Praxis General Science

When a plant undergoes photosynthesis, one of the by-products is

• carbon dioxide

• light

• ozone

• oxygen

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Why is the nucleus so important to a living cell?

• It controls the production and elimination of cell waste.

• It controls most of the activities of the cell.

• It controls photosynthesis.

• It uses oxygen to make carbon dioxide.

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Which of the following do not have organelles?

• Muscle cells

• Protozoa

• Nerve cells

• Bacteria

Which of the following is not an example of a fruit?

• Raspberries

• Sunflower seeds

• Corn

• potato

Which of the following terms can be used to describe a bird?

• Crustacean, endoskeleton

• Endoskeleton, cold-blooded

• Invertebrate, omnivore

• Vertebrae, warm-blooded

Why are decomposers important to an ecosystem?

• They create soil for farming.

• They enhance the habitat with specialized particles important to life.

• They stabilize the soil.

• They make nutrients available for plants to use.

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Which of the following is the part of the skeletal system that protects the spinal cord?

• Marrow

• Cartilage

• Ligaments

• Vertebrae

A bruise on your skin is the result of which of the following?

• Overactive sweat glands

• Excess strain on the muscle

• Broken capillaries

• Swelling

The function that moves food from one part of the digestive system to another is called

• mechanical decomposition.

• respiration.

• digestion.

• peristalsis

Which of the following words are all associated with the nervous system?

• Hypothalamus, pons, cortex

• Which of the following words are all associated with the nervous system?

• Lymph nodes, spleen, tonsils

• Antigens, T cells, cilia