2.4

Question 1

What is the main organ for photosynthesis in plants?

Answer 1

Leaves

Question 2

True or False: Photosynthesis primarily occurs in the roots of plants.

Answer 2

False

Question 3

Fill in the blank: The process of photosynthesis converts _____ energy into chemical energy.

Answer 3

light

Question 4

What pigment is primarily responsible for capturing light energy in leaves?

Answer 4

Chlorophyll

Question 5

Which part of the leaf contains the majority of chloroplasts?

Answer 5

Mesophyll

Question 6

Multiple Choice: What gas do plants take in during photosynthesis? A) Oxygen B) Carbon Dioxide C) Nitrogen

Answer 6

B) Carbon Dioxide

Question 7

What are the two main stages of photosynthesis?

Answer 7

Light-dependent reactions and light-independent reactions (Calvin cycle)

Question 8

True or False: Stomata are openings on the leaf surface that allow gas exchange.

Answer 8

True

Question 9

Short Answer: Name one factor that affects the rate of photosynthesis.

Answer 9

Light intensity, carbon dioxide concentration, or temperature

Question 10

Fill in the blank: The chloroplasts in plant cells are the sites of _____ synthesis.

Answer 10

photosynthesis

Question 11

What is the role of water in photosynthesis?

Answer 11

Water is used as a reactant in the light-dependent reactions.

Question 12

Multiple Choice: Which of the following is a product of photosynthesis? A) Glucose B) Water C) Carbon Dioxide

Answer 12

A) Glucose

Question 13

What is the overall chemical equation for photosynthesis?

Answer 13

6CO2 + 12H2O (light energy) → C6H12O6 + 6O2+6h20

Question 14

True or False: All plants perform photosynthesis.

Answer 14

False (some plants are parasitic or carnivorous)

Question 15

Short Answer: How do leaves adapt to maximize photosynthesis?

Answer 15

Leaves are broad and flat to capture more light, and they have a thin structure to facilitate gas exchange.

Question 16

What is the function of guard cells in relation to photosynthesis?

Answer 16

Guard cells regulate the opening and closing of stomata.

Question 17

Multiple Choice: Which light wavelength is most effective for photosynthesis? A) Green B) Blue C) Yellow

Answer 17

B) Blue

Question 18

True or False: Photosynthesis only occurs during the day.

Answer 18

False (some processes continue at night)

Question 19

Short Answer: What are thylakoids?

Answer 19

Thylakoids are membrane-bound structures within chloroplasts where the light-dependent reactions occur.

Question 20

Fill in the blank: The primary sugar produced during photosynthesis is _____ .

Answer 20

glucose

Question 21

What is the role of ATP in photosynthesis?

Answer 21

ATP provides energy for the light-independent reactions of photosynthesis.

Question 22

Multiple Choice: Which of the following is NOT a product of photosynthesis? A) Oxygen B) Glucose C) Nitrogen

Answer 22

C) Nitrogen

Question 23

True or False: The oxygen released during photosynthesis comes from carbon dioxide.

Answer 23

False (it comes from water)

Question 24

Short Answer: What is the significance of photosynthesis for life on Earth?

Answer 24

Photosynthesis produces oxygen and organic compounds that are essential for the survival of most life forms.

Question 25

Epidermis

Answer 25

Transparent waxy curticle= allow sunlight to penetrate into palisade mesophyll Stomata= gaseous exchange with the presence of light

Question 26

Palisade mesophyll

Answer 26

Packed with chloroplast= enable sunlight to be absorb at a maximum rate

Question 27

Spongy mesophyll

Answer 27

Contain air spaces= allow efficient gaseous exchanged during photosynthesis

Question 28

Xylem

Answer 28

Transport water and mineral salts from root to the leaves

Question 29

Phloem

Answer 29

Transport glucose produde by photosynthesis from leaf to all parts of the plants

Question 30

Thylakoid

Answer 30

Disc-shaped contain chlorophyll=have photosynthetic pigment to trap sunlight

Question 31

Granum

Answer 31

A disc-shaped stack with thylakoid= increase the surface area for optimal photosynthesis

Question 32

stroma

Answer 32

Colorless fluid surrounding granum

Question 33

Lamellae

Answer 33

Thin membrane structure that connect granum to other granum.

Question 34

Light-Dependent Reaction

Answer 34

Requires Light Takes place in the thylakoid membrane. Uses light energy to excite electrons in chlorophyll. Photolysis of water produces O₂, H⁺, and electrons.

Question 35

Light-Independent Reaction

Answer 35

Does NOT Require Light Takes place in the stroma of the chloroplast. Uses ATP and NADPH from the light-dependent reactions.

Question 36

Both light dependent and independent reaction

Answer 36

catalysed by enzyme take place in chloroplast

Question 37

The higher the carbon dioxide concentration?

Answer 37

The higher the rate of photosynthesis

Question 38

The higher the light intensity without limiting factors?

Answer 38

The higher the rate of photosynthesis (max til noon)

Question 39

The higher the temperature?

Answer 39

Denatures the enzymes thus, photosynthesis is stopped

Question 40

which colour is the highest?

Answer 40

Red= absorbed by chlorophyll Blue=absorb by carotenoid pigment before transfer to chlorophyll