubacteria are 'true' bacteria, not false bacteria.
Continue in App
For the best quiz experience and detailed performance analytics, download the Master Biology App.