Reflection of Light — Science STD 10 — Question

Calculate the combined resistance in each case:

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.

X and Y are two human beings. The organ A in the reproductive system of X releases a mature gamete B once a month which goes into a tube-like structure C through a funnel-like opening. The organ D in the reproductive system of Y makes and releases gametes E which pass through a duct F and are introduced by an organ of Y, into the body of X. B and E fuse together in C to form a new cell G. The cell G divides repeatedly to form a ball of cells H which gets embedded in the lining of organ I of reproductive system of X where it grows and develops into a baby.

1. Name (i) organ A, and (ii) gamete B.
2. Write two names of tube-like structure C.
3. Name (i) organ D, and (ii) gamete E.
4. Write two names of duct F.
5. Name (i) cell G (ii) ball of cells H, and (iii) organ I.
6. Out of X and Y, which one is (i) male, and (ii) female?

List two advantages associated with water harvesting at the community level.

Plants do not have any nervous or muscle tissue, still, they have the ability to sense touch. How?

Describe the process of fertilisation in humans and development of embryo briefly.

i. Compare soaps and detergents on the basis of their composition and cleansing action in hard water.
ii. What happens when ethanol is treated with sodium metal? State the behaviour of ethanol in this reaction.
iii. Draw the structure of cyclohexane.
iv. Name the following compound.

Write the names of five endocrine glands found in the human body. Name the hormones secreted by each gland.

Solution A turns universal indicator blue to purple whereas solution B turns universal indicator orange to red.

1. What will be the action of solution A on litmus?
2. What will be action of solution B on litmus?
3. Name any two substances which can give solutions like A.
4. Name any two substances which can give solutions like B.
5. What sort of reaction takes place when solution A reacts with solution B?

Calculate the combined resistance in each case: