Q26 of 30 Page 1

How can crop varieties be made disease resistant to overcome food crisis in India? Explain. Name one disease resistant variety in India of:

(a) Wheat to leave and stripe rust


(b) Brassica to white rust


OR


Write the source and the effect on the human body of the following drugs:


(i) Morphine


(ii) Cocaine


(iii) Marijuana


Disease resistant crop varieties are bred by the process of hybridization and selection.

In this process first the screening/finding of disease resistant germplasm is located then it is incorporated in plant cell and hybridization is done. At last selection is done in between the hybridized crop varieties


(a)Himgiri.


(b)Pusa swarnim (Karan rai).


OR


i) Morphine -- It is obtained from latex of poppy plant Papaver somniferum. It acts as a depressant and slows down body function.


ii) Cocaine -- It is a coca alkaloid obtained from coca plant Erythroxylum coca. It interferes with transport of dopamine in the body. It stimulates the Central Nervous System, produces a sense of Euphoria, increased energy, may also cause hallucinations ( in high doses).


iii) Marjuana -- It is a cannabinoid obtained from inflorescence of plant Cannabis sativa i.e. from the flower tops, resins and leaves. They show their effect on the cardiovascular system of the body.


More from this chapter

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24

Identify (A) and (B) illustrations in the following:

(i)


(ii)


(b) write the term given to (A) and (C) and why?


(c) Expand PCR. Mention its importance in biotechnology.


 25


The diagram above is that of a typical biogas plant. Explain the sequence of events occurring in a biogas plant. Identify a, b and c.


 27

Name the type of interaction seen in each of the following examples:

(i) Ascaris worms living in the intestine of human.


(ii) Wasp pollinating fig inflorescence.


(iii) Clown fish living among the tentacles of se-anemone.


(iv) Mycorrhizae living on the roots higher plants.


(v) Orchid growing on a branch of a mango tree.


(vi) Disappearance of smaller barnacles when Balanus dominated in the Coast of Scotland.


 28

(a) Draw a labelled diagram of the human female reproductive system.

(b) Enumerate the events in the ovary of a human female during:


(i) Follicular phase


(ii) Luteal phase of menstrual cycle
OR


(a) Write the specific location and the functions of the following cells in human males:


(i) Leydig cells


(ii) Sertoli cells


(iii) Primary spermatocyte


(b) Explain the role of any two accessory glands in human male reproductive system.