N

Question 1

Natural selection

Answer 1

Factors such as competition and predation affect the survival of a species. As a result, only those individuals adapted to survive have the greater chance to pass on their genes to the next generation.

Question 2

Negative feedback

Answer 2

the mechanism used in homeostasis for maintaining near constant conditions in the body.

Question 3

Nerve

Answer 3

A bundle of nerve cells (neurones) which pass from the central nervous system to a certain part of the body.

Question 4

Neurone

Answer 4

A nerve cell.

Question 5

Nitrification

Answer 5

Conversion of ammonium ions to nitrate ions by bacteria.

Question 6

Nitrifying bacteria

Answer 6

Bacteria found in the soil that convert ammonium ions into nitrite ions and nitrite ions into nitrate ions.

Question 7

Nitrogen-fixing bacteria

Answer 7

Bacteria found both in the soil and in the roots of legume plants that convert atmospheric nitrogen into nitrogen containing compounds such as amino acids

Question 8

Nitrogen

Answer 8

An element needed for healthy plant growth, taken up by plant roots in the form of nitrate ions. Chemical fertilisers often supply nitrate ions.

Question 9

Non-biodegradable

Answer 9

Materials that will not break down in the environment, e.g. most plastics.

Question 10

Nucleus

Answer 10

The part of the cell which contains genetic info in the form of chromosomes. The nucleus controls the activities of the cell. Nuclei may be haploid or diploid.

Question 11

Nutrition

Answer 11

Taking in of nutrients which are organic substance and mineral ions, containing raw materials or energy for growth and tissue repair, absorbing and assimilation them.