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  #2  
Old November 4th, 2014, 10:16 AM
AdityaV
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Join Date: Apr 2013
Posts: 28,553
Default Re: CBSE Class 12th Biology sample paper

Here you are looking for Biology sample paper of CBSE Class 12th, as you want here I am providing you.

CBSE Class 12th Biology sample paper

Time allowed: 3 hours
Maximum Marks: 70
Total 26 questions

Section A

1. How are flavr savr tomatoes different from normal tomatoes?

2. Name the type of chemical bond formed between two nucleotide units of a DNA molecule?

3. Why do we call restriction enzymes as molecular scissors?

4. How a Water Hyacinth plant becomes so very harmful to the pond ecosystem?

5. Write the source of Taq polymerase enzyme.


CBSE Class 12th Biology sample paper




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Attached Files
File Type: pdf CBSE Class 12th Biology sample paper1.pdf (107.0 KB, 39 views)
File Type: pdf CBSE Class 12th Biology sample paper2.pdf (108.0 KB, 17 views)
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Last edited by Aakashd; August 6th, 2018 at 10:40 AM.
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  #3  
Old February 21st, 2015, 12:35 PM
Avdhesh Raikwar
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Default 12th

me ek 12th class ka student hu air mera aap se nivedan had ki mujhe aap 12th Biology ka simpal paper Dene ki kirpa kre
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  #4  
Old June 4th, 2015, 05:22 PM
AdityaV
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Join Date: Apr 2013
Posts: 28,553
Default Re: 12th

You need CBSE 12th Class Biology subject question paper, here I am giving:
CBSE 12th Biology paper
Section A
1. Give one example of continuous variations and discontinuous variations.
2. Name the two primary lymphoid organs of human body?
3. When sexual reproduction adds variations then why should any angiosperm opt for vegetative propagation method?
4. Name the indicator species in polluted ganga water.
5. What are sacred groves?

Section B
6. What is the effect of alcohol on the human liver cells?
7. Write examples of any two albuminous and non albuminous seeds.
8. What are solid wastes? Give examples.
9. Explain male homogamety through a suitable example.
10. Describe the location and function of acrosome.

Or
Disclaimer: This paper has been taken from the public domain of the respective exam board and is distributed by Career Modifiers.

How is capacitation helpful in fertilization?
Section C
11. How biome and ecological niche terms differ from each other? Give examples of each.
12. Write the specific features of a nuclear endosperm with example also mention its difference from cellular and helobial endosperm?
13. If following is the sequence of structural gene:

5’ CAATAGCCTAGAGAT 3’ then find out the following :
a) the sequence of mRNA formed after transcription along with its polarity.
b) the sequence of bases on the coding strand and template strand of DNA.
or
Describe the traits governed by multiple genes and multiple alleles. Is there any difference in their pattern of inheritance? Explain.
14. Describe the process of gel electrophoresis. Name the carcinogenic dye used for staining DNA in this method.
15. T.H. Morgan through his experiments on Drosophila described the concept of linkage. How linkage effects the inheritance pattern of genes? It is also an exception to one of the Mendel’s law, mention that law.
16. Define inbreeding depression. How the harmful effects of inbreeding depression can be overcome?

or
a) What is heterosis?
b) Explain biofortification and mutation breeding methods of plant breeding to improve quality and quantity of yield.
17. Discuss the interactions of following with their hosts :

a) an epiphyte (with example)
b) a parasite ( with example)
c) a mycorrhizae fungus
18. Increasing concentration of Carbon dioxide in atmosphere is beneficial to plants for performing photosynthesis then why environmentalists consider it alarming to the ecosystem viability?

Disclaimer: This paper has been taken from the public domain of the respective exam board and is distributed by Career Modifiers.

19. What is species richness? If biodiversity is affected by altitude and latitude then where would you find greatest levels of species richness also mention why?
20. a)Define totipotency. How is this ability useful to the tissue culture method?

b) What are somaclonal variations? Do they have any significance in tissue culture?
21. What are CFCs? Explain their effect on global warming and ozone depletion.
22. Describe the adaptations that are shown by animals to resist and survive under unfavourable conditions.

