Solved MCQs of Biology Class 9
The grater the no. of stomata on leaf , the …………. would be transpiration.
Higher
Lower
Remain constant
None
Which ions are involved in opening and closing of stomata?
Potassium ions
Chloride ions
Sodium ions
Iodide ions
Normal rate of heart beat in a healthy human being is ……… beats per minute.
72
73
70
75