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

What is a dihybrid cross? How did Mendel perform this cross?

State Mendel’s law of Independent Assortment.

A homozygous Tall plant (T) bearing red coloured (R) flowers is crossed with a homozygous dwarf plant (t) bearing white flowers (r):
(1) Give the Genotype and Phenotype of the F₂ generation.
(2) Give the possible combinations of the gametes that can be obtained from the F₂ hybrid.
(3) Give the dihybrid ratio and the phenotype of the offsprings of the F₂ generation when two plants of the F₁ generation above are crossed.

Give Technical Term:

The ratio of offspring on F2 generation in a dihybrid cross.

How is root hair structurally adapted for absorption of water from the soil?

Root hairs become flaccid, when fertilizers are added to the moist soil around it. Explain.

What is toxicity ?

Grapes shrink when immersed in a very strong sugar solution.” Explain.

Complete the following sentence with appropriate word:

_______ is the ratio of dihybrid cross.

Complete the following sentence with appropriate word:

A character that is suppressed is _________.

A few RBC’s were kept in three test tubes containing isotonic, hypotonic and hypertonic solutions. What will be the expected observations after a few hours? Explain.

Multiple Choice Question

When two individuals differing in at least one character are crossed, the process is known as:

Differentiate between the following
Permeable and Semi-permeable membrane.

The alongside diagram A shows a root hair growing through the soil particles. Diagram B is the root hair of an aquatic plant.

(i) Name the parts 1,2,3.
(ii) Name two substances which enter the root hair. What are their uses?
(iii) By what process do these substances enter the root hair?
(iv) Account for the different shapes of root hairs in the two diagrams.

Given below is the diagram of a cell as seen under the microscope after having been placed in a solution:

(i) What is the technical term used for the state/condition of the cell given above?
(ii) Give the technical term for the solution in which the cell was placed.
(iii) Name the parts numbered 1 to 4.
(iv) Is the cell given above a plant cell or an animal cell ? Give two reasons in support of your answer as evident from the diagram.
(v) What would you do to bring this cell back to its original condition?

Draw a cross-section of root showing association of soil particles with root hairs.

Draw a diagram of the root hair cell as it would appear when a concentrated solution of fertilizers is added near it.

The figure given below is a diagrammatic representation of a part of the cross-section of the root in the root hair zone. Study the same and then answer the questions that follow :

(i) Name the parts indicated by guidelines ‘1’ to ‘5’
(ii) Is the root hair cell unicellular or multi-cellular?
(iii) Draw a labeled diagram of the root hair cell as it would appear if some fertilizer is added to the soil close to it.
(iv) Name the process responsible for the entry of water molecules from the soil into A1 and then A2.
(v) What pressure is responsible for the movement of water in the direction indicated by arrows?
(vi) How is this pressure set up?

The below figure shows a root hair:

(i) Label the parts 1 to 4.
(ii) What is the role of part 4?
(iii) Why is the root hair one-celled?
(iv) What will happen to the root hair if some fertilizer is added to the soil near the root hair?

The diagram given below represents the result of an experiment conducted on two freshly taken shoots of a green herbaceous plant. The lower ends dip in the water.

(i) What is the aim of the experiment?
(ii) Some parts of the stem in both the shoots have been removed. Name the conducting tissue in shoot A and in shoot B, that has been removed.
(iii) What are the results of this experiment?