Photosynthesis & Cellular Respiration

What is the main reason a plant releases oxygen during photosynthesis?

• oxygen is a waste product and would interfere with the plant's function

• oxygen given off by the plant attracts insects, which then pollinate the plant

• oxygen given off by the leaves combines with hydrogen in the air to form water vapor, which condenses and seeps into the soil to be used by the roots

• oxygen gas produced during photosynthesis is flammable and could pose a danger to the plant

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What are the waste products that plants excrete?

• oxygen and carbon dioxide

• carbon dioxide and water

• water and sugar

• sugar and carbon dioxide

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A dense population of plants is growing at the bottom of a farm pond. What will most drastically affect the rate of photosynthesis completed by the plants?

• amount of available oxygen dissolved in the water

• temperature of the water

• amount of light energy that penetrates the water and reaches the pond floor

• number of decomposers in the water that return minerals to the food chain

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The main result of aerobic respiration is the -

• production of ATP from the breakdown of glucose

• conversion of radiant energy into chemical energy

• production of lactic acid as an end product

• storage of energy in a polysaccharide

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Like animals, plants must sometimes excrete carbon dioxide as a waste product. Which process causes this waste product to be formed?

• A respiration

• B photosynthesis

• C transpiration

• D osmosis

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Energy conversions within a cell would be most severely limited by removal of the cell's - .

• vacuoles

• ribosomes

• endoplasmic reticulum

• mitochondria

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For what purpose do plant cells use oxygen?

• A for aerobic respiration

• B plant cells only use carbon dioxide

• C for photosynthesis

• D for anaerobic respiration

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Two test tubes were filled with a solution of bromothymol blue. A student exhaled through a straw into each tube, and the bromothymol blue turned yellow. An aquatic green plant was placed into each tube. What is the likely reason for the color change in the bromothymol blue solution?

• The solution became more acidic due to the exhaled carbon dioxide.

• The solution became more basic due to the exhaled carbon dioxide.

• The solution became neutral due to the exhaled carbon dioxide.

• The solution remained unchanged.

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Which statement best explains why the solution in the tube with the plant and no green film cover placed in sunlight returned to a blue color?

• oxygen was produced by photosynthesis

• oxygen was removed by respiration

• carbon dioxide was removed by photosynthesis

• carbon dioxide was removed by respiration

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Which of these statements best explains the process of energy conversion that takes place in the mitochondria?

• energy is required for carbon dioxide molecules to form six-carbon sugar molecules

• water molecules and radiant energy are necessary for anaerobic respiration to take place

• oxygen molecules release energy in the form of heat during combustion reactions

• the energy in the bonds of glucose molecules is transferred to the phosphate bonds in ATP

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