Electricity — Science STD 10 — Question

When a light ray passes obliquely through the atmosphere in an upward direction how does its path generally change?

Give an example of chemotropic movement.

Suggest a few useful ways of utilising waste water.

At which point information is acquired in the neuron?

Explain why, a human zygote is more likely to grow into an adult than a frog zygote.

Describe an activity to show that while paper is biodegradable but plastic (say, polythene) is non-biodegradable.

State two advantages of geothermal energy.

If you walk from a dark room into sunlight and back again into dark room, how would your pupils alter in size? What makes this happen?

What is the importance of DNA copying in reproduction? Explain with an example.

InMendele′ ev’s Periodic Table the elements were arranged in the increasing order of their atomic masses. However, cobalt with atomic mass of 58.93amu was placed before nickel having an atomic mass of 58.71amu. Give reason for the same.