It is found that photosynthesis starts in certain plants when exposed to the sunlight but it does not start if the plant is exposed only to infrared light. Explain.

What does the term 'luxuriance' stands for the plants breeding? Explain.

What case a green plant exposed to the light on only one side to bend towardsthe sourceof light as it growns?

Vanda uses the host plant only for the support and does not harm it'. Justify the statement.

What are the organelles found only in plant cll.

A wooden block is kept on a polished wooden plank and the inclination of the plank is gradually increased. It is found that the block starts slipping when the plank makes an angle of 18^@ with the horizontal. However, once started the block can continue with uniform speed if the inclination is reduced to 15^@ . Find the coefficients of static and kinetic friction between the block and the plank.

Of the total sunlight, only 2-10% of the solar energy is used by green plants for photosynthesis. Explain why?

In a photodiode,the conductivity increases when the material is exposed to light.It is found that the conductivity changes only if the wavelength is less than 620nm.What is the band gap?

A block of mass 2.5 kg is kept on a rough horizontal surface. It is found that the block does not slide if a horizontal force less than 15 N is applied to it. Also it is found that it takes 5 seconds to slide through the first 10 m if a horizontal force of 15 N is applied and the block is gently pushed to start the motion. Taking g=10 m/s^2 , calculate the coefficient of static and kinetic friction between the block and the surface.

Assertion and Reason. Mark the correct choice as:Assertion:We can see the rainbow in the sky when the rain starts falling after a spell of bright sunlight. Reason: The rainbow is formed due to disprsion of light.