Photosynthesis

Question 1

What drives life on Earth and in ecosystems?

Answer 1

✨energy✨

Question 2

Fill in the blank.

The Sun provides energy to ecosystems in the form of _______ and ______.

Answer 2

light & heat

Question 3

The suns energy warms the… (5)

Answer 3

• Air
• Soil
• Water
• Plants
• Animals

Question 4

Plants use the sun’s ______ _____ to produce _____ through photosynthesis.

Answer 4

light energy, food.

Question 5

Name the seven life processes. (MRS GREN)

Answer 5

M- Movement
R- Respiration
S- Sensitivity

G- Growth
R- Reproduction
E- Excretion
N- Nutrition

Question 6

What is the role of plants in ecosystems? Explain the process of photosynthesis.

Answer 6

• Chemical process during which green plants use the energy in sunlight to convert water and carbon dioxide into glucose.
• During photosynthesis CO2 and H2O react to form glucose and oxygen. Chlorophyl and sunlight is needed for the reaction to occur.

Question 7

Where does photosynthesis take place?

Answer 7

In chloroplasts.
Photosynthesis takes place in small organelles called chloroplasts. Chloroplasts contain a green pigment called chlorophyl, which…
- Gives plants their green color
- absorbs light energy needed to make photosynthesis
- plant and algae can only carry out photosynthesis in the light.

Question 8

What are requirements for photosynthesis? What does each requirement do?

Answer 8

~Carbon dioxide gas -> absorbed from the air through a small opening on the surface of the leaves.
~Water -> absorbed from the soil and moves from the roots to the leaves.
~Sunlight -> provides energy
~Chlorophyl -> absorbs sunlight energy.

Question 9

What are the products of photosynthesis?

Answer 9

~Glucose -> type of sugar molecule, food for animals

~Oxygen -> released into the air, breathed in by animals

Question 10

What is the MAIN product of photosynthesis?

Answer 10

Glucose.

Question 11

What is the by-product of photosynthesis?

Answer 11

Oxygen.

Question 12

What happens to the main product of photosynthesis?

Answer 12

Some of the glucose is broken down to release energy. The rest of the glucose is changed into compounds- sucrose, starch, and cellulose.

Question 13

What is sucrose?

Answer 13

Sucrose is a compound formed by glucose. It consists of 2 sugar molecules joined together. This is the form in which sugar is transported from one part of the plant to another.

Question 14

What is starch?

Answer 14

Starch is a compound formed by glucose. It consists of a long chain of molecules joined together. This is the main form in which plants store energy.

Question 15

What is cellulose?

Answer 15

Cellulose is a compound formed by glucose. It is made up of linear chains of sugars. Cellulose provides structure and support to plants.

Question 16

What’s the difference between autotrophs and heterotrophs?

Answer 16

Plants make their own food, so they are called Autotrophs.

Organisms that cannot make food and have to consume food, are called Heterotrophs.

Question 17

Provide information about Heterotrophs.

Answer 17

• They need to eat regularly to survive.

- They break the food down into glucose which is used by their body.

Question 18

What is photosynthesis?

Answer 18

The process in which plants use sunlight, chlorophyl, carbon dioxide and water to make their own food. This food is glucose. A by-product of photosynthesis is oxygen.

Question 19

What is the biological importance of photosynthesis for our ecosystem?

Answer 19

• > it makes glucose which all animals eat

- > it makes oxygen which all animals need for cellular respiration.

Question 20

The sugars that are produced during this process are transformed into other chemical compounds. Name these compounds.

Answer 20

Starch- stores chemical energy
Sucrose- molecule used to transport sugars
Cellulose- gives plants structural support.

Question 21

Explain what happens to a plant at night.

Answer 21

It undergoes cellular respiration- so it converts glucose into energy.

Question 22

Write out a word equation for the process of photosynthesis.

Answer 22

through sunlight & chlorophyl
^
Water + Carbon dioxide —-|—>
Glucose + Oxygen

Question 23

What is the pigment that gives the plant a green colour?

Answer 23

Chlorophyll