Sample Paper of Biology 2014 for class 12, CBSE. Paper No.1
Sample Paper – 2014
Class – XII
Subject – Biology
Time: 3 Hrs M M : 70
* All questions are compulsory.
* The question paper consists of four sections A, B, C, D. Section A consists 8 questions of 1 mark each. Section B is of 10 questions of 2 marks each. Section C is of 9 questions of 3 marks each. Section D consists of 3 questions of 5 marks each.
* There is no overall choice. However an internal choice has been provided in 2 questions of 3 marks and all 3 questions of 5 marks.
Where ever necessary draw neat and labeled diagram.
- Which are the nuclei that fuse to form endosperm?
- What will be the ploidy of:
- Cells of microspore tetrad.
- Cells of nucleus.
- Match the column A with column B
| COLUMN Aa. Alec Jeffreys
d. Jacob and Monad
|COLUMN Bi. Transformation
iii. DNA finger printing
- Define Biofortification.
- Thermostable DNA is needed in amplification. Why?
- Name the enzyme used to digest cell walls of :
- Fungi , for genetic engineering
- What is a mutagen? Give two examples.
- Where did Chipkop movement start initially? Who was their leader?
- How is polyspermy prevented in humans?
- Expand IUD. Give examples. How it prevents fertilization?
- Identify the type of mutation occurring in the following diagram. Define this mutation. Write one feature related with disease caused by this mutation.
- What is a single cells protein? What is its significance?
- What is TI plasmid? Name the organism where it is found. How does it help in genetic engineering?
- Why the length of a food chain in an ecosystem is generally limited to four trophic levels. Explain with example.
- Expand the term CNG. Why is it more eco friendly than diesel?
- Explain with the help of two examples of pyramid of numbers and pyramid of biomass can look inverted.
- Differentiate between gene flow and genetic drift.
- List any four factors which may lead to the loss of biodiversity.
- Menstrual cycle completes in three phases. Name them. Also write changes occur in the following organs in different phases:
- Fallopian tubes
- Given below is the cross sectional view of microsporangium. Label four wall layers A, B, C and D. Give one function of each layer
- coli was cultured in medium containing 15NH4Cl. After first generation E. Coli transferred to culture medium 14NH4Cl. Give answers of following questions:
- Who performed this experiment?
- What is proven by this experiment?
- What is the time duration by which E. coli completes its first generation?
- At 40 minutes what would be the nature of the DNA.
- How various samples were separated independently?
- Define multiple-alleles and co-dominance. The following table shows genotype and phenotype of ABO blood groups. Fill the gaps.
|GENOTYPE||PHENO TYPE/BLOOD GROUPS|
- Give reasons for the following statements:
- Evolution is based on chance events in nature and chance mutation in organisms
- First evolved organisms were hetrotrophs and anaerobes.
Evolution is a continuous process. Give evidences for evolution from
- Morphology and anatomy
- Answer the question according to instructions given:
- Malaria: Pathogen name, Mode of transmission, incubation period
- Cocaine: Type of drug, obtained from, effects on
- How does bio-fertilizer enrich the fertility of soil?
What is sewage? Write differences between primary and secondary sewage treatment.
- Differentiate inbreeding and out breeding. What type of danger is associated with inbreeding? Name two animal breeds which are developed by cross breeding.
- Give scientific name of bacteria which produces crystal proteins. How are these proteins useful in agriculture? What is the difference between Cry and cry?
- Given below is a DNA segment which constitute gene.
- Will the whole gene be transcribed into RNA primarily
- Name the shaded and unshaded part.
- Explain how this gene expressed in cell.
- How this is different from prokaryotic gene in expression.
- What are the three types of RNAs?
- Which one of the three has shape of clover leaf in 2D structure? Draw and label its four parts.
- How remaining two RNAs are related to information flow in protein synthesis?
- What is gene therapy? Illustrate using the example of ADA disease
How does restriction enzyme function? Show it along with diagrammatic representation.
- Give source, effect of following pollutant:
Explain the difference between seral stage and climax community during succession. How succession differ in terrestrial and aquatic system