life processes — Science STD 10 — Question

Choose one correct options from those given below each question:
Which of the following reactions are correct?

State different forms of energy required for breaking down the molecules of reactant in decomposition reaction.

Why do acids not show acidic behaviour in the absence of water?

About which organism there is a controversy regarding whether it is a living being or non-living entity?

Name the elements which have the smallest and the largest atoms.

What kind of mirror-concave, convex or plain-would be best suited for use in a solar cooker? Why?

Give an example of antioxidant.

Find mismatched pair :
1. One cell thick - blood capillary
2. Ring of cartilage - trachea
3. Phloem tissue - transport of sucrose
4. Platelet cells - transport of respiratory gases

What is the principle of an electric motor?

What is the response of stem to light? What is this phenomenon known as?