BIO Ch4

Which group includes photosynthetic members?

Bacteria Protists Plants All of these

Choose the best explanation as to why both consumers and producers perform cellular respiration.

Both consumers and producers perform cellular respiration to produce the sugars that will be "burned" to fuel the energy of life.

How do we know green light is not absorbed by chlorophyll?

Green light is the wavelength of light that is reflected instead of absorbed by the chloroplasts.

What is the role of mitochondria in plants?

produce ATP

During the light reactions of photosynthesis, chlorophyll absorbs energy from sunlight. This energy is used to __________.

split water to produce O2 and high-energy electrons

Organize the following steps of the light reaction in order.

Absorb sunlight, split water, produce oxygen, produce high-energy electron carriers

Plastids are storage organelles. A chloroplast is a type of plastid. What does a chloroplast store?

Chlorophyll

What is the role of light in photosynthesis?

It energizes electrons.

Which of the following is a waste product of photosynthesis?

O2

Name the fluid-filled interior of the chloroplast.

Stroma

Why do some leaves change color (red, yellow, orange, etc.) in the fall?

The chlorophyll molecule breaks down and other pigments now become visible.

In a recent newspaper article promoting the eating of seaweed and seaweed products, the argument was made that doing so was a more efficient use of energy than eating animals. Why would eating seaweed be more energy efficient than eating an animal?

The energy found in animal matter represents a fraction of the energy found in the plant matter eaten by the animal. It would be better to just eat the plant and skip a step.

Some bacteria are photosynthetic. Part of the definition of a prokaryote is that they have no membrane-bound organelles, including chloroplasts. Explain how bacteria carry out photosynthesis without chloroplasts.

They still have thylakoids, they just are not compartmentalized into chloroplasts.

Identify the principal role of cellular respiration.

To convert the chemical energy of sugars into the chemical energy that fuels life's processes

The chemical reactions of photosynthesis occur in which cellular organelle?

chloroplast

Water behind a dam has a certain amount of stored energy that can be released as the water falls over the top of the dam. It may be enough energy to turn a mill wheel or an electricity-generating turbine. Choose the term that best describes the type of energy stored in the water at the top of the dam.

potential energy

in photosynthesis, carbon dioxide enters a leaf through pores called __________.

stomata

Which of the following best describes the flow of energy through an ecosystem?

sunlight → chemical energy → heat

What is the definition of energy?

the capacity to do work

Select the ultimate source of energy for nearly every organism on this planet.

the sun

How does CO2 enter a plant?

through the stoma