| (i) Discuss some points which Prateek would have discussed with his friend. |
| (ii) What values are shown by Prateek? |
| Pollination is not necessary in apomixis. Give reason. |
| Or |
| Human placenta acts as a structural and functional unit between the foetus and maternal body. Justify the statement by giving any two basic functions it performs. |
| Microorganisms | Product | Biological activity | Medical ointment/Procedure |
| A | Streptokinase | Clot buster | D |
| Trichoderma polysporum | B | C | Transplant surgery |
| (i) List any two conditions on which the development of a diploid cell depends. |
| (ii) If the number of chromosomes present in the meiocyte of a plant is 24, then workout the number of chromosomes in the gamete and zygote of this plant. |
| (i) Identify the type of ecological pyramid and explain what does the base and the apex of this pyramid indicate? |
| (ii) Give examples of such type of ecological pyramids with respect to number and biomass.) |
 |
| (i) Give the expanded form and causative agent of AIDS. |
| (ii) How does transmission of AIDS occur? |
| (iii) According to your view, demand of Ankit's colleagues is valid or not? What values are shown by Ankit's colleague? |
| (i) Write about the process of fermentation and how does it take place? |
| (ii) List some important applications of microbes in different industries. |
| (iii) What values are shown by the teacher? |
| Enlist the main differences between the two types of nucleic acids found in living systems. |
| Or |
| Study the figure given below and answer the following questions |
 |
| (i) Identify the molecule 'X' synthesised by 'i' gene. How does this molecule get inactivated? |
| (ii) Identify the structural gene that codes for \[\beta \]-galactosidase. |
| (iii) When does the transcription of this gene get stopped? |
| (i) What is an endosperm? |
| (ii) Endosperm development preceedes embryo development. Explain. |
| (iii) What is the fate of endosperm in angiosperms? |
| Or |
| (i) Geitonogamy is functionally a cross-pollination, but genetically similar to autogamy. Explain. |
| (ii) Why do flowering plants need to develop outbreeding devices? Explain any there such devices developed by flowering plants. |
| A single mutant allele is responsible for the abnormal form of haemoglobin\[(i.e.\text{ }H{{b}^{5}})\]. If it is present in a homozygous state \[(H{{b}^{s}}H{{b}^{s}}),\] person develops sickle-cell anaemia, but if the allele is found in heterozygous state \[(H{{b}^{A}}H{{b}^{S}})\], the person only shows few symptoms for the disease. On the basis of the above situation, work out a cross for a condition in which a woman, who is homozygous for allele marries a male who is heterozygous for the allele? Indicate the probability of having a normal or a diseased child for each of her pregnancies. Also, state the advantage that is conferred by the heterozygous condition of gene \[H{{b}^{S}}\]. |
| Or |
| Haemophilia and colour blindness are sex-linked recessive disorders determined by the alteration or mutation in the single gene. Mention the pattern of inheritance of both disorders in human beings with the help of a cross. |
| Given below is the type of global biodiversity representing the proportionate number of species of major taxa of plants. Observe it carefully and answer the questions that follow. |
 |
| Representation of global biodiversity of major taxa of plants |
| (i) Identify the most endangered group of plants among all categories. |
| (ii) What may be the reason behind such less population of mosses and ferns? |
| (iii) Name the most advanced and the most primitive group of plants in the biodiversity given above. |
| (iv) Fungi, inspite of being heterotroph are able to sustain themselves as a large population. Explain. |
| Or |
| With the help of a flowchart, explain what are the various major approaches to conserve biodiversity? |
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