Detritus food chain may be connected with grazing food chain at some levels. Justify. |
You are advised to attempt this sample paper without referring the explanations given here. However, cross check your explanations with the explanations given at the end of paper after you complete the paper. |
(i) What is interspecific hybridisation? |
(ii) How are mules produced? |
Differentiate between a zoospore and a zygote. |
Or |
A haploid organism produces gametes by mitosis. Does that mean meiosis never occur in such organisms? Justify your answer. |
(i) Which rice should be purchased and why? |
(ii) What values were exhibited by Khushi? |
(i) What is mutualism? |
(ii) Which type of interaction is shown by lichens? Explain. |
(i) What is speciation? |
(ii) How is Darwin's concept of evolution different from the views of Hugo de Vries? |
Or |
How do evidences support that evolutionary history of man is like that of any other organism? |
(i) What is charging of tRNA? |
(ii) Write the codon on mRNA and anticodon on tRNA for methionine amino acid? |
(iii) Write the structure of tRNA molecule. Name the codons which do not have any tRNA. |
(i) What are true fruits? Give an example. |
(ii) Why does banana not possess seeds? |
(iii) What values are shown by the teacher? |
(i) Name the technique used for the separation of DNA fragments. |
(ii) Write the type of matrix used in this technique. |
(iii) How is the prepared DNA visualised and extracted for use in recombinant technology? |
(i) Write the specific locations and functions of the following cells in human males. |
(a) Leydig cells |
(b) Primary spermatocytes. |
(ii) Explain the role of bulbourethral glands in human male reproductive system. |
(i) Discuss and work out Mendel's monohybrid cross upto \[{{F}_{2}}-\] generation by giving an example of seed colour as a trait in Pisum sativum. |
(ii) State the law of inheritance which can be derived from such a cross. |
(iii) How is the phenotypic ratio of \[{{F}_{2}}-\]generation of monohybrid cross different from that of dihybrid cross? |
Or |
The pattern of inheritance of ABO blood group is known to exhibit dominance, codominance and multiple allelism. Explain each concept with the help of blood group genotypes. |
(i) What are lymphoid organs? Write name of any four lymphoid organs and their functions. |
(ii) On what basis primary lymphoid organs and secondary lymphoid organs are categorised? |
Or |
(i) What is cancer? How do normal cells get transformed into cancerous neoplastic cells? Mention the difference between viral oncogenes and cellular oncogenes. |
(ii) Write the major properties of cancer cells. |
(i) Food web and trophic levels are interconnected. Justify. |
(ii) Give diagrammatic representation of trophic levels in an ecosystem with the appropriate diagrams. |
Or |
Detritus gets decomposed step - by - step by different agents and made available as nutrients to the plant. Describe briefly. |
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