The Fundamental Unit of Life — Science STD 9 — Question

Define the terms and give one example: Triploblastic.

A student placed a gas jar containing air in the upside down position over a gas jar full of red-brown bromine vapours. He observed that the red brown colour spread upwards into the jar containing air. Based on this observation, the student concluded that it is only the bromine vapour which moves up and diffuses into air in the upper jar, the air from the upper jar does not move down by diffusion into the lower jar containing bromine vapours. Do you agree with this conclusion of the student? Give reason for your answer.

Will they help in curing Preeti’s disease? Why?

Animals of colder regions and fishes of cold water have thicker layer of subcutaneous fat. Describe why?

State the definition of health given by WHO. Write down the traits of a healthy person.

Identify the following fishes:

1. Fish with 5 to 7 pairs of gills.
2. Fish with air bladder.