0610 Biology IGCSE unit 19 and 20

What is a consumer in a food chain?

• An organism that gets its energy by feeding on other organisms

• An organism that produces its own food

• An organism that breaks down dead material

• An organism that only eats plants

Tags

NGSS.MS-LS2-3

Explain the differences between pyramids of numbers and pyramids of biomass, and give an example of when their shapes might differ.

• Pyramids of numbers can be inverted if a single large producer supports many consumers; pyramids of biomass usually remain upright because they show total mass at each level

• Pyramids of numbers always show energy loss; pyramids of biomass always show energy gain

• Pyramids of numbers and biomass always have the same number of levels

• Pyramids of numbers show only animals; pyramids of biomass show only plants

Tags

NGSS.MS-LS2-3

Which of the following best describes a pyramid of energy?

• It shows the flow of energy at each trophic level in a food chain

• It shows the number of organisms at each level

• It shows the migration of animals

• It shows the amount of sunlight received by plants

Tags

NGSS.MS-LS2-3

Why is the transfer of energy from one trophic level to another often not efficient?

• Energy is lost as heat, movement, and waste

• All energy is transferred perfectly

• Energy is only lost through photosynthesis

• Energy is stored in the soil

Tags

NGSS.MS-LS2-3

NGSS.MS-LS1-6

Which process in the carbon cycle involves plants using sunlight to convert carbon dioxide into glucose?

• Photosynthesis

• Respiration

• Decomposition

• Combustion

Tags

NGSS.MS-LS2-3

NGSS.MS-LS1-6

What is the main role of respiration in the carbon cycle?

• Releasing carbon dioxide back into the atmosphere

• Producing fossil fuels

• Absorbing carbon dioxide from the air

• Breaking down proteins

What is formed from the decomposition of dead plants and animals over millions of years in the carbon cycle?

• Fossil fuels

• Proteins

• Nitrate ions

• Amino acids

Tags

NGSS.MS-LS2-3

Which process in the nitrogen cycle converts plant and animal protein into ammonium ions?

• Deamination

• Nitrification

• Denitrification

• Photosynthesis

What is a population in ecological terms?

• A group of organisms of one species living in the same area at the same time

• All the populations of different species in an ecosystem

• A unit containing the community of organisms and their environment

• A group of microorganisms in the soil

How is a community defined in ecology?

• All the populations of different species in an ecosystem

• A group of one species in an area

• A unit containing organisms and their environment

• A group of plants only