B6 - Microscopic life in water Flashcards Preview

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Flashcards in B6 - Microscopic life in water Deck (18):

Why are algal blooms dangerous?

Algal blooms are dangerous because they release toxins into the water as they decompose.


What are the two types of plankton?

The two types of plankton are:


What are phytoplankton?

Phytoplankton are microscopic plants.


What are zooplankton?

Zooplankton are microscopic animals.


Why are phytoplankton producers?

They are producers because they photosynthesise to make food.


What happens to the number of plankton in winter?

The number of plankton in winter decreases as the water gets cold.


What are advantages to living in water?

- organisms do not dry out, so there is no dehydration
- in a large volume of water there is less variation in temperature during the year
- organisms can grow bigger
- organisms can dispose of waste without losing water


What are the disadvantages to living in water?

- organisms can find it difficult to maintain water balance in their cells
- some organisms find it difficult to move against the currents


When phytoplankton levels drop, why do zooplankton levels drop?

Because zooplankton feed on phytoplankton so they will have less food.


What is a contractile vacuole?

A structure in amoeba that removes excess water.


Describe the process of amoeba removing excess water.

1) energy is used to collect excess water in small vacuoles
2) small vacuoles merge to form a large contractile vacuole
3) the contractile vacuole bursts, emptying its contents


What are grazing food webs?

Grazing food webs are food webs that begin with green plants.


What is marine snow?

Marine snow is organic matter that falls from the surface of oceans to the depths where it is used for feed.


Wha tare the different types of water pollution?

- organic matter from sewage
- oil from factories or oil tankers at sea
- PCB's from old electrical equipment
- fertilisers from farms
- pesticides from farms
- detergents from homes and factories


How does air pollution affect aquatic life?

Burning fossils fuels can cause acid rain which can turn lakes acidic and kill animals in the lake.


What is eutrophication?

Eutrophication is the process of water becoming rich in fertilisers, causing algae to bloom and block sunlight preventing creatures and plants from photosynthesising/surviving.


What are biological indicators?

Organisms which live in water - their presence tells scientists how polluted the water is.


What are the problems with DDT and PCB's?

They are not broken down by the body and therefore accumulate over time.