Unit C exam

Question 1

What color of visible light do plants absorb ?
What color of visible lights do plants reflect?

Answer 1

Plants absorb blue (400-500nm) and red (600-700nm)

They reflect green light 500-550NM

Question 2

What are photons?

Answer 2

Photons are light particles

Question 3

Label the following parts of the chloroplast

Answer 3

Thylakoid, grana, inner membrane, outer membrane, stroma

Question 4

What part of the plant are most chloroplasts found in?

Answer 4

Leaf Mesophyll (the internal cell layers of a leaf)

Question 5

What pigment absorbs light energy in plants?

Answer 5

Chlorophyll, the primary pigment used in photosynthesis

Question 6

What is the only pigment (be specific) found in plants that can transfer energy from sunlight to the reactions of photosynthesis?

Answer 6

Chlorophyll A

Question 7

What is the only pigment (be specific) found in plants that can transfer energy from sunlight to the reactions of photosynthesis?

Answer 7

Chlorophyll A

Question 8

What are the accessory pigment in plants? And what’s their purpose

Answer 8

Chlorophyll B absorbs mostly blue and yellow light and reflects yellow-green pigments.

Carotenoids absorb light in the blue-green ranges and reflect the yellow, red and orange ranges

Question 9

The main function of a chloroplast is to convert light energy into ______ energy in the form of sugar or other carbohydrates

Answer 9

Chemical Energy

Question 10

Chloroplast are filled with a gel like substance called the _____, and layers of flattened membranes called _____

Answer 10

Stroma and Thylakoids

Question 11

These chloroplast membranes contain all of the pigments involved in the chemical reactions of photosynthesis which involve the _____ of light

Answer 11

Absorption

Question 12

What does a stack of discs or thylakoid membranes make?

Answer 12

Grana

Question 13

A molecule that absorbs light is called a ______. Each kind of pigment absorbs lights of different wavelengths and reflects specific wave lengths, thus each pigment appears as a different ____. Chlorophyll absorbs light in the violet, blue and _____ wavelengths, but since it reflects green wavelengths it appears _____ to the human eye

Answer 13

Pigment, color, red, green

Question 14

The pigment most directly used in photosynthesis is the _________.
Frequently plants also have accessory pigments present such as the _________, and the red, orange and yellow pigments known as the _____. The value of the accessory pigments is that htheh extend the range of usable lights

Answer 14

Grass green chlorophyll A, yellow- green chlorophyll b, carotenoids/beta-carotene

Question 15

Scattered throughout the thylakoid membranes are millions of photosynthetic Units which capture energy from the ______ in the light reaction process. These photosynthetic units are arranged into special bundles or areas called _____

Answer 15

Sunlight, photosystems

Question 16

Absorption of photon energy causes chlorophyll A to lose an ______ to an electron acceptor. however, if chlorophyll A is to continue to absorb photon energy, it must replace the electron it lost. these replacement electrons from from the splitting of _____ inside the thylakoid membrane

Answer 16

Electron, water

Question 17

In a process called _____, a water molecule is split, yielding into two _____; two electrons and a half an oxygen atom, which quickly combines with another oxygen to form a molecule of oxygen gas. The oxygen formed by photolysis is the oxygen that plants release into the ______

Answer 17

Photolysis, Hydrogens, Atmosphere

Question 18

So in the light reaction, electrons are transported from water to different electron acceptors found in the ________ chain. This process is a chain like series of ______ (lose electrons) and _____reduction (gain electrons ) reactions

Answer 18

Electron transport, oxidation, reduction

Question 19

Why is photosynthesis considered an energy storing reaction?

Answer 19

It’s considered an energy- storing reaction because it converts sunlight into chemical energy stored in glucose(sugar). this stored energy can be used by plants for growth and by other organisms as food.