Fill the following observation table for given activity: Activity: Iron nail dipped in copper sulphate solution for about half an hour Observation Table : Sr. No. Experiment procedure Observations 1. Colour of CuSO4 soln. before the experiment. 2. Colour of iron nail before the experiment. 3. Colour of CuSO4 soln. after the experiment. 4. Colour of iron nail after the experiment.

What type of questions asked from the lesson of magnetic effect of electric current 

Wavelength of green light is

A) 400-450 nm

B) 500-550 nm

C) 660-720 nm

D) 720-800 nm

What is the difference between anaerobic & aerobic respiration? Name some organism that uses the aerobic mode of respiration?

What are the main components of our environment? Explain each of them briefly.

What are examples of hydrotropism plants?