Name an organism where cell division is itself a mode of reproduction.

What is parthenogenesis? Give two examples from animals.

What is colostrum? Write its significance.

Draw a labeled sketch of a spermatozoan.

Select the correct term from the bracket and complete the given branching tree

(Barriers, Lactational amenorrhoea, CuT, Tubectomy)

Which method do you suggest the couple to have a baby, if the male partner fails to inseminate the female or due to very low sperm count in the ejaculate?

What is criss-cross inheritance?

Give reasons: ‘Genetic code is universal’.

Mention any two ways in which single nucleotide polymorphism (SNPs) identified in human genome can bring revolutionary change in biological and medical science.

In E.coli, three enzymes β- galactosidase, permease and transacetylase are produced in the presence of lactose. Explain why the enzymes are not synthesized in the absence of lactose.

Given below are some human organs. Identify one primary and one secondary lymphoid organ. Explain its role. Liver, thymus, stomach, thyroid, tonsils.

What are interferons? Mention their role.

Give any two bioactive molecules produced by microbes and state their uses.

What is genetically engineered Insulin?

Gene therapy is an attempt to correct a Genetic defect by providing a normal gene into the individual. By this the function can be restored. An alternate method would be to provide gene product known as enzyme replacement therapy, which would also restore the function. Which in your opinion is a better option? Give reasons for your answer.

Define ecological niche.

What is soil permeability?

Explain hibernation and aestivation with examples.

How many hotspots are there in India? Name them

Name the active chemical found in the medicinal plant Rauwolfia vomitoria. What type of diversity it belongs to?

‘Red data book’-What do you know about it?

Why do animals have greater diversification than plant diversity?

Expand
(i) CFC
(ii) AQI
(iii) PAN

List all the wastes that you generate, at home, school or during your trips to other places. Could you very easily reduce the generation of these wastes? Which would be difficult or rather impossible to reduce?

What would Earth be like without the greenhouse effect?