Life Science Concepts and Energy Types

The main function of the heart in the human body is to:

• pump blood throughout the body

• digest food

• control body temperature

• filter waste from the blood

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The part of the cell that controls its activities and contains DNA is called the:

• Cytoplasm

• Nucleus

• Cell membrane

• Mitochondria

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Plants take in which gas during photosynthesis?

• Oxygen

• Carbon Dioxide

• Nitrogen

• Hydrogen

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What gas do humans breathe out that plants need?

• Oxygen

• Carbon Dioxide

• Nitrogen

• Hydrogen

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The difference between a plant cell and an animal cell is:

• Plant cells have a cell wall, animal cells do not.

• Animal cells have chloroplasts, plant cells do not.

• Both have a cell wall.

• Neither have a cell wall.

An ecosystem is a community of living organisms in conjunction with the nonliving components of their environment, interacting as a system. Which of the following is an example of an ecosystem?

• A classroom

• A forest

• A computer

• A car

The three main stages of the life cycle of a butterfly are:

• Egg, Larva, Pupa

• Egg, Pupa, Adult

• Larva, Pupa, Adult

• Egg, Larva, Adult

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What is a food chain? Name three levels in order.

• A food chain is a sequence of organisms each dependent on the next as a source of food. The three levels are producers, consumers, and decomposers.

• A food chain is a type of ecosystem. The three levels are herbivores, carnivores, and omnivores.

• A food chain is a network of food webs. The three levels are primary, secondary, and tertiary consumers.

• A food chain is a linear sequence of organisms. The three levels are plants, animals, and bacteria.

Natural selection is a process by which:

• organisms with favorable traits survive and reproduce

• all organisms survive regardless of traits

• organisms with unfavorable traits reproduce more

• environmental changes do not affect organisms

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One reason an animal might go extinct is:

• Loss of habitat

• Abundance of food

• Increase in population

• Stable climate

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