Q2 of 43 Page 1

How are the members of genus Glomus useful to organic farmers?

Glomus forms Mycorrhiza. Mycorrhiza is the symbiotic association of fungi with roots of plants. The fungal symbiont absorbs phosphorous from the soil and makes it available to the plant.


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24

Strict instructions were given to students going on a school trip to Ladakh that they are expected to stay indoors for the first two days of the trip. Why were such instructions given? Explain.

 26

(a) Explain the process of transcription in a prokaryote.

(b) List only, the two additional complexities observed in the process of transcription in eukaryotes.


OR


(a) Why did T.H. Morgan select Drosophila melanogaster as a specimen for his experiments?


(b) Morgan, in his dihybrid crosses with Drosophila observed deviations in the phenotypic ratio of F2 progeny in comparison to that of Mendel. With the help of a suitable example, explain how his results deviated from that of Mendel.


 6

Humans are categorised as ‘‘regulators’’. Explain how they maintain a constant normal body temperature.

 8

Scientists are trying to solve the issues of malnutrition and hunger by using microbes. By taking one suitable example, explain how they have been able to help.