P-2 Animal Classification — Science STD 10 — Question

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

Sketch, label and classify the following organisms: Cockroach:

Have you seen a photographic camera in which a film is used? Compare the human eye with it. State similarities between them. State the points of difference between them.

How do we decide that a given material is a good conductor of electricity or is an insulator?

What is the stimulus in:

1. Phototropism?
2. Geotropism?
3. Chemotropism?
4. Hydrotropism?
5. Thigmotropism?

There are two similar glands P which are located on top of two similar organs Q in the human body. P are often called the emergency glands and they secrete a hormone R into the blood stream. R is secreted in large amounts when a person is frightened. It brings about temporary changes in the body which allow a lot of substance S from the liver to go into the blood to provide a lot of energy in a very short time. This helps a person to fight back or run away from the frightening situation.
What are P, Q, R and S?

Give scientific Reason :
Atomic number is a more fundamental property of an element than its atomic mass.

The mass and weight of an object on earth are 5 kg and 49 N respectively. What will be their values on the moon? Assume that the acceleration due to gravity on the moon is 1/6th of that on the earth

An element E exists in three allotropic forms A, B and C. In allotrope A, the atoms of element E are joined to form spherical molecules. In allotrope B, each atom of element E is surrounded by three other E atoms to form a sheet like structure. In allotrope C, each atom of element E is surrounded by four other E atoms to form a rigid structure.

1. Name the element E.
2. What is allotrope A.
3. What is allotrope B?
4. What is allotrope C?
5. Which allotrope is used in making jewellery?
6. Which allotrope is used in making anode of a dry cell?