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Published on: 24/05/2021
QB365 Provides the updated NCERT Examplar Questions for Class 12 Biology, and also provide the detail solution for each and every ncert examplar questions , QB365 will give all kind of study materials will help to get more marks
Download CBSE Class 12th Standard CBSE Biology question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Biology
Questions + Answers key
Take MCQ Biology Test1.
Which of the following are the functions of RNA?
It is a carrier of genetic information from DNA to ribosomes synthesising polypeptides
It carries amino acids to ribosomes
It is a constituent component of ribosomes
All of the above
2.
In ecological succession, the climax community is best recognised by the following state
P = R
P > R
P < R
\(P\neq R\)
3.
In RNAi, genes are silenced using:
aa DNA
ds DNA
ds RNA
ss RNA
4.
Select the correct order of endosperm types
cellular, helobial, free nuclear
cellular, free nuclear, helobial
helobial, free nuclear, cellular
free nuclear, cellular, helobial
free nuclear, helobial, cellular
5.
Which of the following statements does not hold true for restriction enzyme?
It recognises a palindromic nucleotide sequence
It is an endonuclease
It is isolated from viruses
It produces the same kind of sticky ends in different DNA molecules
6.
Which one of the following products is used in cosmetics and polishes.
honey
oil
wax
royal jelly
7.
Which one of the following is a marine fish :
Rohu
Hilsa
Catla
Common carp
8.
To isolate protoplast, one needs :
pectinase
cellulase
both pectinase and cellulase
chitinase
9.
protoplast is:
another name for protoplasm
an animal cells
a plant cell without cell wall
a plant cell
10.
An antibiotic resistance gene in a vector usually helps in the selection of:
Competent cells
Transformed cells
Recombinant cells
None of these
11.
The biggest constraint of plant breeding is :
availability of desirable gene in the crop and its wild relatives
infrastructure
trained manpower
transfer of genes from unrelated sources
12.
Given below are a few statements regarding somatic hybridization.Choose the correct statements.
(i)protoplasts of different cells of the same plant are fused
(ii)protoplasts from cells of different species can be fused
(iii)treatment of cells with cellulase and pectinase is mandatory
(iv)the hybrid protoplast contains characters of only one parental protoplast.
(i) and (iii)
(i) and (ii)
(iii) and (iv)
(ii) and (iii)
13.
The term 'totipotency' refers to the capacity of a:
Cell to generate whole plant
bud to generate whole plant
seed to germinate
cell to enlarge in size
14.
Activated sludge should have the ability to settle quickly so that it can
be rapidly pumped back from sedimentation to aeration tank
absorb pathogenic bacteria present in waste water while sinking to the bottom of the settling tank
be discarded and anaerobically digested
absorb colloidal organic matter
15.
Methanogens do not produce
oxygen
methane
hydrogen sulfide
carbon dioxide
16.
The residue left after methane production from cattle dung is
burnt
burried in land fills
used as manure
used in civil construction
17.
Mycorrhiza does not help the host plant in:
Enhancing its phosphorus uptake capacity
Increasing its tolerance to drought
Enhancing its resistance to root pathogens
Increasing its resistance to insects
18.
Choose the correct answer regarding the ZIFT procedure?
Ova collected from a female donor are transferred to the fallopian tube to facilitate zygote formation.
Zygote is collected from a female donor and transferred to the fallopian tube.
Zygote is collected from a female donor and transferred to the uterus
Ova collected from a female donor and transferred to the uterus
19.
Given below are the four methods and their modes of action in achieving contraception.Select their correct matching from the four options that follows.
|
control measures |
Mode of Action |
| (A) Pill | 1. Prevents sperms reaching cervix |
| (B) Condom | 2. Prevents implication |
| (C)Vasectomy | 3. Prevents ovulation |
| (D) Copper T | 4. Semen contains no sperms |
| A | B | C | D |
| 3 | 4 | 1 | 2 |
| A | B | C | D |
| 2 | 3 | 1 | 4 |
| A | B | C | D |
| 3 | 1 | 4 | 2 |
| A | B | C | D |
| 4 | 1 | 2 | 3 |
20.
Caffeine is a stimulant present in
Coffee
Tea
Cold drinks
All of the these
21.
Bio fertilisers include:
Blue-green algae, rhizobia, other nitrogen fixing bacteria and mycorrhiza fungi
Blue-green algae, rhizobia and other nitrogen fixings bacteria
Rhizobia, other nitrogen fixing bacteria and mycorrhiza fungi
Blue green algae, rhizobia and mycorrhiza fungi
1.
(d)
All of the above
2.
(a)
P = R
3.
(c)
ds RNA
4.
(c)
helobial, free nuclear, cellular
5.
(c)
It is isolated from viruses
6.
(a)
honey
7.
(b)
Hilsa
8.
(c)
both pectinase and cellulase
9.
(c)
a plant cell without cell wall
10.
(b)
Transformed cells
11.
(d)
transfer of genes from unrelated sources
12.
(d)
(ii) and (iii)
13.
(a)
Cell to generate whole plant
14.
(a)
be rapidly pumped back from sedimentation to aeration tank
15.
(a)
oxygen
16.
(c)
used as manure
17.
(d)
Increasing its resistance to insects
18.
(b)
Zygote is collected from a female donor and transferred to the fallopian tube.
19.
(c)
| A | B | C | D |
| 3 | 1 | 4 | 2 |
20.
(d)
All of the these
21.
(a)
Blue-green algae, rhizobia, other nitrogen fixing bacteria and mycorrhiza fungi
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