Discuss and give your answer. You know that plant produce their food by a process called photosynthesis. Can we cll photosynthesis a chemical change?

When food gets spoiled , it produces a foul smell. Shall we call this change as a chemical change?

Photosynthesis is a chemical change. Justify your answer.

Arrange the following statements in correct sequence. 1.Plants manufacture food by a process called photosynthesis. 2.Plants require energy for their growth. 3.Plants take carbon-di-oxide from the atmosphere, use chlorophyll in the presence of sunlight and prepare food. 4.Plants take in oxygen and release carbon-di-oxide just as animals. 5.Such oxygen is available to animals and human beings for breathing. 6.During this process, oxygen is released by plants.

The given graphs shows the productivity of an aquatic ecosystem measured in terms of dissolved oxygen produced and consumed by green plants and photosynthetic algae where PS=photosynthesis and R=respiration. What will happen during algal bloom? 1. PS will be increase, R will be decreased 2. PS will be decreased, R will be increased. 3. PS and R will not change. 4. PS+R will increase.

A plant in your garden avoids photorespiratory losses , has improved water use efficiency , shows high rates of photosynthesis at hifh temperatures and has improved efficiency of nitrogen utilisation . In which of the following physiological groups would you assign this plant?

True or False - If False give the correct answer : If the chemical properties of a substance remain unchanged and the appearance or shape of a substance changes it is called a periodic change.

Assertion (A): Autotrophic components manufacture food from simple inorganic susbstance. Reason (R) : Autotrophs create enere through a process called photosynthesis.

Read the following paragraph carefully and answer the following: Tie a stone to one end of a string. Take the other end in your hand and rotate the string so that the stone moves along a circle. As long as we are holding the string, we are pulling the stone towards us i.e. towards the centre of the circle and are appliying a force towards it. The force stops acting on it if we release the string. In this case, the stone will fly off along a straight line which is the tangent to the circle at the position of the stone when the string is released, because that the directionn of its velocity at that instant of time. You may recall a similar activity in which a 5 rupee coin kept on a rotating circular disc flies off the disc along the tangent to the disc. Thus, a force acts on any object moving along a circle and it is directed towards the centre of the circle. This is called the Centripetal force. The impressed force on the same is in which direction?