P-2 Animal Classification — Science STD 10 — Question

Write a short note.
Dew point temperature

Explain the following terms with example: Alkane.

(Cultural, agriculture, fire, brain, Cro-Magnon, Homo sapiens, Neanderthal)
Evolution of upright man continued in the direction of developing its ………. for the period of about 1 lakh years and meanwhile he discovered the ………. Brain of man, 50 thousand years ago had been sufficiently evolved to the extent that it could be considered as member of the species ………… Neanderthal man can be considered as the first example of wise-man. The ……….. man evolved about 50 thousand years ago and afterwards, this evolution had been faster than the earlier. About 10 thousand years ago, wise-man started to practise the ………. It started to rear the cattle-herds and established the cities. ………..development took place later.

Write down the following activities in the correct order for a simple reflex arc:

1. Impulse travels in the motor fibre.
2. Impulse travels in the sensory fibre.
3. Effector organ stimulated.
4. Impulse crosses the synapse.

With the help of a labelled diagram, explain the construction and working of a solar cooker.

Write in brief about progressive changes in animal classification.

How is nuclear fission reaction carried out in nuclear power plants?

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 shows negative geotropism.

Explain the role of latent heat in the change of state of a substance.

Sketch, labell and classify: Earthworm