PHYSICS CH5 Magnetism and Electromagnetism — Science STD 9 — Question

There are 3 plants A, B and C. The flowers of A open their petals in bright light during the day but closes when it gets dark at night. On the other hand, the flowers of plant B open their petals at night but closes during the day when there is bright light. The leaves of plant C fold up and droop when touched with fingers or any other solid object.

1. Name the phenomenon shown by the flowers of plant A and B.
2. Name one plant each which behaves like the flowers of plant A and B. 
3. Name the phenomenon exhibited by the leaves of plant C. 
4. Name the plant which behaves like the leaves of plant 'C'?

At an orbital height of 400 km, find the orbital period of the satellite.

1. miscible liquids,
2. immiscible liquids