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

Food handlers can contaminate food when they

Accepted Answer

1) If they use the same cutting board/counter to cut raw chicken, and other foods with out sanitizing in between 2) If they have a cold, flu, or pink eye and are handling food, coughing without covering their mouth, then washing their hands 3) If they don't properly wash their vegetables 4) Not storing foods at proper temperatures And so many other reasons for Food handlers can contaminate food

Question 8

The term protoplasm was coined by

Accepted Answer

J. E. Purkinje

Question 9

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 10

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 11

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 12

Which practice reduces the risk of a boating emergency?

Accepted Answer

Developing a habit of wearing your lifejacket or PFD at all times also reduces the chance that you will drown should you find yourself in the water unexpectedly

Question 13

What is the role of NADP+ in photosynthesis?

Accepted Answer

NADP - Nicotinamide Adenine Dinucleotide Phosphate is one of the carrier molecules that transfers high-energy electrons from chlorophyll to other molecules NADP+ is the molecule that accepts the electrons given by water Its reduction by the protein FNR (Ferredoxin NADP+ reductase) gives NADPH,H+ NADPH,H+ can be used in the Calvin Cycle to reduce 1,3-Biphosphoglycerate (1,3-BPG) into Glyceraldehyde-3-phosphate (G3P), a monosaccharide It becomes NADP+ again and the cycle keeps repeating as long as the chloroplast receives sufficient and appropriate light

Question 14

Exercise improves memory and learning.

Accepted Answer

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

Question 15

Cognitive neuroscientists can examine the brain with

Accepted Answer

PET & MRI

Question 16

What is the best way to prevent pest infestation?

Accepted Answer

Pest infestation is nothing but the presence of large number of pests at a place, typically so as to cause damage or disease Climatic conditions affect a considerable number of pests Some are more active during warmer periods than others As these summer insects invade your home, they're likely in search of food, water, shelter, or have encountered an entrance To pest-proof your home this summer, it's best to remove their 'WHY’ or reason for entering your home * Keep your place clean and dry Make sure there is no food laying about * Removing food residue - food is a common attraction to a number of different pests * Regular disinfection of the surfaces

Question 17

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 18

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.

Question 19

Thermal energy is caused by the motion of

Accepted Answer

Both A & B

Question 20

Data collected to date indicate that

Accepted Answer

None of the above

General Science Questions