Ch.7.3

Question 1

All our body activities require ________________, which is obtained from the ___________________________.

Answer 1

energy, food we eat

Question 2

The _____________ energy stored in food can be converted into other useful forms of energy to ________________________________________, eg _______________ energy for __________________________________
_______________ energy ________________________ and
_________________ energy ________________________________.

Answer 2

chemical, support our body activities, thermal, keeping us warm, sound, when we sing, kinetic, wen we exercise

Question 3

_________________ is the source of energy for all living things.

Answer 3

Food

Question 4

When food is burned in air, ___________________________________.

Answer 4

energy is released

Question 5

What is respiration?

Answer 5

The process of the chemical energy in food being converted into other useful forms.

Question 6

Respiration is a ________________ process involving many _______________________________.

Answer 6

complex, chemical reactions

Question 7

Respiration takes place in ________________________________.

Answer 7

our body cells

Question 8

During respiration, cells use oxygen to ________________________________________________________.

Answer 8

break down food to release energy in useful forms

Question 9

What are the products of respiration?

Answer 9

carbon dioxide and water.

Question 10

What is the food broken down in respiration?

Answer 10

Glucose.

Question 11

What is the word equation of respiration?

Answer 11

glucose + oxygen ___energy released___> carbon dioxide + water

Question 12

What is the chemical equation of respiration?

Answer 12

C₆H₁₂O₆+6O₂___energy released___>6CO₂+6H₂O

Question 13

What do plants need energy for?

• to ______________
• to __________________________
• to ________________

Answer 13

grow, repair tissue, reproduce

Question 14

Why do plants also carry out respiration?

Answer 14

To release the energy from the food they produced.

Question 15

What can we see from the equations of photosynthesis and respiration?

• the products of photosynthesis…
• on the other hand, the products of respiration…
• during photosynthesis…
• the food…

Answer 15

(glucose and oxygen) are the raw materials for photosynthesis
(carbon dioxide and water) are the raw materials for photosynthesis

light energy is converted into chemical energy in food
is broken down in respiration to release energy

Question 16

Where does photosynthesis/ respiration take place?

Answer 16

green parts of plants with chlorophyll/ in both plants and animals

Question 17

What is the difference between the part that energy plays in photosynthesis/ respiration?

Answer 17

energy is stored in food; energy is released in food.

Question 18

When does photosynthesis/ respiration take place?

Answer 18

Under the presence of light/ daytime; all the time

Question 19

What are the five factors that differentiate photosynthesis from respiration?

Answer 19

raw materials, products, where it takes place, when it takes place, energy