Natural Resources — Science STD 9 — Question

Movement of a substance from the area of low concentration to an area of high concentration is called diffusion.

All kinds of plastids have pigments.

The taxonomic term taxon can substitute for any rank in the classification.

State whether the following statements are true or false: The buoyant force depends on the nature of object immersed in the liquid.

State whether the following statements are true or false: A chloride ion has negative charge because it has more electrons than a neutral atom.

Communicable diseases are non-infectious.

Collagen occurs in yellow elastic fibre.

Streptomycin inhibits protein synthesis in pathogenic bacteria.

Lysosomes keep the cells clean by digesting foreign materials and worn out cell organelles.

An environmental stress upsets the normal physiological functioning of the organisms.