Chapter 10 Photosynthesis

Question 0

What is an autotroph? A heterotroph?

Answer 0

An autotroph is an organism that sustains itself without eating anything derived from other living things. A heterotroph is an organism that obtains their organic molecules by eating other organisms or substances produced by them.

Question 1

What is photosynthesis?

Answer 1

The conversion of solar energy to chemical energy.

Question 2

What are the three modes of nutrition for heterotrophs?

Answer 2

1. Animals that eat plants.
2. Animals that eat other animals.
3. Organisms that are decomposers.

Question 3

What kinds of organisms are autotrophs?

Answer 3

Self feeders or producers.

Question 4

Where are chloroplasts concentrated in the leaf?

Answer 4

They are concentrated in the leaf’s mesophyll.

Question 5

What is the microscopic pore through which CO2/O2, and water vapor enter/exit the leaf?

Answer 5

The stomata.

Question 6

What are thylakoids?

Answer 6

A membrane system made up or made up of sacs.

Question 7

What molecule is found in the membrane of thylakoids?

Answer 7

Chlorophyll.

Question 8

What is the term for the production of ATP via chemiosmosis during the light reactions?

Answer 8

Photophosphorylation.

Question 9

What process incorporates CO2 into an organic molecule?

Answer 9

The Calvin Cycle.

Question 10

What are the wavelengths of light that we can see referred to as?

Answer 10

Visible light.

Question 11

Light waves are often thought of as discrete particles. What are these particles called?

Answer 11

Photons.

Question 12

How are energy and wavelength related?

Answer 12

They are inversely related.

Question 13

What are the three things that can happen to light when it hits a surface?

Answer 13

1. Absorption.
2. Reflection.
3. Transmittance.

Question 14

The light we see is ( ) everything else is ( ).

Answer 14

Reflected, absorbed or transmitted.

Question 15

Which photosynthetic pigment is a red/yellow accessory pigment?

Answer 15

Carotenoids.

Question 16

Which photosynthetic pigment reflects green/yellow light and absorbs violet/blue/orange/red light?

Answer 16

Chlorophyll A.

Question 17

What happens to electrons when pigment molecules absorb a photon of light?

Answer 17

They become excited. This energizes the electron and makes it unstable. When it returns to the ground state it releases energy (heat).

Question 18

What are photosystems?

Answer 18

A light capturing unit located in the thylakoid membrane of a chloroplast.

Question 19

What part of a photosystem accepts an electron from the pigment molecules?

Answer 19

A primary electron acceptor within the reaction-center complex.

Question 20

During which part of photosynthesis (light reactions or Calvin Cycle) is water split?

Answer 20

Light reactions.

Question 21

What happens to the H+ and electrons of water split during the light reactions?

Answer 21

The excited electron passes to PS 1 using an ETC. The movement or electrons and H+ allows for ATP production. NADP+ gains H+ and electrons, moves onto the Calvin Cycle.

Question 22

What are the three stages of the Calvin Cycle?

Answer 22

1. Carbon fixation.
2. Reduction.
3. Regeneration.

Question 23

During carbon fixation, what molecule is CO2 attached to?

Answer 23

RuBP

Question 24

What is the end product of the Reduction stage of the Calvin Cycle?

Answer 24

6 G3P molecules.

Question 25

What happens to RuBP at the end of the Calvin Cycle?

Answer 25

RuBP can then accept CO2, or continue on the metabolic pathway to become glucose.

Question 26

How are CAM plants different from C3 and C4 plants?

Answer 26

Their stomata close tightly during the day to conserve water.

Question 27

Which type of plant uses the Calvin Cycle to fix carbon?

Answer 27

C3 plants.