Question

1.
Which of the following reactions is an exothermic reaction?

(a) Respiration
(b) Heating of ferrous sulphate crystals
(c) Electrolysis of water
(d) Decomposition of silver bromide

4.
Which one of the following is an artificial ecosystem?

(a) Pond
(b) Crop Field
(c) Lake
(d) Forest

Answer 1

1. Respiration is an exothermic reaction.

2. Crop field is an artificial ecosystem because it is made and maintained by Human.

Answer 2

Respiration is an exothermic reaction