Ecosystem and Its Components MCQs

Q1. What is the function of growth hormone?

• A.Regulates carbohydrate, protein and fat metabolism
• B.Regulates growth and development of the body
• C.Regulates blood sugar levels
• D.Stimulates the pituitary gland to release hormones

Answer: B. Regulates growth and development of the body

Which principle settles this? As its name indicates, growth hormone regulates growth and development of the body. And the rest? option A) 'Regulates carbohydrate, protein and fat metabolism' fails since This is the function of thyroxin hormone, not growth hormone; option C) 'Regulates blood sugar levels' is incorrect: This is the function of insulin, not growth hormone. Pick: B) Regulates growth and development of the body.

Q2. What is the colour of copper sulphate after heating?

• A.Blue
• B.Black
• C.White
• D.Red

Answer: C. White

NCERT idea this hinges on: When copper sulphate is heated, its water molecules evaporate, resulting in a white colour. Applying this to the choices: When copper sulphate is heated, the water molecules in it evaporate leaving behind white copper sulphate. Eliminating the rest: option A) 'Blue' is incorrect: The colour of copper sulphate is initially blue, but it turns white after heating due to removal of water of crystallization; option B) 'Black' fails since Copper sulphate does not turn black after heating; option D) 'Red' fails since Copper sulphate is not associated with a red colour. Therefore the correct option is C) White.

Q3. What is the electronic configuration (shell distribution) of a chlorine atom (atomic number 17)?

• A.2, 8, 7
• B.2, 8, 8
• C.2, 7
• D.2, 8, 8, 1

Answer: A. 2, 8, 7