Samya visited a zoo with her mother on watching the cheetah she wondered how he uses his forelimbs for running.While the same forelimbs in bats are used for flying.she want to know about it ask her mother about it.Her mother explains different animal groups for different functions.
(i)What are such organs called?
(ii)Give an example of such organs from the plant world
(iii)What led to the origin of such organs?
(iv)What are the values shown by samya?

Doctor are worried about antibiotics resistance in disease causing bacteria such as Mycobacterium and are using DNA fingerprinting technique for screening of resistance bacteria.
Read the above passage and answer the following questions:
(i) What is antibiotics?
(ii) What are the possible reasons for development of resistance in bacteria to antibiotics?
(iii) How can DNA fingerprinting be helpful in controlling growth of such bacteria?

Ramu was spraying white powder in the street near the stagnant water. Anil enquired about this substance and Ramu told him that it was DDT powder which is used to kill mosquitoes. He further said that earlier this powder was very effective in controlling mosquitoes growth but now it is not so effective.
Read the above passage and answer the following questions:
(i) What is the possible reason for ineffectiveness of DDT led to the development of resistance in the mosquitoes.
(ii) What message would you like to give to the society?

One day, while returning home from school, Anil saw a crowd gathering front of Mr. Sharma's house. He asked his mother about it. She told that Mrs. Sharma gave birth to a child with small tail. Many people gathered just for curiosity and some whispered that it is a bad omen.
Read the above passage and answer the following questions:
(i) What is your opinion about child?
(ii) What is atavism?
(iii) What will be your role as a good citizen and student of biology?

One day, father complained of severe pain in the abdomen. Naresh took him to doctor for examination. Doctor diagnosed it to be a case appendicitis and advised immediate surgical removal of vermiform appendix.
Read the above passage and answer the following questions:
(i) What is appendicitis?
(ii) What is vermiform appendix?
(iii) What value was displayed by Naresh?