- DDT residues are rapidly passed through food chain causing
biomagnification because DDT is
(a) water soluble (b) lipid soluble
(c) moderately toxic (d) non-toxic to aquatic animals. - A mule is produced by the interspecific hybridisation between
(a) Hisardale and Merino rams
(b) male donkey and female horse
(c) female donkey and male horse
(d) Merino rams and female horse. - Which of the following technique is employed in the test-tube
baby programme?
(a) Intra Cytoplasmic Sperm Injection (ICSI)
(b) Intra Uterine Insemination (IUI)
(c) Gamete Intra Fallopian Transfer (GIFT)
(d) Zygote Intra Fallopian Transfer (ZIFT) - The table summarises the differences between habitat and niche.
Habitat Niche
(i) It supports a single species.It supports a number of species.
(ii) It has number of
environmental variables.
It has specific set of
environmental regimes.
(iii)A species does not
change its habitat.A species may live in more than
one niche.
Which of the above given differences are correct?
(a) (i) only (b) (ii) and (iii) only
(c) (iii) only (d) (i) and (iii) only- Identify A, B and C the given diagram showing microsporangium of a
mature anther.
A
B
C(a) A-Middle layer, B-Endothecium, C-Tapetum
(b) A-Endothecium, B-Tapetum, C-Middle layer
(c) A-Endothecium, B-Middle layer, C-Tapetum
(d) A-Tapetum, B-Middle layer, C-Endothecium- Which of the following is a correct match of ear part and its function?
(a) Organ of Corti – Increases the efficiency of sound waves
(b) Eustachian tube – Maintains body balance and posture
(c) Tectorial membrane – Determines patterns of vibration of
sound waves
(d) Semicircular canal – Equalises the air pressure on either
sides of the ear drum - Refer the given reaction.
2H 2 O → 4H+ + O 2 + 4e–
Where does this reaction take place in the chloroplasts of plants?
(a) Outer surface of thylakoid membrane
(b) Inner surface of thylakoid membrane
(c) In the matrix (stroma) (d) Intermembrane space
- Columns of Bertin in the kidneys of mammals are formed as extensions of
(a) cortex in medulla (b) cortex in pelvis
(c) medulla in pelvis (d) pelvis in ureter. - Refer the given diagrammatic representation of the mechanism of
action of a protein hormone.
Ovarian cell
membraneReceptorHormoneABC
In which of the following options correct labelling of A, B and C is given?
A B C
(a) Generation of Physiological Biochemical
second messenger responses responses
(b) Activation Biochemical Generation of
of genes responses second messenger
(c) Generation of Biochemical Physiological
second messenger responses responses
(d) Biochemical Activation Physiological
responses of genes responses- Colchicine is a cell poison which arrests cell division at __ and
can induce ___.
(a) metaphase, parthenocarpy
(b) anaphase, parthenocarpy
(c) metaphase, polyploidy (d) anaphase, polyploidy - Which of the following statements is incorrect for centrioles?
(a) Both the centrioles in a centrosome lie perpendicular to each other.
(b) Central proteinaceous hub is missing in a centriole.
(c) Each centriole has an organisation like that of a cartwheel.
(d) Centrioles are absent in angiosperms, higher gymnosperms,
some algae and fungi. - In glycolysis, substrate level phosphorylation occurs during conversion of
(a) 3-phosphoglycerate to 2-phosphoglycerate
(b) phosphoenol pyruvate to pyruvate
(c) glyceraldehyde 3-phosphate to 1, 3-biphosphoglycerate
(d) fructose-6-phosphate to fructose-1, 6-biphosphate. - Which of the following helps in absorption of phosphorus from soil
by plants?
(a) Glomus (b) Rhizobium
(c) Frankia (d) Anabaena - Read the given statements and select the option that correctly
identifies the incorrect ones.
(i) Cytokinins are primarily concerned with cell division.
(ii) C 2 H 4 breaks seed and bud dormancy.
(iii) ABA stimulates the opening of stomata.
(iv) C 2 H 4 initiates germination in peanut seeds, sprouting of potato
tubers.
(v) ABA is synergistic to GA.
(a) (i), (ii) and (iv) (b) (iii) and (ii)
(c) (iii) and (v) (d) (iv) and (v) - Which of the following is not a viral disease of plants?
(a) Red rot of sugarcane (b) Tobacco mosaic disease
(c) Leaf curl of tomato (d) Tristeza disease of citrus - The floral formula KC(5) (5)AG 5 (2) belongs to the Family
(a) Fabaceae (b) Asteraceae
(c) Solanaceae (d) Liliaceae.