6868 MTMTBIOLOGY TODAYBIOLOGY TODAY || MARCH ‘16MARCH ‘16
(b) preventing the process of translation of mRNA
(c) preventing the process of splicing of hnRNA
(d) preventing the process of transcription.
- Which of the following statements is correct?
(a) Sporopollenin can be degraded by enzymes.
(b) Sporopollenin is made up of inorganic materials.
(c) Sporopollenin can withstand high temperatures as
well as strong acids and alkalis.
(d) Sporopollenin can withstand high temperatures but
not strong acids.
- Starting from the maximum, arrange the following male
reproductive accessory organs in the correct order, based
on the amount of secretion.
(i) Prostrate gland
(ii) Seminal vesicle
(iii) Bulbourethral gland
(a) (i) > (ii) > (iii) (b) (iii) > (ii) > (i)
(c) (ii) > (iii) > (i) (d) (ii) > (i) > (iii)
- Read the following statements and choose the correct
option.
A. Increase in melanised moths after industrialisation in
Great Britain is a proof for natural selection.
B. When more individuals of a population acquire a
mean character value, it is called disruption.
C. Changes in allelic frequency in a population will lead
to Hardy-Weinberg equilibrium.
D. Genetic drift changes the existing gene or allelic
frequency in future generations.
(a) B alone is correct.
(b) D alone is correct.
(c) A and D alone are correct.
(d) A and C alone are correct.
- Photochemical smog formed in congested metropolitan
cities mainly consists of
(a) ozone, peroxyacyl nitrate and NOx
(b) smoke, peroxyacyl nitrate and SO 2
(c) hydrocarbons, SO 2 and CO 2
(d) hydrocarbons, ozone and SOx.
- Which of the following statements about productivity is
true?
(a) The annual net primary productivity of the whole of
the biosphere is 17 billion tons (dry weight) of organic
matter.
(b) Net primary productivity is the amount of biomass
available for consumption by carnivores.
(c) Secondary productivity is defined as the rate of
formation of new organic matter by decomposers.
(d) Primary productivity depends on the plant species
inhabiting a particular area.
72. The three boxes in this diagram represent the three major
biosynthetic pathways in aerobic respiration. Arrows
represent net reactants or products.
Pathw ay A 2 Pathw ay B^6 Pathw ay C^11
Glucose
1 5
10
9
12
7
4 3 8
Arrows numbered 4, 8 and 12 can all be
(a) H 2 O (b) FAD+ or FADH 2
(c) NADH (d) ATP.
- Match the entries in Column - I with those of Column - II
and choose the correct answer given below.
Column - I Column - II
(A) Cytokinins (p) Stress hormone
(B) Auxins (q) Ripening of fruits
(C) Abscisic acid (r) Apical dominance
(D) Ethylene (s) Bolting
(t) Richmond Lang effect
(a) A - (t), B - (r), C - (p), D - (q)
(b) A - (t), B - (r), C - (p), D - (s)
(c) A - (r), B - (s), C - (q), D - (p)
(d) A - (q), B - (q), C - (t), D - (r)
- The two reducing powers of light reaction are used in dark
reaction during formation of
(a) 3-phosphoglycerate from ribulose-1, 5-bisphosphate
(b) glyceraldehyde 3-phosphate from 3-phospho-glycerate
(c) sucrose from triose phosphate
(d) ribulose-1, 5-bisphosphate from triose phosphate.
- Read the following statements and select the correct
option.
A. Circulatory system in arthropods is of closed type.
B. Parapodia in annelids help in swimming.
C. Phylum Mollusca is the second largest animal
phylum.
D. Aschelminthes are dioecious.
(a) A and C alone are wrong
(b) A alone is wrong
(c) C alone is wrong
(d) C and D alone are wrong
- Global warming can be controlled by
(a) increasing deforestation, slowing down the growth of
human population.
(b) increasing deforestation, reducing efficiency of energy
usage.
(c) reducing deforestation, cutting down use of fossil
fuel.
(d) reducing reforestation, increasing the use of fossil
fuel.
