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Enzymes, Digestive System, Plant Nutrition &Photosynthesis

Total questions: 66

Worksheet time: 48mins

Name
Class
Date
1.

Where in a plant cell does photosynthesis take place

a)

Palisade cells

b)

Chlorophyll

c)

Chloroplasts

d)

Mitochondria

2.

What is the purpose of photosynthesis?

a)

To release energy from glycogen

b)

To produce glucose and oxygen

c)

To ensure plant growth

d)

To get oxygen for respiration

3.

Which of these are limiting factors for photosynthesis? Choose 3 options.

a)

Light intensity

b)

CO2 concentration

c)

Temperature

d)

Oxygen concentration

e)

pH level

4.

Which tissue in a leaf does the majority of photosynthesis?

a)

Upper epidermis

b)

Spongy mesophyll

c)

Palisade mesophyll

d)

Stomata

5.

Which of these are suitable ways to measure the rate of photosynthesis? Choose 2 answers.

a)

Measure amount of carbon dioxide produced

b)

Measure amount of oxygen produced

c)

Measure pH change

d)

Check for starch presence with iodine

6.

Which wavelengths of light does chlorophyll absorb?

a)

Green

b)

All visible light

c)

Red and blue light

d)

It reflects all light

7.

What is limiting the rate of photosynthesis at point B?

a)

CO2 concentration or temperature

b)

No any limiting factors

c)

Light intensity

d)

Surface area of leaf

8.

Which factors must be kept constant when investigating the effect of light intensity on photosynthesis? Choose 3 answers.

a)

Mass of pond weed

b)

Species of pond weed

c)

Light intensity

d)

Temperature

e)

Size of test tube

9.

Which mineral ion is needed by a plant in order to build chlorophyll?

a)

Calcium

b)

Nitrates

c)

Magnesium

d)

Phosphorous

10.

Which of these is the correct equation for photosynthesis?

a)

6O2 + C6H12O6 --> 6CO2 + 6H2O

b)

6O2 + 6CO2 --> C6H12O6 + 6H2O

c)

6CO2 + 6H2O --> 6O2 + C6H12O6

d)

6CO2 + 6H2O --> O2 + C6H12O6

11.

What are the products of photosynthesis?

a)

Oxygen and Energy

b)

Carbon Dioxide and Glucose

c)

Glucose and Oxygen

d)

Oxygen and Water

12.

When testing a leaf for starch why is it necessary to boil it in ethanol first?

a)

To break open the plant cells

b)

To release the starch form the cells

c)

To kill the plant cells

d)

To remove the chlorophyll from the leaf

13.

A student wanted to see if covering a leaf in foil would stop it from producing starch. Why should the student put the plant in a dark cupboard for 48 hours before returning it to the light and starting the experiment?

a)

To make the results reliable

b)

So that the plant would photosynthesise faster when returned to the light

c)

So that any starch already in the leaf was used up by the plant

14.

Why might photosynthesis slow down or stop at high temperatures? Choose 2 answers.

a)

Enzymes denature

b)

Chlorophyll denatures

c)

The plant wilts

d)

Stomata close so no CO2 can enter the leaf

15.

Why does hydrogen carbonate indicator change colour if a photosynthesising plant is present? Choose 2 answers.

a)

O2 is produced by the plant

b)

CO2 is absorbed by the plant

c)

Higher dissolved O2 lowers the pH

d)

Lower dissolved CO2 levels raises the pH

e)

Lower dissolved CO2 levels lowers the pH

16.

Why does a plant need nitrates from the soil? Choose the best answer.

a)

To make glucose

b)

To make amino acids

c)

For growth

d)

Because it is a mineral

17.

Pond weed is placed in hydrogen carbonate indicator. After 60 minutes the indicator colour has not changed. Why?

a)

No photosynthesis is occurring

b)

It is night time

c)

The rates of respiration and photosynthesis are equal

d)

The indicator is already saturated with CO2

18.

