SCERT Kerala Class XII Biology Sample Question Paper 2015

Organisation : State Council of Educational Research & Training
Exam : Higher Secondary Education Exam
Subject : Biology
Document Type : Sample Question Paper
Year : 2015
Class : XII STD

Website : http://www.scert.kerala.gov.in
Download Sample Question Paper : https://www.pdfquestion.in/uploads/8457biologyXII.pdf

Biology Class XII Sample Question Paper :

Maximum : 60 Scores
Time: 2 hrs
Cool off time : 20 Minutes
Preparatory time : 5 Minutes

Related : SCERT Kerala Class XII Political Science Sample Question Paper 2015 : www.pdfquestion.in/8454.html

General Instructions to candidates:
** There is a ‘Cool off time’ of 10 minutes each for Botany and Zoology in addition to the writing time of 1 hour each. Further there is 5 minutes ‘preparatory time’ at the end of Botany examination and before the commencement of Zoology examination.
** You are neither allowed to write your answers nor to discuss anything with others during the ‘cool off time’ and preparatory time.
** Use the ‘cool off time’ to get familiar with questions and to plan your answers.
** Read the questions carefully before answering.
** All questions are compulsory and only internal choice is allowed.
** When you select a question, all the sub-questions must be answered from the same question itself.
** Calculations, figures and graphs should be shown in the answer sheet itself.
** Malayalam version of the questions is also provided.
** Give equations wherever necessary.
** Nonprogrammable calculators are allowed in the Examination Hall.

1. Polymerase Chain Reaction helps in ………………..
(A) DNA synthesis
(B) DNA amplification
(C) Protein synthesis
(D) Aminoacid synthesis

2. Name a unicellular fungus which reproduces asexually by producing small buds. (1)
3. Which of the following animal is not a hermaphrodite?
(A) Tapeworm
(B) Leech
(C) Earthworm
(D) Cockroach

4. Decomposition is the breakdown of complex organic matter into simple inorganic substances. Which are the important steps in the process of decomposition. (2)

5. Plants, bacteria, fungi and animals whose genes have been altered by manipulation are called Genetically Modified Organisms. Write any four uses of GMO.(2)

6.A. A novel strategy was adopted to prevent the infection of nematode worms in tobacco plants. It is known as RNA interference. How does this strategy operate in tobacco plants? (2)
(OR)
B. The main challenge for the production of insulin using rDNA technique was getting insulin assembled into a mature form. How did Eli Lilly company overcome this challenge. (2)
7. Adaptation is any attribute of the organism that enables the organism to survive and reproduce in its habitat. Write any two morphological adaptations shown by desert plants. (2)
8. A diagrammatic representation of the mature embryo sac is given below. Copy the diagram in your answer sheet and label the parts noted as A, B, C and D. (2)
9. A simplified model of phosphorus cycling in a terrestrial ecosystem is given below. Fill up the blank columns of this flow chart.
10. Mutualism is the interaction which confers benefits on both the interacting species. Write two examples for mutualism among organisms. (2)
11.a.Which cell division results in the production of megaspores from Megaspore Mother Cell?
b. Write down the major difference between microsporogenesis and megasporogenesis in flowering plants.

12.a.Which of the following is a suitable example for semi dwarf variety of wheat.
(A) IR-8 (B) Ratna
(C) Sonalika (D)Taichung Native I
b. What is biofortification? Suggest any two objectives of biofortification. (3)
13.A.The following are the major steps of Recombinant DNA technology. Arrange them in correct sequential order.
1. Obtaining the foreign gene product
2. Amplification of gene of interest using PCR
3. Downstream processing
4. Cutting of DNA at specific locations
5. Insertion of recombinant DNA into the host cell/organism.
6. Isolation of genetic material
(OR)
B. Genetic Engineering can be accomplished only if we have some key tools. Restriction Endonuclease is such a tool. Suggest the method of naming of Restriction Endonucleases with reference to EcoRI. (3)
14.a.Which of the following is a greenhouse gas?
(A) Carbon monoxide
(B) Carbon dioxide
(C) Nitrogen
(D) Ozone
b. Increase in the level of greenhouse gases has led to considerable heating of earth leading to global warming. How can we control global warming? (4)
[embeddoc url=”https://www.pdfquestion.in/uploads/8457biologyXII.pdf”]