(i) What are the factors that account for the formation of major biomes? |
(ii) Name any two major biomes of India. |
(iii) What values are shown by Ritesh? |
Why are beads on string - like structures seen in the nucleus of an eukaryptic cell under electron microscope? |
Or |
Answer the following questions based on sex - determination |
(i) Which type of sex - determination does occur in some butterflies and moths? |
(ii) Why is it exactly opposite from that of cockroaches and grasshoppers? |
(i) Give the labelled diagram of an anatropous ovule of angiosperms. |
(ii) How is micropyle of ovule important for seed? |
(i) Life begins from a single cell in all sexually reproducing organisms. Justify. |
(ii) Describe the process of sporulation in Amoeba. |
What is the male gametophyte of an angiospermic plant? Draw its structure by labelling its four major parts. |
Or |
What are the disadvantages of vegetative reproduction? |
(i) Religious beliefs proved to be helpful in the conservation of biodiversity. Comment? |
(ii) What are the different zones of a biosphere reserve? |
(i) Being a brilliant student of class, can you tell the palindrome sequence of EcoRI restriction enzyme? |
(ii) What is the function of palindromic sequence in a DNA molecule? |
(iii) What values were shown by the teacher? |
(i) Write its different types. |
(ii) Mention its causes. |
(i) Describe the formation of placenta. |
(ii) Name the hormones secreted by placenta. |
(iii) What values are shown by Vibha's doctor? |
(i) Diagrammatically represent the experimental steps in cloning and expressing a human gene, into a bacterium like E. coli. |
(ii) Mention the type of host cells suitable for the gene guns to introduce an alien DNA. |
(i) How are the following involved in protecting human body from invading pathogens? |
(a) Lymph nodes |
(b) Plasma cells |
(c) Cytotoxic T - cells |
(ii) Why secretion of IgE antibodies and histamine is not beneficial for humans during allergy? |
Or |
HIV (retrovirus) does not follow central dogma, then how does it replicates inside the host cell? Explain with diagram. |
How is phosphorus recycled in the nature? |
Or |
What do you understand by the following? |
(i) Mimicry |
(ii) Camouflage? |
DNA fingerprinting can help in solving a case of paternity dispute over the custody of a child by two different families. Do you agree? If yes, explain why? |
Or |
What conclusions were drawn by Darwin after his journey through a ship around the world? |
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