8 plants food

If you want to buy a colored light bulb for your indoor plants, the least effective color would be

• red

• blue

• green

• yellow

• orange

If the hydrogen atoms of water are radioactively labeled, which products of photosynthesis, if any, will also have this radio-labeled hydrogen?

• water and oxygen gas both

• water only

• sugar only

• water and sugar both

• water, sugar, and oxygen gas

Where does photosynthesis occur in eukaryotes?

• plasma membrane

• Golgi bodies

• cytosol

• mitochondria

• chloroplasts

Choose the most correct statement about the two phases of photosynthesis.

• The light-dependent reactions occur in the cytosol; the light-independent reactions occur in the stroma.

• The products of the light-dependent reactions are ATP, NADPH, and O2; the products of the light-independent reactions are ADP, NADP+, and sugar.

• The light-dependent reactions occur during the daylight hours; the light-independent reactions occur when it is dark.

• The light-dependent reactions produce water as a by-product; the light-independent reactions produce carbon dioxide as a waste product.

• The products of the light-dependent reactions are ADP, NADP+, and O2; the products of the light-independent reactions are ATP, NADPH, and sugar.

Fluorescence occurs when

• a high-energy electron returns to its ground state by releasing energy in a photon.

• a low-energy electron moves to a high-energy state by absorbing heat.

• a high-energy electron leaves its nucleus and moves to a different molecule.

• a pigment molecule accepts a high energy electron and releases a photon of energy

• the energy from an electron is transferred to a different molecule while the electron returns to the ground state.

The molecule of chlorophyll a in photosystem II's reaction center is known as P680 because

• it absorbs 680 photons per minute.

• it absorbs photons with a wavelength of 680 nm.

• there are exactly 680 accessory pigments in the photosystem.

• it will generate 680 molecules of ATP per photon absorbed.

• there are 680 electrons that can be energized by light.

In the light-dependent reactions of photosynthesis, an excited electron from photosystem II is passed along an electron transport chain to _?_.

• NAD+

• NADH

• photosystem I

• oxygen

• water

The chemical structure of chlorophyll is based on a complex organic ring structure, a long hydrophobic side chain and an atom of _?_ in the center of the ring.

• carbon

• manganese

• magnesium

• iron

• nitrogen

All of the following processes are associated with photosystem I EXCEPT

• ATP synthesis.

• NADPH synthesis.

• cyclic electron flow.

• accepting electrons flowing from the electron transport chain.

• splitting of water.

The primary purpose of the light-dependent reactions is to

• provide electrons and energy for the light-independent reactions.

• generate O2 gas.

• make ADP in cyclic photophosphorylation.

• transfer electrons to the primary electron acceptors.

• produce sugars such as glucose.