unit 3 Life on Earth Flashcards

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1
Q

What is a niche

A

The role an organism plays in its comunity

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2
Q

What is a habitat

A

the place where an organism lives

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3
Q

What is a community

A

All the living organisms that live in a habitat

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4
Q

What are exapmples of a-biotic factrors

A

non-living things - light intensity, soil PH, soil moisture, temperature

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5
Q

Biotic factors

A

living things - disease, food availability, predation, grazing

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6
Q

what is biodiversity

A

the variation of between all living organisms on earth

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7
Q

What is intraspecific competition

A

Competition between the same species for the same resources, often more intense than interspecific

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8
Q

What is interspecific

A

Competition between different species for the same resources

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9
Q

What is bioaccumulation

A

the build up of pesticides throughout the foodchain

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10
Q

What is a biological control

A

When you insert a natural preditor into a community

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11
Q

What do biological indicator species do

A

Show the conditions in an area

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12
Q

what are the 3 types of isolation barriers

A

Behavioural
Ecological
Geographical

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13
Q

What is the first stage of photosynthesis

A

Light reactions

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14
Q

Describe this stage

A

Light enters the leaf and breaks H2O into hydrogen and oxygen also producing ATP. The oxygen evaporates out the cell and the ATP and hydrogen are needed for the second stage.

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15
Q

What is the second stage called

A

Carbon fixation

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16
Q

Describe this stage

A

The hydrogen from the first stage and the carbon dioxide make sugar.

17
Q

Name some limiting factors of photosynthesis

A

Light intensity
Temperature
Carbon dioxide concentration

18
Q

What is a mutation

A

A random change to genetic material