Question

Q:- DEFINE TROPISM. EXPLAIN FOUR KINDS OF TROPISMS WITH ONE EXAMPLE EACH. ​

Answer 1

Answer:

Tropism, response or orientation of a plant or certain lower animals to a stimulus that acts with greater intensity from one direction than another. It may be achieved by active movement or by structural alteration. Forms of tropism include phototropism (response to light), geotropism (response to gravity), chemotropism (response to particular substances), hydrotropism (response to water), thigmotropism (response to mechanical stimulation), traumatotropism (response to wound lesion), and galvanotropism, or electrotropism (response to electric current). Most tropic movements are orthotropic; i.e., they are directed toward the source of the stimulus. Plagiotropic movements are oblique to the direction of stimulus. Diatropic movements are at right angles to the direction of stimulus.

Answer 2

Explanation:

Define tropism. Explain four kinds of tropisms with one example each:

Tropism refers to a biological phenomenon, indicating growth or turning movement of a biological organism, usually a plant, in response to an environmental stimulus.

Types of Tropism:

: It is the movement of plant in response to light.Ex:In plants shoots respond to light by bending towards light.

• Chemotropism:It is the movement of plant in response to chemical. Ex:The growth of pollen tubes towards ovules.
• Geotropism: It is the movement of plant in response to the gravity. Ex:The roots of the plants always grows downwards whereas the shoots of the plant always grows upwards.
• Hydrotropism: It is the movement of plant in response to the water. Ex:The roots of the plants grow in the direction of the place where water is available.