end of chapter 8 questions

The main source of energy for all life comes from ____.

• the Earth

• the moon

• the sun

• the food we eat/make

Most plants appear green because chlorophyll

• absorbs green light.

• absorbs violet light.

• reflects green light.

• does not absorb violet light.

The reactants of photosynthesis are

• sugar and water.

• sugar and oxygen.

• carbon dioxide and water.

• carbon dioxide and oxygen.

Which statement about photosynthesis is correct?

• Plants get the energy they need for photosynthesis from water.

• Plants get the energy they need for photosynthesis from soil.

• Plants get the energy they need for photosynthesis from sunlight.

• Plants do not require energy to perform photosynthesis.

What are the products of photosynthesis?

• Carbon dioxide and water

• Carbon dioxide and oxygen

• Glucose, water and oxygen

• Only glucose and oxygen

What primary pigments absorbs sunlight for photosynthesis?

• chloroplast

• thylakoid

• carotenoids

• chlorophylls

What is the first step in photosynthesis?

• Nutrients from the soil are turned into carbohydrates when combined with water

• Light causes oxygen to pair with hydrogen, forming water for the plant

• Water is split by chlorophyll

• Photons present in light strike and excite electrons in chlorophyll

• Light reduces sugars present in the plant cells to energized derivatives

Which gas is removed from the atmosphere during photosynthesis?

• hydrogen

• oxygen

• nitrogen

• carbon dioxide

Which of the following statements is a correct distinction between autotrophs and heterotrophs?

• Autotrophs, but not heterotrophs, can nourish themselves beginning with CO₂ and other nutrients that are inorganic.

• Only heterotrophs require chemical compounds from the environment.

• Cellular respiration is unique to heterotrophs.

• Only heterotrophs have mitochondria.

The light reactions supply the Calvin cycle with

• light energy.

• H₂O and NADPH.

• CO₂ and ATP.

• ATP and NADPH.