(a) How does control and coordination take place in plants? How does it differ from that in animals?
(b) Name five stimuli which act on plants. Name the type of tropism produced by each one of these stimuli.
(c) Define hydrotropism. Give one example of hydrotropism. State whether this example is of positive hydrotropism or negative hydrotropism, illustrate your answer with the help of labelled diagram.

(a) How is sound produced? Explain with the help of an example. (b) How does sound from a sound producing body travel through air to reach our ears? Illustrate your answer with the help of a labelled diagram.

Give one example each of a plant part: (a) which is positively hydrotropic as well as positively geotropic (b) which is positively phototropic but negatively geotropic.

(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.

(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 meant by 'tropisms' (or tropic movements)? Explain with an example. (b) What are the different types of tropisms? Define each type of tropism. Write the name of stimulus in each case. (c) How do tropisms differ from nasties (or nastic movements)?

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) 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?

Give one example each in which a force does (a) positive work (b) negative work and (c ) zero work.