Cell Biology and Matter Concepts

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

What part of the cell controls its activities and contains DNA?

• Nucleus

• Cytoplasm

• Cell membrane

• Mitochondria

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What gas do plants take in during photosynthesis?

• Oxygen

• Carbon Dioxide

• Nitrogen

• Hydrogen

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What gas do humans breathe out that plants need?

• Oxygen

• Nitrogen

• Carbon Dioxide

• Hydrogen

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What is the difference between a plant cell and an animal cell?

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

• Animal cells have chloroplasts, while plant cells do not.

• Plant cells have a larger vacuole compared to animal cells.

• Animal cells have a rigid structure, while plant cells are flexible.

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 forest

• A single tree

• A rock

• 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 sequence of organisms each dependent on the next as a source of food; producers, consumers, decomposers

• A network of interconnected food webs; primary, secondary, tertiary

• A linear sequence of organisms; herbivores, carnivores, omnivores

• A system of interdependent food chains; predators, prey, scavengers

What is natural selection?

• A process by which organisms better adapted to their environment tend to survive and produce more offspring.

• A method of breeding plants and animals for specific traits.

• A random change in the DNA sequence of an organism.

• A process of energy transfer in an ecosystem.

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One reason an animal might go extinct is:

• habitat loss

• abundance of food

• increase in population

• favorable climate conditions

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