Unit 2 Test (Revised)

Food is digested to the molecular level, absorbed, and then carried to the cells.  The dissolved waste molecules produced by the cells are removed primarily from the blood by the

• skin
• lungs
• kidneys
• large intestine

As a corn plant ages, its leaves grow.  Which process is directly responsible for the growth of these leaves?

• the division of cells in the plant
• the release of oxygen from the plant
• the absorption of carbon dioxide in the stem
• the transportation of nutrients from the roots

Which pair of human body systems functions MOST closely together?

• nervous and excretory
• digestive and muscular
• skeletal and circulatory
• respiratory and cardiovascular

Bone cells need nutrients.  Which two systems get nutrients to bone cells?

• the digestive system and the circulatory system
• the circulatory system and the respiratory system
• the respiratory system and the skeletal system
• the skeletal system and the digestive system

Agnes learned that the brain, spinal cord, and nerves work together.  What do they combine to form?

• a cell
• a tissue
• an organ
• a system

The trees in a local park have been recently damaged by a swarm of beetles.  The beetles have nested in the trees and eaten all the leaves.  Which statement BEST explains why losing all of their leaves might kill the trees?

• The trees will not be able to reproduce.
• The trees will not be able to make food.
• The trees will not be able to take in water.
• The trees will not be able to absorb nutrients.

Which is one reason why the heart pumps faster during exercise?

• the need for increased digeston to provide fuel
• the elevated demand for fuel and oxygen in the muscles
• the decreased demand for blood flow to central nervous system
• the contraction of blood vessels to muscles, increasing blood pressure

Which part of a plant cell captures sunlight and converts the energy into food?

• nucleus
• chloroplast
• cell membrane
• cell wall

Cells perform many different processes that an organism needs to survive and grow.  Which is the MAIN function of the process of cellular respiration?

• the production of sugar
• the release of energy
• the formation of new proteins for the cell
• the removal of waste products from the cell

Which of these systems functions to protect and support vital organs?

• digestive
• skeletal
• nervous
• excretory