Science field trip participation

Fragrance product is usually made up of volatile substances. What is volatile?

• easy to vaporize

• has a strong smell

• made up of organic materials

• difficult to be synthesized

Why water and oils are easily separable?

• because water is heavier than oil

• because water has stronger intermolecular forces

• because the molecular mass of water is very small compared to oils.

• because water is polar and most oils are nonpolar

What is the principle of separation technique using distillation?

• difference of polarity of liquid

• difference of boiling point of liquid

• difference of solubility of solid

• difference of particle size

“Greenhouse effect is the process by which radiations from the sun are absorbed by the greenhouse gases and not reflected back into space. This insulates the surface of the earth and prevents it from freezing.”

• True

• False

The sun’s radiations warm the plants and the air inside the greenhouse. The heat trapped inside can’t escape out and cools the greenhouse which is essential for the growth of the plants.

• True

• False

The depletion of the ozone layer results in the entry of the harmful UV rays to the earth’s surface that might lead to skin cancer and can also change the climate drastically.

• True

• False

Global warming is caused only by natural factors?

• True

• False

Composting is the process of

• Recycling of paper

• Burning of garden waste

• Decomposition of waste by microbes

• Drying of waste in Sun

Which organisms have major role in composting? Except

• Bacteria

• Plants

• Fungi

Which of the following term is used to refer beneficial bacteria

• Antibiotics

• Probiotic

• Prebiotic

• Postbiotic