Section D
23. A married couple visits a gynaecologist and tells her that even after repeated copulations the wife is not getting pregnant. Now read the following and answer:

a) If reproductive systems of both are working well what can be the possible reason for not conceiving?
b) If reproductive system of either one has a problem then what should be doctor’s advice?
Section E
24. a) Draw well labeled diagram of mature female gametophyte of an angiosperm.

b) Make a list of post fertilization changes that occurs in the angiosperms.
c) How is apomixis different from parthenocarpy.
or
Some angiospermic plants show self incompatibility. How incompatibility is significant to these plants? Discuss with suitable examples.
25. Explain stepwise the hypothesis of chemical evolution of life. Name the scientists who proposed it. Mention if it has got any experimental proof?

or
a) How does population change in Biston betularia is a description to natural selection occurrence?
b) What is genetic drift? How it leads to founder effect and bottleneck effect in populations.
26. Describe adaptive immunity development in the body. Write the type of cells and molecules involved in it. How is it different from innate immunity?.

or
Disclaimer: This paper has been taken from the public domain of the respective exam board and is distributed by Career Modifiers.

Explain causes, types and treatment of cancer. Define metastasis in cancerous cells.
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  #5  
Old February 3rd, 2019, 11:04 PM
Tanvi prajapati
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Posts: n/a
Default

Chemistry paper and biology answer




Quote:
Originally Posted by AdityaV View Post
You need CBSE 12th Class Biology subject question paper, here I am giving:
CBSE 12th Biology paper
Section A
1. Give one example of continuous variations and discontinuous variations.
2. Name the two primary lymphoid organs of human body?
3. When sexual reproduction adds variations then why should any angiosperm opt for vegetative propagation method?
4. Name the indicator species in polluted ganga water.
5. What are sacred groves?

Section B
6. What is the effect of alcohol on the human liver cells?
7. Write examples of any two albuminous and non albuminous seeds.
8. What are solid wastes? Give examples.
9. Explain male homogamety through a suitable example.
10. Describe the location and function of acrosome.

Or
Disclaimer: This paper has been taken from the public domain of the respective exam board and is distributed by Career Modifiers.

How is capacitation helpful in fertilization?
Section C
11. How biome and ecological niche terms differ from each other? Give examples of each.
12. Write the specific features of a nuclear endosperm with example also mention its difference from cellular and helobial endosperm?
13. If following is the sequence of structural gene:

5’ CAATAGCCTAGAGAT 3’ then find out the following :
a) the sequence of mRNA formed after transcription along with its polarity.
b) the sequence of bases on the coding strand and template strand of DNA.
or
Describe the traits governed by multiple genes and multiple alleles. Is there any difference in their pattern of inheritance? Explain.
14. Describe the process of gel electrophoresis. Name the carcinogenic dye used for staining DNA in this method.
15. T.H. Morgan through his experiments on Drosophila described the concept of linkage. How linkage effects the inheritance pattern of genes? It is also an exception to one of the Mendel’s law, mention that law.
16. Define inbreeding depression. How the harmful effects of inbreeding depression can be overcome?

or
a) What is heterosis?
b) Explain biofortification and mutation breeding methods of plant breeding to improve quality and quantity of yield.
17. Discuss the interactions of following with their hosts :

a) an epiphyte (with example)
b) a parasite ( with example)
c) a mycorrhizae fungus
18. Increasing concentration of Carbon dioxide in atmosphere is beneficial to plants for performing photosynthesis then why environmentalists consider it alarming to the ecosystem viability?

Disclaimer: This paper has been taken from the public domain of the respective exam board and is distributed by Career Modifiers.

19. What is species richness? If biodiversity is affected by altitude and latitude then where would you find greatest levels of species richness also mention why?
20. a)Define totipotency. How is this ability useful to the tissue culture method?

b) What are somaclonal variations? Do they have any significance in tissue culture?
21. What are CFCs? Explain their effect on global warming and ozone depletion.
22. Describe the adaptations that are shown by animals to resist and survive under unfavourable conditions.

Section D
23. A married couple visits a gynaecologist and tells her that even after repeated copulations the wife is not getting pregnant. Now read the following and answer:

a) If reproductive systems of both are working well what can be the possible reason for not conceiving?
b) If reproductive system of either one has a problem then what should be doctor’s advice?
Section E
24. a) Draw well labeled diagram of mature female gametophyte of an angiosperm.

b) Make a list of post fertilization changes that occurs in the angiosperms.
c) How is apomixis different from parthenocarpy.
or
Some angiospermic plants show self incompatibility. How incompatibility is significant to these plants? Discuss with suitable examples.
25. Explain stepwise the hypothesis of chemical evolution of life. Name the scientists who proposed it. Mention if it has got any experimental proof?

or
a) How does population change in Biston betularia is a description to natural selection occurrence?
b) What is genetic drift? How it leads to founder effect and bottleneck effect in populations.
26. Describe adaptive immunity development in the body. Write the type of cells and molecules involved in it. How is it different from innate immunity?.

or
Disclaimer: This paper has been taken from the public domain of the respective exam board and is distributed by Career Modifiers.

Explain causes, types and treatment of cancer. Define metastasis in cancerous cells.
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