(i) What according to you, Neeta must have said to her mother in regard to participate in the competition? |
(ii) What values of Neeta are reflected by this incidence? |
(i) Which of the figures shows commensalism and mutualism? |
(ii) Give one difference between the interactions shown above. |
(i) Zoospore and zygote |
(ii) Homothallic and heterothallic |
A child met with an accident is administered tetanus antitoxin and not a tetanus vaccine. Give reason. |
Or |
Biofortified maize and wheat are considered to be nutritionally much improved than the original crops. State any two reasons. |
(i) How do terminal buds help in obtaining virus-free plants? |
(ii) Name any two plants which are commonly developed from meristems. |
(iii) What values are shown by Mohan? |
(i) Pollen-pistil interaction is an essential step in fertilisation of angiosperms. Justify. |
(ii) What steps are involved in this process? |
(i) What does happen when Meloidogyne incognita consumes cells with RNAi gene? |
(ii) How Agrobacterium vectors are useful in genetic engineering? |
It has been recorded that the temperature of earth has increased by\[0.6{}^\circ C\]during the past century. |
(i) What has caused this increase? |
(ii) Explain its consequences. |
Or |
Due to uncontrolled excessive hunting, the population of tigers in a forest has reached to zero. Discuss the long term effects of this situation on the population of deer in that forest. |
Study the pedigree chart given above, showing the inheritance pattern of blood groups in a family and answer the following questions. |
(i) Give the possible genotypes of the individual 1 and 2. |
(ii) Which antigen(s) will be present on the plasma membranes of RBCs of individual 5 and 10? |
(iii) Give the genotype of the individuals 3 and 4. |
(i) List any six measures you think every person should follow for good personal hygiene. |
(ii) What values are shown by the doctor? |
(i) Identify the hormones marked as 'X' and 'Y'. |
(ii) Name the ovarian phases of menstrual cycle during the following periods |
(a) 5th - 12th day of the cycle. |
(b) 14th day of the cycle. |
(c) 16th - 25th day of the cycle. |
(iii) What influence do hormones 'X' and 'Y' have on different ovarian events stated in (ii) (a), (b) and (c)? |
Or |
Male and female gametes in human beings differ from each other in both structure and function. Enumerate some major differences between the two, alongwith their diagram. |
Study the graph given below and answer the questions that follow. |
(i) What does BOD stand for? Explain the term. |
(ii) What is the relationship between dissolved oxygen and BOD? |
(iii) Mention the effect of higher BOD value on aquatic life in the river. |
Or |
(i) Draw a pyramid of numbers of a situation, where a large population of insects feed upon a very big tree. The insects inturn are eaten by small birds which inturn are fed upon by large birds. |
(ii) Differentiate giving reasons between the pyramid of biomass of the above situation and the pyramid of number that you have drawn. |
We are told that evolution is a continuing phenomenon for all living things. Are humans also evolving? Justify your answer. |
Or |
(i) Explain the observations and the conclusion drawn by Darwin during his visit to Galapagos islands. |
(ii) Write the two key concepts of Darwin's theory of evolution. |
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