Q. A burglar in a huff forgot to wipe off his blood stains from the place of crime where he was involved in a theft. Name the technique which can help in identifying the burglar from the blood stains. Describe the technique.

Q. Exlpain DNA polymorphism as the basis of genetic mapping of human genome.

Q. Write the basis on which an organism occupies a space in its community/natural surroundings.

Q. Write the function of adenosine deaminase enzyme. State the cause of ADA deficiency in humans. Mention a possible cure for a ADA deficiency patient.

Q. Expand the following and mention one application of each:
(i) PCR (ii) ELISA

Q. Write the equation that helps in deriving the net primary productivity of an ecosystem.

Q. Write the Oparin and Haldane's hypothesis about the origin of life on earth. How does meteorite analysis favour this hypothesis?

Q. In a typical monohybrid cross, F${}_2$ population ratio is written as 3: 1 for phenotype but expressed as 1: 2: 1 for genotype. Explain with the help of an example.

Q. Three Mark Questions.
(a) Explain "birth rate" in a population by taking a suitable example.
(b) Write the other two characteristics which only a population shows but an individual cannot.

Q. Name the phenomenon and one bird where the female gamete directly develops into a new organism

Q. What is meant by "alien species" invasion? Name one plant and one animal alien species that are a threat to our Indian species.

Q. Name the type of biodiversity represented by the following.
(a) 50, 000 different strains of rice in India
(b) Estuaries and alpine meadows in India

Q. Write the importance of MOET.

Q. What is detritus food chain made up of? How do they meet their energy and nutritional requirement?

Q. Name any two source of e-waste and write two different ways for their disposal

Q. Two mark Questions:
Name the haploid cells present in an unfertilized mature embryo sac of a flowering plant. Write the total number of cells in it.

Q. When and where do chorionic villi appear in humans? State their function.

Q. A student on a school trip started sneezing and wheezing soon after reaching the hill station for no explained reasons. But, on return to the plains, the symptoms disappeared. What is such a response called? How does the body produce it?

Q. Name two commonly used bioreactors. State the importance of using a bioreactor.

Q. "Stability of a community depends on its species richness". Write how did David Tilman show this experimentally.

Q. Name an algae that reproduces asexually through zoospores. Why are these reproductive units so called?

Q. (a) Write the specific features of the genetic code AUG.
(b) Genetic codes can be universal and degenerative. Write about them, giving one example of each.
(c) Explain aminoacylation of tRNA.

Q. In a cross between two tall pea plants some of the offsprings produced were dwarf. Show with the help of Punett square how this is possible.

Q. Why sharing of injection needles between two individuals is not recommended?

Q. Geitonogamous flowering plants are genetically autogamous but functionally cross-pollinated. Justify.

Q. How does the process of natural selection affect Hardy-Weinberg equilibrium? Explain. List other four factors that disturb the equilibrium.

Q. Identify the examples of convergent evolution from the following.
(i) Flippers of penguins and dolpins
(ii) Eyes of octopus and mammals
(iii) Vertebrate brains

Q. Why is the enzyme cellulase needed for isolating genetic material from plant cells and not from the animal cells?

Q. Mention the contribution of S.L. Miller's experiment on Origin of Life.

Q. Name the enzyme and state its property that is responsible for continuous and discontinuous replication of the two strands of a DNA molecule.