Q1. The function of copper ions in copper releasing IUD's is :
Correct Answer: (c)
Copper ions are spermicidal.
Q2. Life cycle of Ectocarpus and Fucus respectively are :
Correct Answer: (a)
Ectocarpus is haplodiplontic; Fucus is diplontic.
Q3. A dioecious flowering plant prevents both
Correct Answer: (d)
Dioecious plants have male and female flowers on different plants, preventing both autogamy and geitonogamy.
Q4. A gene whose expression helps to identify transformed cell is known as
Correct Answer: (c)
Selectable markers help identify transformants.
Q5. 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.
Q6. Which one of the following statements is not valid for aerosols ?
Correct Answer: (a)
Aerosols are pollutants and generally decrease agricultural productivity.
Q7. The vascular cambium normally gives rise to :
Correct Answer: (a)
Produces secondary xylem.
Q8. MALT constitutes about ____ percent of the lymphoid tissue in human body.
Correct Answer: (c)
MALT is 50% of lymphoid tissue.
Correct Answer: (b)
In Chlamydomonas, the zygote is the only diploid stage and undergoes meiosis.
Q25. 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.
Q26. 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.
Q27. Mycorrhizae are the example of :
Correct Answer: (b)
Mutualism between fungus and roots.
Q28. Fruit and leaf drop at early stages can be prevented by the application of :
Correct Answer: (a)
Auxins inhibit early abscission.
Q29. Myelin sheath is produced by :
Correct Answer: (c)
Schwann (PNS) and Oligodendrocytes (CNS) produce myelin.
Q30. In case of a couple where the male is having a very low sperm count, which technique will be suitable for fertilisation ?
Correct Answer: (a)
Artificial Insemination used for low count.
Q31. Which ecosystem has the maximum biomass ?
Correct Answer: (c)
Forests have the highest accumulated biomass.
Q32. 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.
Q33. What is the criterion for DNA fragments movement on agarose gel during gel electrophoresis ?
Correct Answer: (d)
Smaller fragments move faster through pores.
Q34. 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).
Q35. The association of histone H1 with a nucleosome indicates :
Correct Answer: (a)
H1 histone helps stabilize the 30nm chromatin fiber structure.
Q36. In case of poriferans, the spongocoel is lined with flagellated cells called
Correct Answer: (a)
Choanocytes line the spongocoel.
Q37. An example of colonial alga is
Correct Answer: (d)
Volvox is colonial.
Q38. Select the correct route for the passage of sperms in male frogs :
Correct Answer: (b)
Frog sperm path includes Bidder's canal and kidney.
Q39. Alexander Von Humboldt described for the first time :
Correct Answer: (a)
Humboldt described that species richness increases with area explored, up to a limit.
Q40. Which of the following in sewage treatment removes suspended solids ?
Correct Answer: (a)
Primary treatment is physical removal.
Q41. Which of the following statements is correct ?
Correct Answer: (c)
Ascending limb is water-impermeable.
Q42. Select the mismatch
Correct Answer: (d)
Rhodospirillum is a free-living nitrogen-fixing bacterium, not mycorrhiza.
Q43. The pivot joint between atlas and axis is a type of :
Correct Answer: (a)
The pivot joint is a type of synovial joint.
Q44. Which of the following represents order of 'Horse' ?
Correct Answer: (d)
Order is Perissodactyla.
Q45. Which of the following is made up of dead cells ?
Correct Answer: (a)
Cork (Phellem) is composed of dead cells.
Q46. 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.
Q47. Which among these is the correct combination of aquatic mammals ?
Correct Answer: (a)
Whales, dolphins, and seals are mammals.
Q48. 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 ?
Q49. The DNA fragments separated on an agarose gel can be visualised after staining with
Correct Answer: (b)
EtBr is used to stain DNA.
Q50. 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.
Q51. Functional megaspore in an angiosperm develops into .
Correct Answer: (a)
Megaspore becomes the female gametophyte.
Q52. 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.
Q53. DNA fragments are :
Correct Answer: (d)
DNA is negatively charged.
Q54. 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.
Q55. Which one of the following is related to Ex-situ conservation of threatened animals and plants ?
Correct Answer: (c)
Wildlife Safari parks are Ex-situ conservation methods.
Q56. 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.
Q57. Match the following sexually transmitted diseases (Column - I) with their causative agent (Column - II) and select the correct option.
Q60. Which of the following options best represents the enzyme composition of pancreatic juice ?
Correct Answer: (b)
Pancreatic juice contains amylase, lipase, and trypsinogen.
Q61. The hepatic portal vein drains blood to liver from :
Correct Answer: (b)
Drains from Intestine.
Q62. 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.
Q63. 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).
Q64. Which of the following are found in extreme saline conditions ?
Correct Answer: (c)
Halophiles are Archaebacteria.
Q65. 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.
Q66. Coconut fruit is a .
Correct Answer: (c)
Coconut is a drupe.
Q67. Select the mismatch :
Correct Answer: (c)
Pinus is monoecious (male and female cones on the same plant).
Q68. Plants which produce characteristic pneumatophores and show vivipary belong to :
Correct Answer: (d)
Mangroves (Halophytes) show these traits.
Q69. Asymptote in a logistic growth curve is obtained when :
Correct Answer: (d)
Growth flattens out (asymptote) when population size (N) equals carrying capacity (K).
Q70. Identify the wrong statement in context of heartwood :
Correct Answer: (a)
Heartwood is non-conducting.
Q71. Which of the following RNAs should be most abundant in animal cell ?
Correct Answer: (c)
r-RNA is ~80%.
Q72. Receptor sites for neurotransmitters are present on :
Correct Answer: (b)
Receptors are located on the post-synaptic membrane to receive chemical signals.
Q73. Phosphoenol pyruvate (PEP) is the primary CO2 acceptor in .
Correct Answer: (d)
In C4 plants, PEP is the first acceptor of CO2.
Q74. Root hairs develop from the region of :
Correct Answer: (c)
Root hairs arise from the maturation zone.
Q75. A temporary endocrine gland in the human body is :
Correct Answer: (a)
Corpus luteum is a temporary endocrine structure.
Q76. The final proof for DNA as the genetic material came from the experiments of :
Q87. 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 ?