Mark the correct option that shows highest to lowest % resorption of substances from nephron: 

(a) Water > Sodium > Urea 

(b) Glucose > Water > Urea 

(c) Water > Urea > Glucose 

(d) Urea > Glucose > Sodium

Which of the diagrams given below will best represent stabilising selection In a population with continuous variations? X axis represents phenotype with quantitative variation while Y axis represents frequency of individuals,

The photosynthetic pigment that provides effective photoprotection is : 

(a) chlorophyll b 

(b) chlorophyll e 

(c) phycobilins 

(d) carotenoids

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

Despite the lack of pressure, blood moves towards the heart in veins due to the 

(a) wider bore. 

(b) suction created due to pumping by heart. 

(c) narrow bores of efferent capillaries. 

(d) presence of valves preventing back flow.

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

If a tissue is consuming 50 molecules of O₂ and releasing 70 molecules of CO₂, then the substrate being utilized in cellular respiration is : 

(a) glucose 

(b) fatty acid 

(c) amino acid 

(d) organic acid

In principle,longest Henle’s loop should be found in the nephrons of desert dwelling mammal feeding mainly on : 

(a) succulent cactus 

(b) fleshy fruits 

(c) leathery leaves 

(d) seeds

Three types of mutations are listed below: 

I. Chromosomal mutation 

II. Gene mutation 

iii. Somatic mutation Which of the following statements describe them correctly? 

(a) i & ii both describe the same phenomenon 

(b) iii will always result in abnormal cell growth leading to cancer. 

(c) Only gene mutation can alter the DNA sequence. 

(d) Gene duplication is a type of chromosomal mutation.

The sugar glider and flying squirrel belong to two different groups of mammals, but they have both evolved bushy tails and flaps of skin that help them exploit their forest environments more efficiently. This pattern of evolution is an example of: 

(a) character displacement 

(b) adaptive radiation. 

(c) convergent evolution 

(d) divergent evolution