Unit 1 Photosynthesis

Question 1

Life processes :

Answer 1

Movement
Respiration
Sensitivity
Control
Growth
Reproduction
Excretion
Nutrition

Question 2

Define photosynthesis :

Answer 2

Photosynthesis is the process of when plants make food in the presence of light energy, carbon dioxide and water.

Question 3

Equation of photosynthesis :

Answer 3

carbon dioxide + water —sunlight and chlorophyll——> glucose + oxygen

Question 4

Chemical equation :

Answer 4

6CO2 + 6H20 ——-sunlight and chlorophyll —-> C6H1206 + 602

Question 5

Autotrophs :

Answer 5

Autotrophs are independent and make their own food.

Question 6

What are the raw materials needed by the plants to make food?
From where do the plants obtain them?

Answer 6

Sunlight - Sun
Water - Soil
Carbon dioxide - Air

Question 7

What are the products of photosynthesis?
What is the important product and what is the byproduct?

Answer 7

The products are oxygen and glucose. The main product is glucose and the byproduct is oxygen.

Question 8

Where do plants get their energy?

Answer 8

Sunlight

Question 9

Which part in the plant cell absorb the above energy?

Answer 9

Chloroplast

Question 10

What is a photomicrograph?

Answer 10

A picture that you can see under the microscope.

Question 11

What is the green pigment in the leaf called?

Answer 11

Chlorophyll

Question 12

Waxy cuticle :

Answer 12

It is made of wax - waterproofing the leaf.

Question 13

Upper epidermas :

Answer 13

. It is a thin and transparent which allows light to pass through.
. No chloroplast is present

Question 14

Palisade mesophyll :

Answer 14

. Main region for photosynthesis
. Cells are tightly packed which allows it to trap chloroplast.

Question 15

Spongy mesophyll :

Answer 15

.Cells are more irregular shape and loosely packed.
.It contains chloroplast but not as many in the palisade cells.

Question 16

Vascular bundle :

Answer 16

.This is a leaf vein, made up of xylem and phloem.

Question 17

What do xylem vessels transport?

Answer 17

They transport water and minerals to the leaf.

Question 18

What do phloem vessels transport?

Answer 18

They transport sugar and amino acids away from the leaf.

Question 19

Lower epidermas :

Answer 19

Acts as a protective layer.

Question 20

Stomata :

Answer 20

. Each stomata is surrounded by a pair of guard cells.

Question 21

Guard cells :

Answer 21

They control the stomata to open or close.

Question 22

How is the palisade layer adapted to max photosynthesis?

Answer 22

. Cells are tightly packed meaning minimal space for light energy.
. Cells are at the top.
. Large surface area and a lot chloroplast for photosynthesis.

Question 23

Explain the adaptations of the spongy mesophyll cells for photosynthesis.

Answer 23

They spongy mesophyll sells are loosely packed and in a irragular shape. Therefore there are air spaces. This allows CO2 to reach to the leaf and O2 to leave out.