NCERT Class 11-Biology: Chapter – 1 the Living World Part 6 (For CBSE, ICSE, IAS, NET, NRA 2023)

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Question 8:

Do you consider a person in coma-living or dead?


People in comas are alive. A coma is caused by many different things, but it all boils down to them not being able to sustain a usable level of consciousness.

The outcome of a coma is varied. Some people decline and die; some people recover completely; others recover their consciousness but end up with disabilities ranging from mild to extreme. A few survive in a persistent vegetative state, which isn՚t quite a coma (they sleep and wake and respond reflexively to their environments) , but doesn՚t give them the ability to respond voluntarily to the things around them.

Coma can lead to death, but it is not death.

The difference between a coma and brain death is that in a coma, some or all of the brain is still functional — getting blood flow, burning oxygen and glucose, repairing itself and sending and receiving signals along the nerves. On the other hand, a brain-dead person doesn՚t have any living brain tissue anymore — their brain has no blood flow, no living cells, no way of repairing itself.

Unlike the person in the coma, we can say for sure that the brain-dead person will never recover. Their heart may beat for some time after brain-death, if they are put on a ventilator; but the information in their brain — their soul, if you like — is gone.

Question 9:

What is the similarity and dissimilarity between “whole moong daal” and “broken moong daal” in terms of respiration and growth? Based on these parameters classify them into living or nonliving?


The similarity and dissimilarity between whole moong daal and broken moong daal is as follows.

Whole Moong Dal and Broken Moong Dal
Whole Moong dalBroken moong dal
(i)The whole seed is intact(i)Seed is broken into pieces
(ii)Seed is capable of carrying out respiration.(ii)Respiration does not take place.
(iii)Under favorable circumstances; the seed will undergo changes and would germinate to produce a new plant(iii)This will never be able to germinate.
(iv)This is a living thing(iv)This is a non-living thing.

Question 10:

Some of the properties of tissues are not the constituents of its cells. Give three examples to support the statement.


It is indeed true some of the properties of tissues are not the constituents of its cells. Following three examples support this statement:

  • A muscle true that some of the properties of tissues are not the constituents of its cells following three examples support this statement:
  • The skeletal. System is composed of bones and cartilage. A bone is hard and lightweight while cartilage is soft. But they possess different constituents.
  • Blood is capable of carrying oxygen but WBCs are not capable of doing in spite of being the constituents of blood.