72. The power of a concave lens is positive. [True/False]
72. The power of a concave lens is positive. [True/False]

What type of questions asked from the lesson of magnetic effect of electric current
Last Activity: 2 Months ago

Wavelength of green light is
A) 400-450 nm
B) 500-550 nm
C) 660-720 nm
D) 720-800 nm
Last Activity: 4 Months ago

What is the difference between anaerobic & aerobic respiration? Name some organism that uses the aerobic mode of respiration?
Last Activity: 4 Months ago

What are the main components of our environment? Explain each of them briefly.
Last Activity: 4 Months ago

What are examples of hydrotropism plants?
Last Activity: 4 Months ago