Match the diseases given in Column I with the principal causal organisms in Column II and choose the correct combination.

(a) P-iv, Q-iii, R-i, S-ii

(b) P-iv, Q-ii, R-i, S-iii

(c) P-i, Q-ii, R-iv, S-iii

(d) P-i, Q-iv, R-ii, S-iii

If  ¹⁴CO₂ is added to a suspension of photosynthesizing chloroplasts, which of the following will be the first compound to be radioactive ?

(A)  ATP

(B)  NADPH

(C)  NADH

(D)  3-phosphoglycerate  

Which one of the following drug is not obtained from fungal or plant sources?

(a) Penicillin

(b) Reserpine

(c) Acetaminophen

(d) Quinine

Which one of the following is a modified leaf?

(a) Sweet potato

(b) Ginger

(c) Onion

(d) Carrot

Enzyme X extracted from the digestive system hydrolyses peptide bonds. Which of the following is probable candidate to be enzyme X?

(a) Amylase

(b) Lipase

(c) Trypsin

(d) Maltase

Which one of the following statements about mitosis is correct?

(a) One nucleus gives rise to 4 nuclei

(b) Homologous chromosomes synapse during anaphase

(c) The centromeres separate at the onset of anaphase

(d) Non-sister chromatids recombine

 Let a, b be non-zero real numbers. Which of the following statements about the quadratic equation ax² + (a + b)x + b = 0 is neccesarily true ?

(I) It has at least one negative root 

(II) It has at least one positive root. 

(III) Both its roots are real. 

(A) (I) and (II) only (B) (I) and (III) only (C) (II) and (III) only (D) All of them

What is the advantage of storing glucose as glycogen in animals instead of a monomeric glucose?

(a) Energy obtained from glycogen is more than that from the corresponding glucose monomers

(b) Glucose present as monomers within the cell exerts more osmotic pressure than a single glycogen molecule, resulting in loss of water from the cells

(c) Glucose present as monomers within the cell exerts more osmotic pressure than a single glycogen molecule, resulting in excess water within the cells

(d) Glycogen gives more rigidity to the cells

CO₂ acts as a greenhouse gas because

(A)  it is transparent to heat but traps sunlight.

(B)  it is transparent to sunlight but traps heat.

(C)  it is transparent to both sunlight and heat.

(D)  it traps both sunlight and heat. 

Which one of the following enzymes shows the greatest substrate specificity? 

(a) Lipase 

(b) Nuclease 

(c) Pepsin 

(d) Sucrose