Question 6 :
Take three test-tubes. Fill $\frac {3}{4}th$ of each with water. Label them A, B and C. Keep a snail in test-tube A, a water plant in test-tube B and in C, keep snail and plant both. Which test-tube would have the highest concentration of $CO_2$ ?
Question 8 :
State whether true or false. Plants carry out photosynthesis only during the day and respiration only at night.
Question 9 :
State whether true or false. Frogs breathe through their skins as well as their lungs.
Question 11 :
State whether true or false. The fish has lungs for respiration.
Question 13 :
As a result of the improvement of blood circulation the supply of oxygen to the muscle cells _____.
Question 15 :
Small openings on the sides of the body of an insect is called ?
Question 16 :
Plants carry out photosynthesis only during the day and respiration only at night.
Question 18 :
When we inhale air, it passes through our nostrils into the _________. From the nasal cavity, the air reaches our _____ through the windpipe.
Question 19 :
Normal range of breathing rate per minute in an average adult person at rest is:
Question 21 :
During heavy exercise, we get cramps in the legs due to the accumulation of
Question 26 :
Why do we often sneeze when we inhale a lot of dust-laden air?
Question 27 :
In the presence of oxygen, Glucose $-->$ _______+ water + energy
Question 28 :
During heavy exercise the breathing rate of a person slows down
Question 29 :
In human body muscle, in the absence of oxygen,Glucose --> _________+ energy
Question 35 :
Why does an athlete breathe faster and deeper than usual after finishing the race?
Question 46 :
State whether true or false. During heavy exercise the breathing rate of a person slows down.
Question 48 :
$In the absence of oxygen, Glucose --> _______+ carbon dioxide + energy
Question 49 :
Insects have a network of air tubes called ______ for gas exchange.
