control and coordination — Science STD 10 — Question

Name two organisms which are now extinct and are studied from their fossils.

Give one reason for not using a series arrangement for domestic circuits.

How do resistance and resistivity of metallic wire depend on temperature ?

Raju focussed the image of a candle flame on a white screen using a convex lens. He noted the position of the candle as 26.0 cm, the position of the convex lens as 50.0 cm and the position of the screen as 74.0 cm. What is the focal length of the convex lens ?

Write down the name of different methods of asexual reproduction.

Which allotrope of carbon is very hard?

Name the scientist who first suggested that a force would act on a current-carrying wire placed in a magnetic field.

What is the mode of nutrition in fungi?

Give the correct sequence of conduction of impulse.

Give the scientific terms used to represent the Growing of a pollen tube towards ovule