Sunny was rushed to a nearby hospital after an accident, which had caused too much blood loss. The hospital failed to supply O negative blood for transfusion. Ahmed, who was attending a patient there, heard about the situation and agreed to donate blood as he had the same blood group. Sunny's mother initially refused but was later convinced by her daughter's view.
(i) Why can't O positive blood be transfused into Sunny's body?
(ii) Human blood grouping is an example of?
(iii) What values do you find in Sunny's sister and Ahmed?

Priya's aunt gave birth to a child with cleft palate. Being a student of biology, Priya was curious to know the reason for this abnormality. So, she discussed this matter with her biology teacher. Teacher explained to her that it is a genetic disorder which is due to the defect in one of the chromosomes of the child.
(i) What are genetic disorders?
(ii) What are the possible causes of genetic disorders?
(iii) As a student of biology, how would you create awareness in society about these disorders?

Anil got selected in Indian Forest Service examination and was asked to appear before medical board to check his medical fitness for this service.On examination, doctor found him suffering from colour blindness.Knowing this, he consulted his family doctor to know about the reason when none of his family members was so. Doctor explained that it is due to sex linked inheritance.
(i) What is colour blindness?
(ii) What is sex linked inheritance?
(iii) As a student of biology, what would you suggest to Anil so that his children are not colour blind?

One day, while remembering about earlier time, Monu's grandfather told him that the country has made tremendous progress in the field of food grain production after green revolution. He further told that earlier we used to import wheat from other countries to feed the huge population.
(i) What is green revolution?
(ii) How was it achieved?
(iii) What value is displayed by grandfather?

Sonu was very fond of gardening. He used to bring seeds of the flowers he liked from different places. Many times, he observed that all plants obtained from seeds were not similar. He discussed the observations with his biology teacher who explained that this is due to phenomenon of crossing over.
(i) What is crossing over?
(ii) What is the significance of cross over?
(iii) How can crossing over be used for commercial purposes?
(iv) What value is displayed by teacher?