Correct Answer: (b)
Cycle starts with Oxaloacetic acid, not pyruvic acid directly.
Q2. Which of the following in sewage treatment removes suspended solids ?
Correct Answer: (a)
Primary treatment is physical removal.
Q3. What is the criterion for DNA fragments movement on agarose gel during gel electrophoresis ?
Correct Answer: (d)
Smaller fragments move faster through pores.
Q4. Which among the following are the smallest living cells, known without a definite cell wall, pathogenic to plants as well as animals and can survive without oxygen ?
Correct Answer: (a)
Mycoplasma lack a cell wall.
Q5. Receptor sites for neurotransmitters are present on :
Correct Answer: (b)
Receptors are located on the post-synaptic membrane to receive chemical signals.
Q6. Frog's heart when taken out of the body continues to beat for sometime. Select the best option from the following statements. (a) Frog is a poikilotherm. (b) Frog does not have any coronary circulation. (c) Heart is "myogenic" in nature. (d) Heart is autoexcitable.
Correct Answer: (b)
Heart is myogenic and autoexcitable.
Correct Answer: (b)
Double fertilization is unique to Angiosperms.
Q16. Good vision depends on adequate intake of carotene-rich food. Select the best option from the following statements. (a) Vitamin A derivatives are formed from carotene. (b) The photopigments are embedded in the membrane discs of the inner segment. (c) Retinal is a derivative of Vitamin A. (d) Retinal is a light absorbing part of all the visual photopigments.
Correct Answer: (d)
Statements (a), (c), and (d) are correct. (b) is wrong as photopigments are in the outer segment.
Q17. Homozygous purelines in cattle can be obtained by :
Q18. Flowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by :
Correct Answer: (a)
Typical for wind-pollinated flowers.
Q19. Adult human RBCs are enucleate. Which of the following statement(s) is/ are most appropriate explanation for this feature ? (a) They do not need to reproduce (b) They are somatic cells (c) They do not metabolize (d) All their internal space is available for oxygen transport
Correct Answer: (c)
Lack of nucleus maximizes space for Hemoglobin/Oxygen.
Q20. Which of the following RNAs should be most abundant in animal cell ?
Correct Answer: (c)
r-RNA is ~80%.
Q21. GnRH, a hypothalamic hormone, needed in reproduction, acts on :
Correct Answer: (d)
GnRH stimulates the anterior pituitary to release LH and FSH.
Q22. A baby boy aged two years is admitted to play school and passes through a dental check - up. The dentist observed that the boy had twenty teeth. Which teeth were absent ?
Q23. Transplantation of tissues/organs fails often due to non-acceptance by the patient's body. Which type of immune-response is responsible for such rejections ?
Correct Answer: (d)
Cell-mediated immunity is responsible for graft rejection.
Q24. A disease caused by an autosomal primary non-disjunction is
Correct Answer: (c)
Down's syndrome is caused by the non-disjunction of the 21st chromosome (Autosomal).
Q25. The DNA fragments separated on an agarose gel can be visualised after staining with
Correct Answer: (b)
EtBr is used to stain DNA.
Q26. Among the following characters, which one was not considered by Mendel in his experiments on pea ?
Correct Answer: (d)
Mendel did not study Trichomes. He studied 7 other specific traits.
Q27. Which ecosystem has the maximum biomass ?
Correct Answer: (c)
Forests have the highest accumulated biomass.
Q28. The pivot joint between atlas and axis is a type of :
Correct Answer: (a)
The pivot joint is a type of synovial joint.
Q29. DNA replication in bacteria occurs
Correct Answer: (a)
Bacteria replicate DNA just before binary fission.
Q30. Which of the following facilitates opening of stomatal aperture ?
Correct Answer: (a)
Radial orientation of microfibrils allows the stoma to open when guard cells are turgid.
Q31. Which one of the following statements is not valid for aerosols ?
Correct Answer: (a)
Aerosols are pollutants and generally decrease agricultural productivity.
Q32. Functional megaspore in an angiosperm develops into .
Correct Answer: (a)
Megaspore becomes the female gametophyte.
Q33. Which of the following statements is correct ?
Correct Answer: (c)
Ascending limb is water-impermeable.