Which is a definition for photosynthesis?

a)

Releasing energy from nutrients

b)

The breaking down of large insoluble molecules into small soluble molecules

c)

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

d)

The movement of particles from a high concentration to a low concentration

19.

What structures are found in the vascular bundle? (pick 2 options)

a)

Xylem

b)

Phloem

c)

Palisade mesophyll

d)

Spongy mesophyll

20.

What is the role of stomata?

a)

Openings in the leaf that allows gas in and out of the plant

b)

Transports water and supports the plant

c)

transports sugars

d)

Where photosynthesis happens

21.

What does the plant need magnesium for?

a)

For the production of chlorophyll

b)

For the production of amino acids

c)

For the production of glucose

d)

For the production of starch

22.

What is the role of the spongy mesophyl?

a)

It allows gas to move through the leaf

b)

It transports water

c)

It transports sugars

d)

It is where photosynthesis happens

23.
Which of the following statements about xylem is INCORRECT? 
a)
It conducts material from root tips to leaves. 
b)
The conducting cells are part of the apoplast. 
c)
It transports mainly sugars and amino acids. 
d)
No energy input is required for transport.
24.
Enzymes are considered to be 
a)
Lipids
b)
Carbohydrate
c)
Protein
d)
Nucleic Acid
25.
What is the purpose  of an enzyme?
a)
give permission for the reaction
b)
raise activation energy
c)
speed up reactions
d)
control how many reactions occur
26.
Where do substrates bind on an enzyme?
a)
voltage-gated channels
b)
surface receptor
c)
calcium channels
d)
active site
27.
What happens when enzymes are heated to a high temperature?
a)

The enzymes are inactive.

b)

Enzyme active site are altered or denatured

c)
The enzymes' amino acid sequence changes.
d)
The enzymes remain the same
28.
What happens to an enzyme when it is denatured?
a)
Activation energy is lowered.
b)
It becomes stronger.
c)
It loses its shape.
d)
Activation energy is raised.
29.
Which factors can change the shape of an enzyme and thus denatures a enzyme?
a)
Excessive heat and changes in pH
b)
Nothing can
c)

Exposure to light and carbon dioxide

d)
Exposure to bacteria and Amoebas
30.
Based on the graph, what temperature does this enzyme work best? 
a)
15 C
b)
40 C
c)
30 C
d)
47 C
31.
Which of the following conclusions can be drawn from this graph?
a)
The optimum pH of the enzyme is 6.6.
b)
The optimum pH of the enzyme is 5.8
c)
The enzyme’s activity increases as pH increases 5.0 to 9.0
d)
The enzyme’s activity is greater around pH of 8.0 .
32.
The graph shows the relative rates of action of four enzymes, A, B, C, and D. Which enzyme shows the greatest change in its rate of action with the least change in pH?
a)
enzyme A 
b)
enzyme B 
c)
enzyme C
d)
enzyme D
33.

Which molecule would most likely react with the enzyme?

a)

A

b)

B

c)

C

d)

D

34.

What process is shown in the diagram?

a)

Digestion

b)

Synthesis

c)

Replication

d)

Reproduction

35.

Enzymes in your body probably work best at which of the following temperatures>

a)

25oC

b)

98oC

c)

37oC

d)

210oC

36.
Where do substrates bind on an enzyme?
a)
voltage-gated channels
b)
surface receptor
c)
calcium channels
d)
active site
37.
Enzymes will make a reaction go _______ and use ______ energy.
a)
faster, less
b)
faster, more
c)
slower, less
d)
slower, more
38.
Cells can produce over one thousand different enzymes at a time.  Enzymes are critical to the metabolism of these cells, but why are so many different enzymes needed?
a)
Cells are completely unable to control what enzymes
they produce
b)
The variety of enzymes prevents their actions from being inhibited. 
c)
The active site of an enzyme can only bind to a specific substrate.
d)
The products of a reaction are always converted into new enzymes.
39.

What is a characteristic of all catalysts?

a)

They are enzymes.

b)

They are proteins.

c)

They speed up chemical reactions.

d)

They work in living organisms.

40.

