ORGANISMS AND THEIR ENVIROMENT

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Cells & Cell Structures

Organisms and their enviroment:

PHYSICAL FACTORS:

TEMP:

TEMP AFFECTS RATES OF ORGANISM'S METABOLISM,

SOME ORGANISMS CANNOT MAINTAIN HIGH BODY TEMP FOR LONG.

THEY CANNOT TOLERATE HIGH/EXTREME TEMPS.

ORGANISMS THAT CAN MAINTAIN A CONSTANT HIGH BODY TEMP MAY ALSO STRUGGLE TO SURVIVE IN EXTREME TEMPS.

TEMPERATURE:

AVAILABILITY OF NUTRIENTS:

NUTRIENTS SUCH AS NITRATES ARE ESSENTIAL FOR GROWTH.

IF THERE IS A LOW CONCENTRATION OF THESE NUTRIENTS, THESE ORGANISMS STRUGGLE TO SURVIVE.

AMOUNT OF LIGHT:

PLANTS REQUIRE LIGHT FOR PHOTOSYNTHESIS.

IN LOW LIGHT INTENSITIES PLANTS GROW VERY SLOWLY.

AVAILABILITY OF OXYGEN:

OXYGEN IS VITAL FOR AEROBIC RESPIRATION.

IT CAN BECOME LIMITED IN SOIL, SO PLANT ROOTS CANNOT GROW AND ABSORB MINERAL IONS AND WATER.

IT CAN ALMOST BECOME LIMITED IN WATER, SO AQUATIC ORGANISMS STRUGGLE TO RESPIRE/SURVIVE.

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