Fill in the blanks in the following sentences: (a). Acids have a ______taste and they turn_____litmus to _____ (b). Substances do not show their acidic properties without_____ (c). Acids produce______ions on dissolving in water. (d). Those substances whose smell (or odour) changes in acidic or basic solution are called _______indicators. (e). Onion and vanilla extract are_____indicators.

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?