State any three differences between nastic and tropic movements.

Characteristics Nastic movement Tropic movement Definition Plant organs having bilateral symmetry, such as leaves and stomata, exhibit nastic movements. The nastic movement stimulus might be unidirectional or diffused. Plant organs having radial symmetry, such as the root and stem, exhibit trophic movements. The stimuli for trophic movements are unidirectional and are never diffused. Characteristics Nastic movement Tropic movement Movement The nastic movements are induced by changes in the turgor pressure of the organ's cells. Tropic movements are induced by the organ's cell divisions. Characteristics Nastic movement Tropic movement Example Touch-induced drooping of Mimosa pudica leaves (Thigmonastic movement). Movement of the shoot in the direction of the sun (phototrophic movement).

Answer the following short answer-type question: Draw the structure of a neuron and label the following on it: ( a ) Dendrite ( b ) Axon

The neural system of all animals is composed of highly specialised cells called neurons which can detect, receive and transmit different kinds of stimuli. A neuron is a microscopic structure composed of three major parts, namely, cell body, dendrites and axon.