Fertilization is a physico-chemical process. Explain.

Adsorption is an exothermic process. Explain.

Internal respiration is called a physico-chemical process.Why?

Enzymes are biocatalysts. They catalyse biochemical reactions. In general they reduce activation energy of reactions. Many physico-chemical processess are enzyme mediate. Some examples of enzyme mediated reactions are given below. Tick the wrong entry:

Long Answer Questions Five mark Each QUESTIONS FROM CBSE BOARD EXAMINATIONS : Fertilization is essential for production of seed, but in some angiosperms seeds develop without fertilization. (i) Give an example of an angiosperm that produces seeds without fertilization. Name the process. (ii) Explain the two ways by which seeds develop without fertilization.

"Ultrafiltration is passive process and secretion is an process." Explain.

Molecular nitrogen is chemically very inert. Explain why?

True or False Fertilization is process of fusion of sperm and ovum.