Abiotic and Biotic Factors Flashcards

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What does an abiotic factor mean?

A non-living part of the environment that affects living things.

A living part of the environment that affects other living things.

Light intensity, temperature, moisture level, and soil pH and mineral content.

Availability of food, number of predators, and competition.

It reduces photosynthesis, so plants grow more slowly and fewer survive.

Each species has an optimum temperature. If it gets too hot or too cold, they may not survive or breed, so their distribution changes.

If the pH is unsuitable, or minerals are low, plants cannot take in nutrients well, so growth is poor.

They need dissolved oxygen for respiration. Low oxygen can kill them, so fewer survive.

Higher carbon dioxide can increase photosynthesis up to a point. Low carbon dioxide limits growth.

Competition is when organisms try for the same resources, like food or mates. It is a biotic factor.

More food supports more individuals, so numbers can rise. Little food leads to fewer surviving, so numbers fall.

Disease can spread and kill or weaken organisms, so survival and reproduction drop and the population falls.