Force and Laws of Motion — Science STD 9 — Question

Which of these would support the idea that mass is conserved in a reaction that produces gas as a product:

Which material did you use in the laboratory to observe vacuoles?

When a rubber balloon held between the hands is pressed, its shape changes. This happens because:

1. Balanced forces act on the balloon.
2. Unbalanced forces act on the balloon.
3. Frictional forces act on the balloon.
4. Gravitational forces act on the balloon.

White fibres of connective tissue are made up of:

1. Elastin.
2. Reticular fibre.
3. Collagen.
4. Myosin.

Plant length is increased by:

Photosynthetic pigments are located in:

1. Stroma.
2. Outer membrane of chloroplast.
3. Grana.
4. Inner membrane of chloroplast.

The interparticle attractive force ......... with increasing distance between particles:

Helium atom has an atomic mass of 4 u and two protons in its nucleus. How many neutrons does it have:

The cell organelle involved in forming complex sugars from simple sugars are:

A group of similar freely inter-breeding organisms constitutes a:

1. Species.
2. Genera.
3. Family.
4. Class.