P-1 Carbon Compounds — Science STD 10 — Question

The organ A which is located inside the skull of our body is protected by a bony shell B. It is surrounded by three layers membranes C. The spaces between these layers are filled with a liquid D which protects organ A from mechanical shocks. Organ A in combination with another organ E makes up the central nervous system.

1. What is organ A?
2. What are B, C and D?
3. Name the organ E.
4. While walking barefoot, if we happen to step on a sharp piece of stone, we immediately lift our foot up. Which of the two organs: A or E, is directly involved in this action?
5. If we step out from a darkened room into bright sunlight, we close our eyes for a moment. Which of the two organs: A or E, is directly involved in this action?

Explain the difference between Bayer’s process and Hall’s process by explaining the Bayer’s process.

Write a short note.
Moon missions

Complete the chart - Classification of living organisms

There is a pair of bean-shaped organs P in the human body towards the back, just above the waist. A waste product Q formed by the decomposition of unused proteins in the liver is brought into organ P through blood by an artery R. The numerous tiny filters S present in organ P clean the dirty blood by removing the waste product Q. The clean blood goes into circulation through a vein T. The waste substance Q, other waste salts, and excess water form a yellowish liquid U which goes from organ P into a bag-like structure V through two tubes W. This liquid is then thrown out of the body through a tube X.

1. What is (i) organ P and (ii) waste substance Q?
2. Name (i) artery R, and (ii) vein T.
3. What are tiny filters S known as?
4. Name (i) liquid U, (ii) structure V, (iii) tubes W and (iv) tube X.

Write answer as directed.
What is meant by vinegar and gashol? What are their uses?

What are the various components of blood? State their functions.

What is meant by the 'orbit of a satellite? On what basis and how are the orbits of artificial satellites classified?

Draw a labelled diagram of:

1. A xylem vessel.
2. A sieve tube (or phloem).