Question 1

Which of the following is a chemical property?

Accepted Answer

The ability of two or more substances to combine to form other substances is called Reactivity.

Question 2

Which of these is a starting point for primary succession?

Accepted Answer

Primary succession is the orderly and predictable series of events through which a stable ecosystem forms in a previously uninhabited region. Primary succession occurs in regions characterized by the absence of soil and living organisms.

Question 3

The closest algal relatives of land plants are

Accepted Answer

The charophytes are the extant group of green algae that are most closely related to modern land plants.

Question 4

Which molecules prevent cell membranes from dissolving in water?

Accepted Answer

Cell membranes are made up of phospholipids which prevents them from dissolving in water.

Question 5

Which of the following is a healthy blood pressure level?

Accepted Answer

Healthy blood pressure ranges from 120/80 to 90/60.

Question 6

What is a single celled organism called

Accepted Answer

An organism is a living thing, and there are two broad categories of organisms: those made up of only a single cell, and those made up of multiple cells. Single-celled organisms means which contains only one cell are called unicellular organisms. 'Uni-' means 'one,' so the name 'unicellular' literally means 'one cell.' Examples of Unicellular or Single celled organisms :: Prokaryotic organisms like Bacteria,... Some algae like green algae, euglena,...

Question 7

As water is cooled from 4 deg C to 0 deg C, its density

Accepted Answer

When water is cooled from 4°C to 0°C, its density decreases. When water cools from 4°C to 0°C, ice crystals begin to form because the water is approaching its freezing point. When water freezes, the water molecules form a lattice that increases the volume. As a result, the density decreases. This is why ice will float on top of water; ice has a lower density than the water.

Question 8

The amount of water vapor in the air is called

Accepted Answer

The amount of water vapor in the air is called Humidity. The amount of water vapor that air acn hold depends on the temperature of the air. The amount of water vapor in the air as compared with the amount of water that the air could hold is called Relative humidity.

Question 9

The end products of glycolysis are

Accepted Answer

Glycolysis involves the breaking down of a sugar into more manageable compounds in order to produce energy. The net end products of glycolysis are two Pyruvate, two NADH, and two ATP.

Question 10

Exercise improves memory and learning.

Accepted Answer

Exercise can boost your memory and thinking skills by improvising alertness, attention and motivation.

Question 11

Which of the following is a function of Earth's atmosphere?

Accepted Answer

Here all the options given are important functions of Earth's atmosphere.

Question 12

Chemically marble is known as

Accepted Answer

Chemically marble is known as Calcareous rock as it is composed of carbonate minerals like calcite or dolomite.

General Science Questions