Tissues — Science STD 9 — Question

Cell wall of plant cell is a living structure.

There is no situation in the universe when velocity is zero but acceleration is non-zero. [True/ False]

State whether the following statements are true or false: Thomson proposed that the nucleus of an atom contains protons and neutrons.

State whether the following statements are true or false: 'Archimedes’ principle can also be applied to gases.

Cardiac muscles undergo rhythmic contraction and relaxation throughout life.

Work done by gravity on a man moving on horizontal surface is negative. [True/ False]

Communicable diseases are non-infectious.

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

Intercellular spaces occur in collenchymas.