Q19 of 43 Page 1

(a) What is the breeding of crops for enhancing their nutritional value called? Why is the need felt for enhancing the nutritional value of the crops?

(b) Rice, wheat and maize are the most commonly used food grains the world over. How have these grains improved in their nutritional value in comparison to their conventional varieties?


OR


(a) Write the scientific names of the source plants from where opioids and canabinoids are extracted.


(b) Write their receptor sites in the human body. How do these drugs affect the human beings?


(A)Breeding of crops for enhancing their nutritional value are called as Biofortification.It makes plant more nutritious while growing up. Hence, there would be no need to add more nutrients into the processed food.


(B) In these grains additional vitamins and minerals are added by the process of Biofortification,this process has increased the nutritional value of the conventional crops to many folds.


OR


a)Opioids : These are obtained from Papaver Somniferum .


Canabinoids : These are obtained from Cannabaceae.


b)



More from this chapter

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17

A woman with ‘O blood group’ marries a man with ‘AB blood group’. Work out the cross to show all the possible phenotypes and genotypes of the progeny with respect to blood groups. Explain the pattern of inheritance observed in this cross.

 18

Hershey and Chase carried out their experiment under three steps: (a) Infection, (b) Blending, and (c) Centrifugation. Explain each one of these steps that helped them to prove that DNA is the hereditary material.

OR


(a) Why does DNA replication occur within a replication fork and not in its entire length simultaneously?


(b) ‘‘DNA replication is continuous and discontinuous on the two strands within the replication fork.’’ Give reasons.


 20

Restriction endonucleases have played a very significant role in rDNA technology. Explain the roles of EcoRI and DNA ligase in formation of recombinant DNA.

 21

Why DNA cannot pass through the cell membrane? How can the bacteria be made competent to take up a plasmid? Explain a method for introduction of alien DNA into a plant host cell. Name a pathogen that is used as a disarmed vector.