P-2 Environmental management — Science STD 10 — Question

What is the exact difference between grades of organization and symmetry. Explain with examples.

When a person puts food in his mouth, then teeth cut it into small pieces, chew and grind it. The glands A in the mouth secrete a substance B which is mixed with the food by tongue. The substance B contains an enzyme C which starts the digestion of food in the mouth. The slightly digested food from the mouth goes down a tube D. The special type of movements E in the walls of tube D push the food into stomach for further digestion. The stomach wall secretes gastric juice containing three substance F, G and H. One of the functions of F is to kill bacteria which may enter the stomach with food. The substance G protects the inside layer of stomach from the damaging effect of substance F whereas substance H is and enzyme for digestion. The partially digested food then enters into small intestine for further digestion.

1. What is Gland A, Substance B and Enzyme C?
2. Name the tube D.
3. What is the movement E known as?
4. What are F, G and H?

Assign names in the figure given below. Explain the various stages those are kept blank:

Write short notes: Biodiversity.

Which factors affect the social health?

Give the various functions of brain.

Gender of child is determined by the male? partner of couple. Explain with reasons whether this statement is true or false.###“A couple shall have a male child or female child totally depends upon husband”. Prove truthfulness of this statement with scientific reason.

Write short note :
Inner-Transition Elements.