Question

Find out the answers of the following:

1. Why does the skin of your fingers shrink when you wash clothes for a long time?

2. Classify the following as osmosis or diffusion:

a. Swelling up of raisins on keeping in water.

b. Fish using oxygen dissolved in water during respiration.

3. How are chromatin, chromatic and chromosomes related to each other?

➢ Each of these questions contains an Assertion followed by reason. Read them carefully

and answer the following questions on the basis of following options. You have to select

the one that best describes the two statements.

a. Assertion is true, Reason is true, Reason is a correct explanation for Assertion.

b. Assertion is true, Reason is true, Reason is Not a correct explanation for

Assertion.

c. Assertion is true, Reason is false.

d. Assertion is false, Reason is true.

1. Assertion: Schleiden and Schwann were the first to put forward cell theory.

Reason: The cells are always living unit.

2. Assertion: Cell wall is present in plant.

Reason: Animal cells lack cell wall.

➢ Read and try to understand Animal Tissues thoroughly.​

Answer 1

Explanation:

1. Soap solution is a hypertonic solution i.e., more concentrate than our skin cells. ... During washing of clothes, exosmosis takes place in the skin cells. This leads to shrinkage of skin over the fingers while washing clothes for a long time.
2. Osmosis occurs in

a.Swelling up of raisins on keeping in water.

Diffusion occurs in

b. Fish using oxygen dissolved in water during respiration.

3. Chromatin fibers are made from coiling of a long polynucleotide strand of DNA to fit into the cell. Chromatin is present as a diffuse network of fine filaments in the non dividing nucleus. At the time of cell division, chromatin material becomes condensed into rod-like structures called as chromosomes. Each chromosome has a centromere and two arms called as chromatids.