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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.
Bt cotton is resistant to pests, such as lepidopterans, dipterans and coleopterans. Is Bt cotton resistant to other pests as well?
2.
What is the difference between a primary oocyte and a secondary oocyte ?
3.
Given below is the sequences of the coding strand of DNA in a transcription unit 3' AATGCAGCTATTAGG -5'. write the sequence of:
a) It's complementary strand
b)The mRNA.
4.
Strict conditions are to be followed in Medical Termination of Pregnancy (MTP) procedures.mention two reasons.
5.
STDs can be considered as self-invited diseases.Comment.
6.
In which year was the Air ( Prevention and Control of Pollution) Act amended to include noise as air pollutant?
7.
Would you choose an exonuclease for producing a recombinant DNA molecule?
8.
Why is genetic variation important in the plant Rauwolfia vomitoria?
9.
According to David Tilman, grater the diversity, greater is the primary productivity. Can you think of a very low diversity man-made ecosystem that has high productivity?
10.
What is common to earthworm,soil mites and dung beetles in an ecosystem?
11.
How much of the net primary productivity of a terrestial ecosystem is eaten and digested by herbivores?
12.
If a population of 50 Paramoecium present in a pool increases to 150 after an hour, what would be the growth rate of the population?
13.
What would be the growth curve pattern, when the resources are unlimited?
14.
Why are proteins synthesised from spirulina called single cell proteins?
15.
Why are plants obtained by protoplast culture called somatic hybirds?
16.
If a patient is advised Anti-retroviral theraphy, which infection is he suffering from?Name the causative organism.
17.
How do we compute the age of a fossil?
18.
What will be the ratio of 15N/15N :15N/14N : 14N/14N containing DNAs,if Meselson and Stahl experiment is cotinued for four generations in the bacteria?
19.
In some viruses DNA is synthesised using RNA template. What term is given to such a DNA?
20.
Even if a character shows multiple allelism an individual will only have two allels for that character. Why?
21.
What is the cross between the progeny of F1 and the homozygous recessive parent called? How is it useful?
22.
Mention two inhercent characteristics of Amoeba and yeast that enable them to reproduce asexually.
23.
Name the part of gynoecium that determines the compatible nature of pollen grain.
24.
What is the significance of ampullaryisthmic junction in the female reproductive tract?
1.
Bt cotton is made resistant to only certain specific taxa of pests. It is quite likely that in future some other pests may infest this Bt cotton.
2.
Primary oocyte is a diploid cell formed in foetal ovary when the gamete mother cell, oogonia is arrested at prophase-I of meiosis. Secondary oocyte is the haploid cell formed from primary oocyte that completes its first meiotic division, during puberty and produces the female gamete ova (n).
3.
( )
a) 5'-TTACGTCGATAATCC-3'
B) 3'-AAUGCAGCUAUAGG-5'
4.
( )
1. MTP is generally advised during first trimester of pregnancy as it becomes more and riskier as after this period fetus becomes more intimately associated with the uterine wall tissue.
2. Various methods of MTP require the help of qualified doctors.
3. To prevent illegal female foeticide.
5.
( )
Sexually Transmitted Diseases (STDs) can be considered self-invited diseases because these diseases develop due
to our own unsafe habits. But one could be free of these infections by following the simple principles given below
(i) Avoid sex with unknown partners/multiple partners.
(ii) Always use condoms during coitus.
(iii) In case of doubt one should go to a qualified doctor for early detection and get complete treatment if
diagnosed with disease.
If all the above said precautions are not strictly adopted by people, they are inviting STDsto infect them.
6.
( )
1987
7.
( )
No, because exonucleases will remove the nucleotides from the ends DNA molecule and not at any particular desired region.
8.
( )
Genetic variation is important as it affects the production of the drug reserpine in the medicinal plant Rawwolfia.
9.
( )
Agricultural or crop fields ( like wheat or rice field) have high productivity.
10.
( )
They are all detritivores.
11.
( )
10 per cent.
12.
( )
100 per hour.
13.
( )
J - shaped growth curve.
14.
( )
The protein produced by microbes, is called single cell protein.
15.
( )
Since the plants is produced by the fusion of two different somatic cells, it is called a somatic hybird
16.
( )
1. He is suffering from Acquired Immuno Deficiency Syndrome (AIDS).
2. Human Immunodeficiency virus (HIV).
17.
( )
The age of a fossil is calculated by radioactive (carbon) radiation.
18.
( )
15N/15N O :15N/14N 2 : 14N/14N 14
19.
( )
Complementary DNA (cDNA)
20.
( )
A diploid individual has only two sets of homologous chromosomes; hence only two alleles of a gene can be present on the homologous pair of chromosomes.
21.
( )
- It is called a test cross.
- It helps to determine the genotype of the F1 individual with dominant phenotype.
22.
( )
(i) Amoeba and yeast are single-called organisms.
(ii) They have a relatively simple organ-isation of cells.
23.
( )
Stigma
24.
( )
Ampullary-isthmic junction is the site in the fallopian tube where fertilisation occurs.
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