Q1. 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.
Q2. Asymptote in a logistic growth curve is obtained when :
Correct Answer: (d)
Growth flattens out (asymptote) when population size (N) equals carrying capacity (K).
Q3. 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.
Q4. During DNA replication, Okazaki fragments are used to elongate :
Correct Answer: (b)
Okazaki fragments are formed on the lagging strand.
Q5. Which of the following is correctly matched for the product produced by them ?
Correct Answer: (b)
Yeast produces ethanol via fermentation.
Q6. 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).
Q7. Which ecosystem has the maximum biomass ?
Correct Answer: (c)
Forests have the highest accumulated biomass.
Q8. 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.
Q9. The hepatic portal vein drains blood to liver from :
Correct Answer: (b)
Drains from Intestine.
Q10. The region of Biosphere Reserve which is legally protected and where no human activity is allowed is known as :
Correct Answer: (c)
Core zone is legally protected.
Q11. DNA replication in bacteria occurs
Correct Answer: (a)
Bacteria replicate DNA just before binary fission.
Q12. 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 ?
Q13. Receptor sites for neurotransmitters are present on :
Correct Answer: (b)
Receptors are located on the post-synaptic membrane to receive chemical signals.
Q14. 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 ?
Q15. A temporary endocrine gland in the human body is :
Correct Answer: (a)
Corpus luteum is a temporary endocrine structure.
Q16. In Bougainvillea thorns are the modifications of :
Correct Answer: (a)
Thorns in Bougainvillea are stem modifications.
Q17. 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.
Q18. 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).
Q19. Which one from those given below is the period for Mendel's hybridization experiments ?
Correct Answer: (c)
Mendel conducted experiments from 1856-1863.
Q20. Which of the following options gives the correct sequence of events during mitosis ?
Q21. Which among these is the correct combination of aquatic mammals ?
Correct Answer: (a)
Whales, dolphins, and seals are mammals.
Q22. Which statement is wrong for Krebs' cycle ?
Correct Answer: (b)
Cycle starts with Oxaloacetic acid, not pyruvic acid directly.
Q23. The DNA fragments separated on an agarose gel can be visualised after staining with
Correct Answer: (b)
EtBr is used to stain DNA.
Q24. Coconut fruit is a .
Correct Answer: (c)
Coconut is a drupe.
Q25. 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.
Q26. The process of separation and purification of expressed protein before marketing is called
Correct Answer: (d)
Downstream processing covers purification and recovery.
Q27. An example of colonial alga is
Correct Answer: (d)
Volvox is colonial.
Q28. GnRH, a hypothalamic hormone, needed in reproduction, acts on :
Correct Answer: (d)
GnRH stimulates the anterior pituitary to release LH and FSH.
Q29. The final proof for DNA as the genetic material came from the experiments of :
Q39. An important characteristic that Hemichordates share with Chordates is
Correct Answer: (a)
Both possess pharyngeal gill slits.
Q40. 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.
Q41. Capacitation occurs in :
Correct Answer: (b)
Occurs in the female tract.
Q42. Alexander Von Humboldt described for the first time :
Correct Answer: (a)
Humboldt described that species richness increases with area explored, up to a limit.
Q43. Which of the following statements is correct ?
Correct Answer: (c)
Ascending limb is water-impermeable.
Q44. Which of the following are not polymeric ?
Correct Answer: (b)
Lipids are not polymers.
Q45. The morphological nature of the edible part of coconut is :
Correct Answer: (a)
The edible part is the endosperm.
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. 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.
Q48. Plants which produce characteristic pneumatophores and show vivipary belong to :
Correct Answer: (d)
Mangroves (Halophytes) show these traits.
Q49. Which of the following are found in extreme saline conditions ?
Correct Answer: (c)
Halophiles are Archaebacteria.
Q50. In case of poriferans, the spongocoel is lined with flagellated cells called
Correct Answer: (a)
Choanocytes line the spongocoel.
Q51. Double fertilization is exhibited by :
Correct Answer: (b)
Double fertilization is unique to Angiosperms.
Q52. A dioecious flowering plant prevents both
Correct Answer: (d)
Dioecious plants have male and female flowers on different plants, preventing both autogamy and geitonogamy.
Q53. Hypersecretion of Growth Hormone in adults does not cause further increase in height, because :
Correct Answer: (d)
Height increase stops once the epiphyseal plates fuse.
Q54. Mycorrhizae are the example of :
Correct Answer: (b)
Mutualism between fungus and roots.
Q55. MALT constitutes about ____ percent of the lymphoid tissue in human body.
Correct Answer: (c)
MALT is 50% of lymphoid tissue.
Q73. 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.
Q74. The vascular cambium normally gives rise to :
Correct Answer: (a)
Produces secondary xylem.
Q75. Which one of the following statements is not valid for aerosols ?
Correct Answer: (a)
Aerosols are pollutants and generally decrease agricultural productivity.
Correct Answer: (c)
Root hairs arise from the maturation zone.
Q81. 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.
Q82. The pivot joint between atlas and axis is a type of :
Correct Answer: (a)
The pivot joint is a type of synovial joint.
Q83. Which of the following RNAs should be most abundant in animal cell ?
Correct Answer: (c)
r-RNA is ~80%.
Q84. 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.
Q85. Which of the following is made up of dead cells ?
Correct Answer: (a)
Cork (Phellem) is composed of dead cells.
Q86. Identify the wrong statement in context of heartwood :