Question

Give reasons for the following statements.
1. Plants are autotrophs.
2. Carbon dioxide is necessary for photosynthesis.
3. Leaves are reduced to spines in desert plants like cacti.
4. Photosynthesis purifies atmosphere.​

Answer 1

3.because to reduce loss of water by transpiration

Answer 2

Answer:

because it has a ability to make food by his own, yes it is helpful for make food break during photosynthesis, no it does not do , photosynthesis is the process of plant food not purification atmosphere