Biology 4-6

Question 1

Equation to remember Chemical elements

Answer 1

CHO, CHO, CHON

Question 2

Chemical elements that make up carbohydrates

Answer 2

Carbon, oxygen and hydrogen

Question 3

Chemical elements that make up fats (lipids)

Answer 3

Carbon, oxygen, hydrogen

Question 4

Chemical elements that make up proteins

Answer 4

Carbon, oxygen, hydrogen and nitrogen

Question 5

State the larger molecules that makes up starch

Answer 5

Starch, glycogen and cellulose from glucose

Question 6

State the larger molecules that makes up proteins

Answer 6

Proteins from amino acids

Question 7

State the larger molecules that makes up fats

Answer 7

Fats and oils from fatty acids and glycerol

Question 8

Iodine solution test is for

Answer 8

Starch

Question 9

Positive result for Iodine test

Answer 9

blue-black

Question 10

Negative result for Iodine test

Answer 10

stays orange-yellow

Question 11

Benedict’s solution test is for

Answer 11

Reducing sugars

Question 12

Positive result for Benedict’s soluction

Answer 12

orange-brick red

Question 13

Negative result for Benedict’s soluction

Answer 13

stays blue-green

Question 14

Biuret test is for

Answer 14

proteins

Question 15

Positive result for Biuret test

Answer 15

purple

Question 16

Negative result for Biuret test

Answer 16

stays blue

Question 17

Ethanol emulsion test is for

Answer 17

fats and oils

Question 18

Positive result for Ethanol emulsion test

Answer 18

white-cloudy

Question 19

Negative result for Ethanol emulsion test

Answer 19

stays colourless

Question 20

Define enzymes

Answer 20

Proteins that are involved in all metabolic reactions, where they function as biological catalysts

Question 21

What is meant by biological catalysts

Answer 21

A substance that speed up a chemical reaction

Question 22

Most enzyme names end with

Answer 22

ASE

Question 23

What is meant by optimum temperature

Answer 23

Where a maximal rate of reaction is achieved

Question 24

What is photosynthesis

Answer 24

The process by which plants synthesise carbohydrates from raw materials using energy from light

Question 25

Word equation for photosynthesis

Answer 25

carbon dioxide + water → light & chlorophyll → glucose + oxygen

Question 26

What is Chlorophyll

Answer 26

A green pigment that is found in chloroplasts

Question 27

What is the need of chlorophyll for photosynthesis

Answer 27

Chlorophyll absorb light so it can carry out photosynthesis.

Question 28

What is the need of light for photosynthesis

Answer 28

Light provides energy for the process

Question 29

What is the need of carbon dioxide for photosynthesis

Answer 29

Carbon dioxide provides the carbon atoms that are used to make glucose

Question 30

Structure of leaves

Answer 30

Leaves have a large surface area and are thin

Question 31

How the features of the structure of leaves are adaptations for photosynthesis

Answer 31

Leaves are wide and flat to create a large surface area and to absorb as much light as possible Leaves are thin so gases can reach cells easily

Question 32

Structure of a plant (11)

Answer 32

Chloroplasts Cuticle Guard cells Stomata Upper and lower epidermis Palisade mesophyll Spongy mesophyll Air spaces Vascular bundles Xylem Phloem

Question 33

How are leaves adapted for diffusion (2/3)

Answer 33

Leaves are thin. This decreases the distance gases have to travel between the air and cells. There are air spaces between cells. This increases the speed of diffusion from the air to the cells inside the leaf. There are lots of stomata on the undersides of leaves