T1 Photosynthesis and respiration

Question 1

Define interdependent

Answer 1

Two or more things depend or rely on each other

Question 2

What is the most important way that organisms interact?

Answer 2

In their search for energy or food

Question 3

Define radiant energy

Answer 3

Energy contained in electromagnetic radiation

Question 4

What is the ultimate source of energy?

Answer 4

The sun

Question 5

Define photosynthesis

Answer 5

Radiation energy is converted into potential energy which is stored in food and oxygen is released

Question 6

Can organisms use the radiant energy from the sun directly?

Answer 6

No. The energy must be changed into a form that can be used

Question 7

Can energy be destroyed?

Answer 7

No, but it can be converted from one form into another.

Question 8

Define chemical reactions

Answer 8

Chemical changes that take place when two or more compounds react and form new substances

Question 9

What are cells?

Answer 9

The smallest units of living organisms

Question 10

What is chlorophyll?

Answer 10

Green pigment in plant cells that absorbs radiant energy

Question 11

What is potential energy?

Answer 11

Energy that is stored in an object or system

Question 12

What does the word photosynthesis mean?

Answer 12

Photo = light, synthesis = to make. Plants make food in a series of chemical reactions

Question 13

What do plants require in order to photosynthesise?

Answer 13

Sunlight
Water
Carbon dioxide

Question 14

How do plants absorb carbon dioxide?

Answer 14

Through their leaves

Question 15

What product do plants produce from sunlight and water using radiant energy?

Answer 15

Glucose

Question 16

What is glucose?

Answer 16

A simple sugar that a plant uses for food

Question 17

What waste product forms as a result of photosynthesis?

Answer 17

Oxygen

Question 18

What type of energy is found in glucose?

Answer 18

Potential energy. When animals eat plants, they consume the energy that the plants have made during photosynthesis

Question 19

What other chemical compounds do plants change glucose into?

Answer 19

Starch

Cellulose

Question 20

Name four examples of starch stored in plants

Answer 20

Apples, potatoes, rice and carrots

Question 21

Many glucose molecules joined together to form…

Answer 21

Starch

Question 22

What is cellulose?

Answer 22

Part of the cell wall of plant cells. A structural material that provides clients with support — the reason trees can grow so tall.

Question 23

The sugars that are produced during photosynthesis transformed into other chemical compounds. Give the names and functions of two examples of these chemical compounds

Answer 23

Starch. Stored for energy

Cellulose. A structural material that provides plants with support

Question 24

Write down the word equation photosynthesis

Answer 24

chlorophyll
Carbon dioxide + water ——– > glucose + oxygen
sunlight