Gravitation — Science STD 9 — Question

Goldstein’s experiments which involved passing high voltage electricity through gases at very low pressure resulted in the discovery of:

1. Electron.
2. Proton.
3. Nucleus.
4. Neutron.

A particle X has 17 protons, 18 neutrons and 18 electrons. This particle is most likely to be:

SARS and Swine flu are caused by:

1. Virus.
2. Virus and bacterium.
3. Virus and protozoan.
4. Virus and helminth.

Milk does not provide:

1. Vitamin A and D.
2. Carbohydrates, proteins and fats.
3. Minerals such as phosphorus and calcium.
4. Iron.

Which of the following biomolecules forms the integral part of the cell wall?

Epithelial tissue always has an exposed outer surface and an inner surface anchored to connective tissue by a thin, non-cellular structure called the:

1. Nonstratified layer.
2. Stratified membrane.
3. Basement membrane.
4. Fibroblast.

A particle is moving in a circular path of radius r. Its displacement after moving through half the circle would be:

Which of the following is incorrect pair?

Whose living cells provide tensile and mechanical strength?

1. Collenchymas.
2. Sclerenchyma.
3. Phloem.
4. Sclereids.