Q34. A temporary endocrine gland in the human body is :
Correct Answer: (a)
Corpus luteum is a temporary endocrine structure.
Q35. Which one from those given below is the period for Mendel's hybridization experiments ?
Correct Answer: (c)
Mendel conducted experiments from 1856-1863.
Q37. Out of 'X' pairs of ribs in humans only 'Y' pairs are true ribs. Select the option that correctly represents values of X and Y and provides their explanation :
Correct Answer: (c)
Human has 12 pairs of ribs; first 7 pairs are true ribs.
Q38. Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statement.
Correct Answer: (a)
Thalassemia is quantitative; Sickle cell is qualitative.
Q39. The hepatic portal vein drains blood to liver from :
Correct Answer: (b)
Drains from Intestine.
Q40. Lungs are made up of air-filled sacs, the alveoli. They do not collapse even after forceful expiration, because of :
Q42. The morphological nature of the edible part of coconut is :
Correct Answer: (a)
The edible part is the endosperm.
Q43. Which of the following cell organelles is responsible for extracting energy from carbohydrates to form ATP ?
Correct Answer: (b)
Mitochondria are the sites of aerobic respiration where ATP is produced.
Q44. Fruit and leaf drop at early stages can be prevented by the application of :
Correct Answer: (a)
Auxins inhibit early abscission.
Q45. In Bougainvillea thorns are the modifications of :
Correct Answer: (a)
Thorns in Bougainvillea are stem modifications.
Q46. A dioecious flowering plant prevents both
Correct Answer: (d)
Dioecious plants have male and female flowers on different plants, preventing both autogamy and geitonogamy.
Q47. Myelin sheath is produced by :
Correct Answer: (c)
Schwann (PNS) and Oligodendrocytes (CNS) produce myelin.
Q48. The genotypes of a Husband and Wife are IAIB and IAi. Among the blood types of their children, how many different genotypes and phenotypes are possible ?
Correct Answer: (a)
Possible: IAIA, IAi, IAIB, IBi (4G, 3P).
Q49. Viroids differ from viruses in having .
Correct Answer: (b)
Viroids are naked RNA molecules.
Q50. Capacitation occurs in :
Correct Answer: (b)
Occurs in the female tract.
Q51. Presence of plants arranged into well defined vertical layers depending on their height can be seen best in :
Correct Answer: (d)
Vertical stratification is most prominent in Rain Forests.
Q52. Coconut fruit is a .
Correct Answer: (c)
Coconut is a drupe.
Q53. With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct ?
Correct Answer: (a)
C4 plants have a higher temperature optimum.
Q54. The water potential of pure water is :
Correct Answer: (c)
Pure water has a potential of Zero by convention.
Q55. Root hairs develop from the region of :
Correct Answer: (c)
Root hairs arise from the maturation zone.
Q62. Which of the following are found in extreme saline conditions ?
Correct Answer: (c)
Halophiles are Archaebacteria.
Q63. The association of histone H1 with a nucleosome indicates :
Correct Answer: (a)
H1 histone helps stabilize the 30nm chromatin fiber structure.
Q64. The process of separation and purification of expressed protein before marketing is called
Correct Answer: (d)
Downstream processing covers purification and recovery.
Q65. If there are 999 bases in an RNA that codes for a protein with 333 amino acids, and the base at position 901 is deleted such that the length of the RNA becomes 998 bases, how many codons will be altered ?
Correct Answer: (a)
(999-900)/3 = 33 codons are shifted.
Q66. Asymptote in a logistic growth curve is obtained when :
Correct Answer: (d)
Growth flattens out (asymptote) when population size (N) equals carrying capacity (K).
Q67. In case of poriferans, the spongocoel is lined with flagellated cells called
Correct Answer: (a)
Choanocytes line the spongocoel.
Q68. Match the following sexually transmitted diseases (Column - I) with their causative agent (Column - II) and select the correct option.
Q79. An important characteristic that Hemichordates share with Chordates is
Correct Answer: (a)
Both possess pharyngeal gill slits.
Q80. An example of colonial alga is
Correct Answer: (d)
Volvox is colonial.
Q81. Anaphase Promoting Complex (APC) is a protein degradation machinery necessary for proper mitosis of animal cells. If APC is defective in a human cell, which of the following is expected to occur ?