What is the stimulus in: (a) phototropism? (b) geotropism? (c) chemotropism? (d) hydrotropism? (e) thigmotropism?

Write one example each of the following tropic movements? i) Positive phototropism ii) Negative phototropism iii) Positive geotropism iv) Negative geotropism v) Hydrotrpopism vi) Chemotropism

Johnson (1829) discovered (a) Hydrotropism (b) Phototropism (c) Geotropism (d) Photonasty

Motion of sperm is (a) Chemotaxis (b) Rheotaxis (c) Hydrotropism (d) Random

The growth of a pollen tube towards the ovule is caused by A) phototropism B) hydrotropism C) geotropism D) chemotropism

The movement of pollen tube is called (a) Chemotropism (b) Thermotaxis (c) Thermonastic (d) Hydrotropism

Most of the plants are seasonal due to (a) Photoperiodism (b) Phototropism (c) Photosynthesis (d) Photolysis

Differentiate between Phototropism and geotropism

(a) What is meant by positive tropism and negative tropism? Explain with examples. (b) Define thigmotropism. Give one example of thigmotropism. (c) What is the difference between thigmotropism and thigmonasty? Name one plant which exhibits thigmotropism and one plant which exhibits thigmonasty. What behaviour (or responses) of these plants make you think that they exhibit thigmotropism and thigmonasty respectively?

Define the following : (a) Reflex action (b) Synapse (c ) Phototropism.