(English Medium) ICSE Class 10 - CISCE Question Bank Solutions for Biology

What are genes? 

Given below is a schematic diagram of a portion of DNA.

1. How many strands are shown in the diagram?
2. How many nucleotides have been shown in each strand?
3. Name the parts numbered 1, 2, 3, 4 and 5 respectively.
4. Name the DNA unit constituted by the parts 1, 2, 3 collectively.

Choose the best option out of the four alternatives a, b, c and d 

Question 1:
The number of chromosomes in a certain type of cell division is halved. This kind of cell
division occurs in.
(a) Only testis
(b) Only ovary
(c) Both ovary and testis
(d) All body cells

Match the events given in column A with the phase in mitotic cell division in column B. 

Humans have 46 chromosomes. Their sperms and eggs will have ______ chromosomes each.

Fill in the blank 

The _______ (s) are surrounded by radiating rays called aster

State the difference between: 

Chromosome and chromatid:

Transpiration is the loss of water as water ______ from the ______ parts of the plant.

(a) State whether the following statement are True or False.

(b) Rewrite the false statement in the correct form by changing either the first or the last word only.

Most transpiration occurs at midnight.

Give suitable explanation for the following:

Cork and bark of trees help in preventing loss of water

Give suitable explanation for the following: 

Perspiration and transpiration help to cool the body temperature of the organism. 

Give suitable explanation for the following: 

On a bright sunny day, the leaves of certain plants roll up.

Given below is a diagrammatic sketch (surface view) of a stomatal apparatus from a dicot leaf.

(a) Label the parts numbers 1-3
(b) Is this state, open or closed?
(c) Is this stoma, of a dicot leaf or a monocot leaf?
(d) Redraw a sketch of the stomatal apparatus in the state opposite to the one shown here. 

Given alongside is the diagram of an experimental set-up to demonstrate a certain phenomenon in plants.

Name the phenomenon being demonstrated.

During the pairing of chromosomes in meiosis, the ________ chromosomes come to lie side by side.

“First meiotic division is the reduction division” what does the word ‘reduction’ refer to in this statement? 

Mention whether the following statement is (T) Or (F). Give reason in support of your answer. 

The unfertilized human egg has half the number of chromosomes of the body cells. 

In humans, urea is formed in

Name the following: 

The outer region of kidney containing the Bowman's capsule.

Name the following: 

The tuft of capillaries inside the Bowman's capsule.