Differentiate between monohybrid cross and dihybrid cross. |
Or |
Explain how test cross helps in identifying the genotype of the organism. |
Given below is the diagrammatic representation of human's male gamete. Answer the questions that follow |
(i) Identify A, B and C. |
(ii) Write the functions of A and B. |
(i) Why did Anil's son started coughing due to vehicular exhaust? |
(ii) What values were shown by Anil? |
(i) Restriction endonucleases |
(ii) DNA polymerase |
(iii) DNA ligase. |
(i) Role of government and NGOs. |
(ii) Role of local people. |
(i) Why is DNA replication continuous and discontinuous on the two strands of DNA? |
(ii) Explain the importance of 'origin of replication' in a replication fork. |
(i) Psychedelic drugs are known as 'vision producing drugs'. Explain. |
(ii) Write the name of two such vision producing drugs and also mention the source from which they are obtained. |
(i) Mohan, a member of environment research team observed decline in bird population near a water body in Punjab. In later investigation, it was found due to the setting of an industrial unit in the same area. Explain the cause responsible for the decline observed. |
(ii) What values are shown by Mohan? |
Mention the products and their use, produced by each of the microbes listed below |
(i) Lactobacillus |
(ii) Saccharomyces cerevisiae |
(iii) Streptococcus |
Or |
How fishery can be used for enhancing food production? |
(i) How are these chemicals harmful to mankind? |
(ii) Suggest alternative methods to control pest. |
(iii) What values were shown by Aman? |
(i) Draw a labelled longitudinal section of an albuminous see |
(ii) How are seeds advantageous to flowering plants? |
Or |
Differentiate between microsporogenesis and megasporogenesis. Name the structures formed at the end of the two events. |
(i) How does a Mendelian disorder different from a chromosomal disorder? |
(ii) Name two chromosomal disorders. |
(iii) Give the name of two Mendelian disorders. |
Or |
(i) How is the ammo acid sequence of a polypeptide chain is related with nucleotide sequence of mRNA? |
(ii) Write the characteristics of genetic code. |
Increasing pollution and deforestation are two of the main environmental issues now - a - days. As a responsible citizen of India, what individual measures would you adopt to reduce environmental pollution? Can you also write two past events which can display people participation in saving our forests? |
Or |
(i) What do you understand by Slash and Burn cultivation? |
(ii) What is biomagnification? |
(iii) How can level of pollution be decreased by banning chemical fertilisers? |
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