Observe the given diagram and select the possible reason for the movement of water through the Semipermeable membrane (SM) separating sides A and B:

(a) Addition of solute reduces the water potential in side A hence water moves from A to B: 

(b) Withdrawal of piston in side, B increases water potential hence water move from A to B. 

(c) Due to atmospheric pressure in side A, water potential becomes 0 and hence water moves from A to B. 

(d) Withdrawal of piston in side B decreases the water potential and hence water moves from A to B.

The diagram below shows the concentration of hormones in circulating blood as percentage of their maximum possible concentration. Which phase of ovarian cycle of a mammal does it represent?

In a population of a species with 500 gene loci, half the loci are fixed.In the remaining, there are two alleles at each locus. How many alleles are therein the gene pool? 

(a) 500 

(b) 750 

(c) 250 

(d) 550

The photosynthetic pigment that provides effective photoprotection is : 

(a) chlorophyll b 

(b) chlorophyll e 

(c) phycobilins 

(d) carotenoids

If a quantitative character is influenced by an additive effect of four genes, how many phenotypic categories are expected in the progeny of a tetrahybrid cross? 

(a) 5 

(b) 7 

(c) 9 

(d) 11

Though both starch and cellulose are composed of repeating glucose units, the main difference between them is that: 

(a) they are bonded by 1-6 and 1-4 glycosidic linkages respectively. 

(b) they differ in the α and  β configuration. 

(c) most of the fruits and grains are rich in starch and poor in cellulose or fiber. 

(d) starch is made of simple sugars while cellulose is made of amino sugars.

A biochemist prepared a mixture of all reactants and enzymes he thought were needed for DNA replication. When DNA was added, replication occurred. The product, however, consisted of the parent DNA strand paired with several DNA segments, each segment, a few hundred nucleotides long. Which of the following could possibly be missing in the reaction mixture?

(a) DNA polymerase. 

(b) RNA primers. 

(c) DNA ligase. 

(d) Single strand binding proteins

The number of classes of phenotypes in the F₂ generation of a cross between dihybrids involving both the genes with incomplete dominance would be: 

(a) six 

(b) nine 

(c) sixteen 

(d) eight

 If blood of healthy human is tested after high protein meal, which of the following will not be observed? 

(a) Considerable increase in plasma glucose level. 

(b) Raised insulin level. 

(c) High plasma glucagon level. 

(d) Increased amino acids level.

Correct arrangement of the following in increasing size is : 

i. Width of biological membrane. 

ii. Diameter of E. coli DNA. 

iii. Human ribosome. 

iv. Length of E. coli DNA. 

v. Diameter of human liver cell. 

(a) i, iii, ii, iv, v 

(b) ii, i, iii, v, iv 

(c) i, iii, v, ii, iv 

(d) ii, iii, i, iv, v