Science form 2 - chapter 1 to 3 (meanings)

SCIENCE
FORM 2

Chapter 1-3 (meanings)

CHAPTER 1 -

BIODIVERSITY

01 Biodiversity is the variety of living organisms on the Earth

that consist of plants, animals and microorganisms.

02 An endemic species is an original species which can only

be found in certain areas.

03 - Invertebrates are animals without a backbone.
- Vertebrates are animals with a backbone.

04 - Flowering plants are plants that produce flowers.
- Non-flowering plants are plants that do not produce

flowers.

CHAPTER 2 -

ECOSYSTEM

A food chain is the feeding relationship between living

organisms in a habitat

A food web is a combination of a few food chains.

The nutrient cycle is the cycle of non-organic chemical

elements.

A habitat is the natural surrounding or shelter for an

organism.

Adaptation is the modification or change in the body or

behaviour of organisms to help them keep on surviving.

Biological control is a method that uses organisms that are
natural predators, parasites or pathogens to reduce the

number of pests in an area.

CHAPTER 3 -

NUTRITION

01 A balanced diet is a diet that contains all the food classes
in the right quantities that are required by the body.

02 Calorific value is the total amount of energy released when
1 gram of food is completely burned.

03 Food digestion is a process of breaking down food from
big and complex particles into small, simple and soluble
molecules so that they can be absorbed into the body cells.

04 Villi are very tiny projections which increase the surface
area for food absorption.

05 Assimilation is the process of distributing the end product
of digestion for body cells.

06 Defecation is the process of
elimination of faeces
from the body.