Question

Q.1) Define the following:
2
A) External respiration
B) Neutralization
Q.2) Give Scientific Reasons:
A) Human blood is red coloured.
B) Astronauts on the moon cannot hear each other directly.
Q.3) Distinguish between the following:
A) Manmade material and natural material.​

Answer 1

Answer:

Q1. (A) External respiration - it is the from of term of exchange of gases . It describe both the bulk flow of air into and out of the lungs .

B.Neutralization - it is the reaction between acids and base to produce salt and water.

Q2 (A) Human blood is red in colour due to presence of hamoglobin

(B) Astronauts on the moon cannot hear each other directly because there is no at moon.

Q3 (1) Man made material can be repaired easily by owner of the material .

2) Natural material are obtain from nature .