Explain the roles of the following with the help of an example each in recombinant DNA technology:
(a) Restriction Enzymes
(b) Plasmids
Medically it is advised to all young mothers that breastfeedings is the best for their newborn babies. Do you agree? Give reasons in support of your answer.
Draw a diagram of a mature human sperm. Label any three parts and write their functions.
(1) Acrosome: It is a cap-like structure, filled with hydrolytic enzymes that help fertilisation of the ovum.
(2) Middle piece: Possesses numerous mitochondria, which produces energy for the movement of tail.
(3) Tail: Facilitate sperm motility essential for fertilisation.
Looking at the deteriorating air quality because of air pollution in many cities of the country, the citizens are very much worried and concerned about their health. The doctors have declared a health emergency in the cities where the air quality is very severely poor.
(a) Mention any two major causes of air pollution.
(b) Write the two harmful effects of air pollution on plants and humans.
(c) As a captain of your school Eco-club, suggest any two programmes you would plan to organise in the school so as to bring awareness among the students on how to check air pollution in and around the school