Spectrum biology

65 .Ischihara chart is used to detect
(a) tuberculosis (b) eye sight
(c) colour blindness (d) diabetes

66 .Given be low is a sim pli fied model of phos pho rus
cy cling in a ter res trial eco sys tem with four blanks
(A-D). Iden tify the blanks.

A B C D

(a) Rock minerals Detritus Litter fall Producers

(b) Litter fall Producers Rock minerals Detritus

(c) Detritus Rock minerals Producers Litter fall

(d) Producers Litter fall Rock minerals Detritus

67 .The element required for the activation of DNA and
RNA is
(a) Ca2+ (b) Cu2+ (c) Mg2+ (d) K+

68 .Correct sequence of hormone secretion from
beginning of menstruation is
(a) FSH, progesterone, oestrogen
(b) oestrogen, FSH, progesterone
(c) FSH, oestrogen, progesterone
(d) oestrogen, progesterone, FSH

69 .Which of the fol low ing is wrongly matched?
(a)Transcription – writing information from DNA to tRNA
(b)Translation – using information in mRNA to make protein
(c)Repressor protein – binds to operator to stop enzyme
synthesis
(d)Operon – structural genes, operator and promoter

70 .Which en zyme/s will be pro duced in a cell in which
there is a non-sense mu ta tion in the lac y gene?
(a) β-galactosidase
(b) Transacetylase
(c) Lactose permease
(d) Lactose permease and transacetylase

71 .Which of the fol low ing is a char ac ter is tic fea ture of
dinoflagellates?
(a) They are golden-brown coloured
(b) They are motile and unicellular
(c) Have bioluminescence
(d) All of the above

72 .Pla centa and pericarp are both ed ible por tion in
(a) apple (b) banana
(c) tomato (d) potato

73 .DNA fin gerprint ing is used for the de tec tion of
crim i nals, pa ter nity test, etc. What is the ba sis of DNA
fin gerprint ing?
(a)The relative amount of DNA in the ridges and grooves of the
fingerprint

(b)Satellite DNA occurring as highly repeated short DNA

segments

(c)The relative proportions of purines and pyrimidines in DNA

(d)The relative difference in the DNA occurrence in the blood,

skin and saliva

74 .Ex am ine the fig ure given be low and se lect the right

op tion giv ing all four parts (A,B,C and D) cor rectly

iden ti fied.

(a) A–Archegoniophore

C–Gemma cup

B–Female thallus

D–Rhizoids

(b) A–Archegoniophore

C–Bud

B–Female thallus D–Foot

(c) A–Seta C–Protonema B–Sporophyte D–Rhizoids

(d) A–Antheridiophore

C–Globule

B–Male thallus

D–Roots

75.If 6 n is the num ber of ge no types, where ‘n’ is the num ber

of dif fer ent chro mo some pairs with each car ry ing one

het ero zy gous al leles, what would be the dif fer ent

ge no types pro duced by gar den pea plant?

(a) 614 (b) 612

(c) 67 (d) 610

Hint Pea plant have 7 pairs of contrasting character

76 .In the absence of fer til iza tion, cor pus luteum

(a) stops secreting progesterone

(b) changes to corpus albicans

(c) starts producing progesterone

(d) starts producing hCG

77 .Ar range the fol low ing op tion in as cend ing or der of

their BOD value.

I.Sample of highly polluted pond water.

II. Sample from unpolluted pond water.

III. Distilled water.

(a) III, I, II (b) II, III, I

(c) III, II, I (d) I, III, II

78 .Con sider the state ment given be low and choose the

correct code.

I.Recessive trait can only be expressed in

homozygous condition.

II. Recessive trait can only be expressed in

heterozygous condition.

III. Dominant trait is expressed in homozygous

condition.

IV. Dominant trait cannot be expressed in

heterozygous conditions.

Codes

(a) I, II and III (b) Only I

(c) II and IV (d) II, III and IV

Consumers C

A

Soil solution

B Run-off

D

uptake

A

B

C

D