Gr9-HW2-Photosynthesis

Katie is making a model to illustrate the functions of ADP and ATP in photosynthesis. Which model BEST illustrates the role of ATP in photosynthesis?

• a power plant that generates energy

• a rechargeable battery that stores and releases energy

• a pigment that receives the energy of sunlight

• a pan that carries coal

• a hammer that helps break apart water molecules

Plants use the sugars produced by photosynthesis to synthesize which of the following types of biomolecules?

I. complex carbohydrates

II. amino acids

III. lipids

• I only

• II only

• III only

• I, II, and III

Tags

NGSS.HS-LS1-6

Photosynthesis converts light energy to stored chemical energy. What BEST describes the role of molecular oxygen (O2) in this process?

• an essential reactant that is used to make sugars

• an optional reactant, the presence of which speeds up the process

• the main product that stores chemical energy for use by the organism

• a byproduct that is released into the atmosphere

Tags

NGSS.HS-LS1-5

NGSS.HS-LS2-5

What BEST describes the role of water molecules in photosynthesis?

• Water molecules are a structural component of chloroplasts; they absorb light and pass the energy to chlorophyll.

• Water molecules are an intermediate of photosynthesis, and are part of the electron transport chain.

• Water molecules are an input of photosynthesis; they split apart and supply electrons to chlorophyll.

• Water molecules are an output of photosynthesisthey are released at the end of the electron transport chain.

Tags

NGSS.HS-LS2-3

Professor Danielle conducts an experiment on chloroplasts by deactivating several enzymes used for the light-independent reactions. All components of the light-dependent reactions remain present.

• Yes

• No

During photosynthesis, how is the light energy that strikes the cell transformed into the chemical energy stored in sugars?

• Energy is transferred directly to sugars, with no intermediates.

• Energy is transferred to sugars through intermediates such as H2O, O2, and CO2.

• Energy is transferred to sugars through intermediates, such as ATP and NADPH.

• Energy is transferred to sugars through intermediates, such as chloroplasts.

Tags

NGSS.HS-LS1-5

Which phrase accurately describes the role of the light-independent reactions?

• transforming light energy into chemical energy

• transferring chemical energy to high-energy sugars

• returning chemical energy to light energy

• transferring light energy among different compounds

Tags

NGSS.HS-LS1-5

NGSS.HS-LS1-6