PART - 2 - Unit V : CH - 19 Chemical Coordination and Integration — BIOLOGY STD 11 Science — Question

What is it called when nodes are capable of producing activity without any external stimulation?

Through which medium is O₂ and CO₂ transported?

Vinay was going through an industrial area with his grandfather. While on the way, he felt suffocated and dizzy due to the smoke coming out of the factory. Vinay got angry and started shouting that all these factories should be closed. His grandfather calms him down and explained that it is due to large scale cutting of trees for urbanization and industrialization which has disturbed the balance of atmospheric gases. He also explained various economic importance of plants.

1. Large scale cutting of trees leads to ___________________?
2. What initiatives should be taken to maintain the atmospheric balance.
3. Give various economic importance of plants.
4. What values are shown by his grandfather?

Name the leucocytes involved in:

1. Immune response.
2. Allergic reactions.

How would non-secretion of saliva affect the digestion of food in the mouth?

Why digestive tract of flatworms and comes coelenterates is called incomplete?

What was discovered in the sperm of autoclaved herring?

Name the endocrine gland that produces calcitonin and mention the role played by this hormone.

Which cytochrome does not contain Fe?

Name the two types of proteins secreted by fibroblasts.