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

(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.

The root of a plant is: (i) positively phototropic but negatively geotropic (ii) positively geotropic but negatively phototropic (iii) negatively phototropic but positively hydrotropic (iv) negatively hydrotropic but positively phototropic

Control And Coordination In Plants |Plants Movement - Nastic Movements|Tropic Movements|Photo And Geotropism |Hydro And Chemotropism|Thigmotropism|One Shot Revision

(a) Define geotropism. Give one example of geotropism. (b) What is meant by 'positive geotropism' and negative geotropism? Give one example of each type. Draw a labelled diagram to illustrate your answer indicating the plant part which shows positive geotropism and the plant part which shown negative geotropism. (c) Name one plant part which exhibits positive thigmotropism.

(a) What is (i) phototropism and (ii) geotropism? Given that activity supported by labelled diagrams to show that light and gravity affect the direction of plant growth. (b) Mention the role of the following plant hormones. (i) Auxin (ii) Abscisic acid

A plotted plant is growing in a transparent glass jar. In this plant, X and Y are the two growing parts having a lot of meristematic tissue. It is observed that the part X of this plant exhibits positive geotropism but negative phototropism. On the other hand, part Y of this plant exhibits negative geotropism but positive phototropism. (a) Name the part X of plant. (b) Name the part Y of plant. (c) Which part of the plant, X or Y, will exhibit positive hydrotropism? (d) Which part of the plant, X or Y, can have tendrils on it? (e) Which phytochormone causes the part X to exhibit negative phototropism?

(a) Define phototropism. Give one example of phototropism. (b) How does phototropism occur in a plant stem (or shoot)? Explain with the help of labelled diagrams. (c) What is meant by positive phototropism and negative phototropism? Give one example of each type.

What is meant by (a) threshold stimulus, (b) muscle twitch, and (c ) tetanus.