CBSE BIOLOGY MODEL TEST PAPER-II CLASS XII

1.How does biochemistry provide evidence for organic evolution?
2.Expand NACO.
3.Name the varieties of rice from which semi-dwarf varieties have been developed.
4.Mention the commercial use of lipase.
5.What is meant by carrying capacity of environment?
6.Define the term ‘induction’ with reference to gene expression.
7.Why antibody mediated immunity is is termed as humoral immunity?
8.What are ectotherms?
9.Explain any two methods of vector less gene transfer.
10.What are the harmful effects of chemical pesticides?
11.What is vaccination? How does it help in producing immunity?
Or enlist the characters that breeders have tried to incorporate into crop plants.
12.What is seminal plasma? Mention its components.
13.Differentiate between estrous cycle and menstrual cycle.
14.Why logistic growth model is considered more realistic in nature? Explain.
15.Define- plasmid, biotechnology.
16.How does temperature affect living organisms?
17.Who discovered mutations? Write the scientific name of the plant he worked on.
18.Bring out the advantages of molecular diagnostics over conventional method.
19.Describe phosphorous cycle that operates in nature.
20.Explain what is meant by biofortification.
21.Write the scientific name of the organism that causes amoebiasis. How does it spread?
22.Describe the process of decomposition.
23.Describe gene therapy with reference to ADA deficiency.
Or describe the different methods of introducing the rDNA into a competent host cell.
24.Explain the following terms in one or two sentences- (i) MALT (ii) humulin (iii) biofortified food.
25.What is convergent evolution? What other name is given to it? Give an example of convergent evolution.
26.Mention any four advantages of single cell proteins. Give an example.
27.Give examples to show how introduction of exotic species can affect the biodiversity of a given region?
28.How are genetic disorder broader classified? Explain with two examples of each.
Or Who demonstrated semi conservative replication of DNA? Explain the procedure in detail.
29.Describe the hormonal control of parturition in human female in detail. Or (i) differentiate between true fruit and false fruit with one example in each. (ii) Draw a labeled diagram of L.S. of an apple.
30.Describe briefly the defunct ships and e-wastes. Or (i) What is Eutrophication? How does it affect the aquatic life? Explain. (ii) Describe chipko movement.

CBSE BIOLOGY MODEL TEST PAPER-I CLASS XII

1.Mention the brain capacities of (i) Homo habilis (ii) Neanderthal man.
2.Bring out the relationship between BOD and the organic matter in sewage.
3.Why is genetic code said to be degenerate?
4.What is meant by species composition of an ecosystem?
5.Name the common ancestor of man and ape.
6.What is the role of bacteria in the production of Swiss cheese?
7.Mention two adaptations found in desert plants.
8.What are Darwin’s finches?
9.Differentiate between zoospore and a zygote.
10.Write four characteristics symptoms of Turner’s syndrome.
11.Define spermiogenesis and spermiation.
12.What are lymph nodes? What is their function in our immune system? Or mention the factors responsible for the success of green revolution.
13.What is a tumour? Mention its two types.
14.Biomass is more meaningful measure of population size. Explain with an example.
15.Differentiate between gene flow and genetic drift.
16.Bring out the advantage of molecular diagnosis over conventional method.
17.Name the chemical and their source cells which cause allergic response in our body.
18.How does temperature affect the living organisms?
19.Define ecological diversity. Represent schematically how it is related to genetic and species diversity.
20.What are transgenic bacteria? Illustrate with an example. Or What are the critical areas of biotechnology?
21.Enlist the symptoms of ascariasis. How does it spread?
22.Bring out the limitations of ecological pyramids.
23.Why are cloning vectors necessary in genetic engineering? Name any two such vectors that are used in experiments with E. coli. Or What is meant by down stream processing? Describe the same.
24.Enlist the measures one has to take to preventing contracting of STD’s.
25.Mention the three connotations of theory of special creations.
26.What is meant by the term ‘breed’? What are the objectives of animal breeding?
27.Describe the naming of restriction enzymes with an example.
28.Draw labeled diagram showing the parts of human male reproductive system. Label ten parts in it. Or trace the development of megaspore mother cell of a flower into a mature ovule. Give a labeled diagram of the final stage.
29.Discuss briefly the municipal solid wastes. Or what is global warming? List four strategies of reducing global warming.
30.Describe in detail the technique of DNA finger printing. Or (i) Why is DNA and not RNA, the genetic material of many organisms. (ii)Differentiate between euchromatin and heterochromatin.