Page 31 - Year 8

Geography: Population: 3 of 7 Geography: Tropical Rainforests: 4 of 7

TROPICAL RAINFOREST AND BIOMES
• Sparsely Populated – Places which contain few people per km sq. KEY WORDS
• Densely populated – Places which contain many people per km sq.
• Population density – The number of people per km sq. ADAPTATIONS how plants and
animals change to their conditions

BIOME a very large ecosystem (eg
rainforest)

BUTTRESS ROOT large triangular
roots that hold up trees in the
Stages of the DTM rainforest
Stage 1: Limited medical care + poor diet = high infant mortality. CANOPY the top of trees in the

• Strong religious values = high birth rate. Example: Indigenous Tribes in the Amazon rainforest Earth’s Major Biomes
Rainforest.
Stage 2: Increase in access to basic medical care = decreased infant mortality and death rate. CONSERVATION protecting or looking
after something

• Diets also improved. Birth rate remains high as children are needed to work on farms.
ECOSYSTEM a place with plants and
• Birth rate also remains high as religion plays a significant role in society. Example: animals in it
Afghanistan.
Factors affecting Population Density Stage 3: Decrease in birth rate as women are able to access education.
Human = Red EMERGENT the tallest trees in the
rainforest
Physical = Black • Decrease in birth rate as religion loses importance in society and contraception
becomes available.

Densely Populated Sparsely Populated • Death rate continues to decline due to improvements in diet, healthcare and physical FOREST FLOOR the ground level in
fitness. the forest
Pleasant climate Steep slopes • Total population continues to increase as there is natural increase. Example: India. MINING taking valuable minerals out
Stage 4: Birth rate remains low and fluctuating as women put careers before having children. of the ground
Fertile soil Poor soils
• Death rate remains low due to improvements in healthcare, diet and physical fitness.
Access to infrastructure and Lack of access to infrastructure SHRUB LAYER the layer of small
services • Total population reaches its peak and begins to fall. Example: The UK. plants above the forest floor.
Access to high paying jobs Low paying, low skill jobs Stage 5: Death rate is greater than birth rate = natural decrease.
UNDERCANOPY the layer underneath
• Ageing population due to improvements in healthcare, diet and physical fitness. the canopy

• Children are expensive so birth rates continue to fall.