Q. In plants, exchange of gases takes place through

1. Stomata
2. Mid-rib
3. Palisade tissue
4. Spongy tissue

Q. What is greenhouse effect?

Q. Describe the structure of mitochondria with the help of a diagram.

Q. Mention various diseases caused by the deficiency of vitamin 'A'.

Q. Draw the structure of an ovule and label its parts.

Q. What are the duties of anganwadi workers?

Q. Conversion of glucose to pyruvic acid yields a net gain of

1. $36$ molecules of ATP
2. $2$ molecules of ATP
3. $4$ molecules of ATP
4. $38$ molecules of ATP

Q. What is a reaction centre?

Q. Shedding of leaves and fruits is due to the hormone

1. Ethylene
2. NAA
3. ABA
4. GA

Q. What is the difference between efferent nerves and afferent nerves?

Q. What are Nissel granules? Where do you find them?

Q. What are the end products of light reactions?

Q. What is iodised salt? Why is it advisable to take iodised salt?

Q. Mention the symptoms of a fracture.

Q. The outer membrane that covers brain is:

1. Myelin Sheath
2. Dura mater
3. Arachnoid membrane
4. Pia mater

Q. What is Totipotency?

Q. Draw a neat labelled diagram of lungs in man.

Q. How is sinus venosus formed in Amphibia?

Q. What are the advantages of vegetative propagation?

Q. Bring out the differences between right auricle and left auricle.

Q. What is apical dominance?

Q. Why do sports persons take glucose?

Q. The enzyme present in HIV is

1. Integrase
2. Reverse transcriptase
3. Protease
4. All of the above

Q. What is the chemical name of the niacin? Why is it required to the body?

Q. What is the role of gibberellins in plant growth and development?

Q. Describe the structure of cerebrum.

Q. What are the functions of spinal cord?

Q. What is corpus luteum and what is its function?

Q. A person initially infected with HIV reaches the AIDS stage. What are the different stages he passes through?

Q. The spawn of frog consists of

1. Ova
2. Spermatozoa
3. Sperm mother cells
4. Ova and Spermatozoa