Q4 of 42 Page 1

In what way is monocyte a cellular barrier with reference to immunity ?

Monocytes are phagocytic in nature. They destroy foreign bodies entering in the human body, thereby providing innate immunity to foreign organisms and hence act as a cellular barrier in humans.


*Innate immunity: immunity present from birth and is inherited from parents.


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26

Mention the site of fertilization of a human ovum. List the events that follow in sequence until the implantation of the blastocyst.

OR


(a) Draw a diagram of a fertilized embryo sac of a dicot flower. Label all its cellular components.


(b) Explain the development of a mature embryo from this embryo sac.


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Why is RNA more reactive in comparison to DNA?

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Explain with the help of an example the type of evolution homology is based on.

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Why do people suffer from altitude sickness after reaching the high altitude regions ? How does their body acclimatized after a couple of days ?