P-2 Animal Classification — Science STD 10 — Question

The pH values of five solutions A, B, C, D and E are given below:

1. 1
2. 5
3. 7
4. 11
5. 13

Which solution is:

1. Weakly alkaline.
2. Neutral.
3. Strongly acidic.
4. Strongly alkaline, and.
5. Weakly acidic?

Explain the cleansing action of soap. Draw diagrams to illustrate your answer.

Conventional system of Animal classification.

Name two common sexual diseases. What are their symptoms?

What is a plant hormone? Name four plant hormones. State one function of each.

How are threatened species classified? ### What are the different types of threatened species?

How will you justify that overcoming the pollution is a powerful way of environmental management?###Why is it said that pollution control is important?

The human males use a device X made of a very thin rubber sheet as a covering on the male organ to prevent pregnancy. This device traps the gametes Y in it. In order to prevent pregnancy, the human females use a device Z which is a circle of rubber with a metal spring around it. The device Z is put inside the vagina to cover the cervix. It stops Y from going into the uterus.

1. What is device X?
2. What are Y?
3. Name the device Z.
4. What is the general name of these methods of birth control (or preventing pregnancy)?
5. The use of which contraceptive device, X or Z, can protect the persons from sexually transmitted diseases?

State the functions of the following hormones:

1. Thyroxine.
2. Adrenaline.
3. Growth hormone.