Leaves of the sensitive plant move very quickly in response to ‘touch’. How is this stimulus of touch communicated and explain how the movement takes place?

Explain the mechanism of inheritance used by sexually reproducing organisms to ensure the stability of DNA of the species.

Identify from the following the ray diagram which shows the correct path of the reflected ray for the ray incident on a concave mirror as shown:

The water of crystallization is present in:
(i) Bleaching Powder
(ii) Plaster of Paris
(iii) Washing Soda
(iv) Baking Soda

In a bisexual flower the male gametes are present in the :

Write chemical equations to show what happens when an acid reacts with a:
Write chemical equations to show what happens when an acid reacts with a:
(i) Metal
(ii) Base
(iii) Carbonate
Write the name of the main product formed in each case

Give two methods used to grow rose and jasmine plants by vegetative propagation.

Define a precipitation reaction. Give its example and also express the reaction that occurs in the form of a balanced chemical equation.

A tall pea plant with round seeds (TTRR) is crossed with a short pea plant with wrinkled seeds (ttrr). The \( F_1 \) generation will be:

The basic filtration unit of the excretory system in human beings is:

Which one of the following is not an excretory product in plants?

Assertion (A) : In large animals, oxygen can reach different parts of the animal's body easily.
Reason (R) : Respiratory pigments take up oxygen from the air and carry it to body tissues.