What is meant by positive , negative and zero work done ? Give an example of each of them .

(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.

Deviation may be positive or negative of zero.

(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 disproportionation of an oxidation state ? Give an example

What is meant by positive work, negative work and zero work ? Illustrate your answer with examples of each type.

What is meant by dispropoertionation of an oxidation state ? Give an example .

What is meant by disproporitonation of an oxidation state? Give an example.

What is meant by positive deviations from Raoult's law ? Give an example. What is the sign of Delta_(mix)H for positive deviation ?

What is meant by positive and negative deviation from Raoult's law ?

What is meant by positive deviations form Raoult's Law ? Give an example. What is the sing of DeltaH_("mixing") for positive ?