Nutrients and energy

Biological role of Nitrogen

• To make organic compounds

• Make proteins

• Make bones and shell

• Make haemoglobin

Which Nutreint is needed to make a component in the cell shown in figure

• Calcium

• Carbohydrates

• Iron

• Magnesium

How do nutrients cycle through marine ecosystems

• Taken by organisms and passed up food chains

• Become availabel after death and decay

• Become availbe as organism breath in the water

• Return to the surface as upwelling

• Sink through the water column as marine snow

What are the reactants for respiration

• carbon dioxide

• Oxygen

• Glucose

• water

Which of the following organisms are producers

• Hermit crab

• sea grass

• albatross

• Cynobacteria (blue-green algae)

4th trophic level of this food chain is

• Plant

• Mouse

• beetle

• owl

what is most likely to happen when there is an increase in grasshopper population (select 3)

• grains will decrease

• mouse population decrease

• rabbit population increase

• population of birds and owl increase

.............................................is an organism that feed on both plants and animals

factors affecting rate of population of damselfish are .. (select 4)

• food supply

• availibility of light

• disease

• competition

• predation

...............................ecosystems are having higher risk of destruction and pollution by human activities