Name the host and the site where the following occur in the life cycle of a malarial parasite. |
(i) Formation gametocytes |
(ii) Fusion of gametocytes |
OR |
Briefly write the preventive measures for water and food borne diseases |
Describe the technique by which genetic disorder in a developing foetus can be detected. |
OR |
Describe three manners in which fertilisation of human ovum by a sperm can be prevented. |
Explain the following terms with example. |
(i) Codominance |
(ii) Incomplete dominance |
(i) You are given tall pea plants with yellow seeds, whose genotypes are unknown. How would you find the genotype of these plants? Explain with the help of cross. | |
(ii) Identify A, B and C in the table given below. | |
Pattern in Inheritance | Monohybrid \[{{F}_{1}}\] Phenotypic |
Codominance | A' |
B' | Progeny resembled only one of the parents |
Incomplete dominance | C' |
Study the figure given below and answer the following questions. |
(i) Name the molecule 'X' synthesised by 'i' gene. How does this molecule get inactivated? |
(ii) Which one of the structural genes codes for \[\beta \]-galactosidase? |
(iii) When will the transcription of this gene stop? |
The outline structure of a drug is given below. |
(i) Which group of drugs does this represent? |
(ii) What are the modes of consumption of these drugs? |
(iii) Name the organ of the body which is affected by consumption of these drugs. |
Draw a schematic sketch of pBR322 plasmid and label the following in it. |
(i) Any two restriction sites |
(ii) Ori and rop genes |
(iii) Any two antibiotic resistant genes |
Distinguish between the following, |
(i) Production and Decomposition |
(ii) Litter and Detritus |
(iii) Primary productivity and Secondary productivity |
Arun visited his grandfather's farm and noticed that one of the workers was introducing earthworms in the soil. He quickly rushed to his grandfather and asked him the reason. His grandfather explained him the advantages of earthworm in soil improvement as it helps in decomposition of complex organic matter. |
(i) Why are earthworms also known detritivores? |
(ii) Explain fragmentation. |
(iii) Name the steps in the process of decomposition. |
(iv) What values are shown by Arun? |
(i) State whether the following statements are True (T) or False (F), correct the false ones. |
(a) All sexually transmitted diseases are completely curable. |
(b) Infertility is defined as the inability to produce a viable offspring and is always due to abnormalities or defects in the |
(c) In ET techniques, embryos are always transferred into the uterus. |
(ii) What do you understand by the term test-tube baby? |
OR |
Study the flow chart given below. Give the name of the hormones involved at each stage and explain their role. |
(i) Define fossils. Give any two ways in which the study of fossils support biological evolution of an organism |
(ii) What is the study of fossils called? Write few points as to how the fossils throw light on past life. |
OR |
How is Human Genome Project HGP) advantageous for the mankind? Which objectives were associated with it? |
Give an overview of the process of sewage tratment. |
OR |
(i) (a) How is activated sludge produced during sewage treatment? |
(b) Explain how this sludge is used in biogas production. |
(ii) What are the differences between primary sludge and activated sludge? |
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