Which substances do root hairs take from the soil?

a)

water and mineral ions

b)

water and carbon dioxide

c)

carbon dioxide, oxygen and mineral ions

d)

carbon dioxide, oxygen and water

41.

Which condition can sometimes be prevented by eating plenty of fresh fruit and vegetables?

a)

bleeding gums

b)

brittle bones

c)

diabetes

d)

soft bones

42.

Lock is the _________ in lock and key hypothesis.

a)

enzyme

b)

substrate

c)

active site

d)

enzyme-substrate complex

43.

What is the function of chlorophyll?

a)

To store raw materials for photosynthesis

b)

To store magnesium ions

c)

To release energy from carbohydrates

d)

To convert light energy to chemical energy

44.

What are enzymes?

a)

Fats that have a characteristic molecular shape

b)

Fats that are secreted by glands in the digestive system

c)

 Proteins that are unaffected by temperature

d)

Proteins that act as biological catalysts

45.

Starch produced during photosynthesis can be detected by which solution?

a)

Iodine

b)

Benedict

c)

Biuret

d)

DCPIP

46.

Where is lipase produced, and into which part of the intestine is it secreted?

a)

Produced by liver

Secreted to ileum

b)

Produced by pancreas

Secreted to ileum

c)

Produced by pancreas

Secreted to duodenum

d)

Produced by liver

Secreted to duodenum

47.

Which substance catalyses the breakdown of fats to fatty acids and glycerol?

a)

pepsin

b)

protease

c)

lipase

d)

bile

48.

Which part of the tooth is known as the toughest substance in the human body?

a)

Dentine

b)

Cementum

c)

Enamel

d)

Jaw bone

49.

Which teeth are used for tearing food?

a)

Incisors

b)

Canines

c)

Molars

d)

Premolars

50.

Which type of teeth are used to cut and bite food?

a)

Molars

b)

Canines

c)

Premolars

d)

Incisors

51.

The teeth is used to carry out which type of digestion

a)

Chemical

b)

Mechanical

c)

Both chemical and Mechanical

d)

None of the above

52.

What is often added to water and tooth paste to improve the quality of peoples teeth.

a)

Whitening agents

b)

Water

c)

Fluoride

d)

Chlorine

53.

How many teeth are there in the human body

a)

33

b)

34

c)

32

d)

43

54.
Where in the body would HCl be found?
a)
Mouth
b)
Esophagus
c)
Liver
d)
Stomach
55.

__________________ converts fats to emulsified fats

a)

Bile juice

b)

Pancreatic juice

c)

Gastric juice

d)

Orange juice

56.
Muscular tube that connects the mouth to the stomach
a)
Epiglottis
b)
Peristalsis
c)
Stomach
d)
Esophagus
57.
What is another name for enzymes?
a)
chemical catalyst
b)
microorganism
c)
biological catalyst
d)
catalyst
58.

What is the process of wave-like muscle contractions that moves food through the digestive tract?

a)

Pericardium

b)

Peristalsis

c)

Pepsin

d)

Pericoronitis

59.

Where does absorption primarily take place?

a)

Stomach

b)

Small intestine

c)

Large intestine

d)

Gall bladder

60.

Where is bile produced?

a)

Kidney

b)

Pancreas

c)

Liver

d)

Small intestine

61.

What is the term given to a ball-like mixture of food and saliva that forms in the mouth?

a)

Peristalsis

b)

Mucus

c)

Epiglottis

d)

Bolus

62.

What is the acidic fluid that passes from the stomach following churning?

a)

Bolus

b)

Chyme

c)

Hydrochloric acid

d)

Enzymes

63.

What are these structures call that are found on the lining of the small intestine?

a)

Gallbladder

b)

Villi

c)

Sphincter

d)

Duodenum

64.
As waste moves through the digestive system, the ______ absorbs water before storing waste in the rectum.
a)
Small intestine
b)
Stomach
c)
Esophagus
d)
Large intestine
65.

A short tube at the end of the large intestine that stores solid waste is the...

a)

stomach

b)

rectum

c)

liver

66.
Where nutrients go after the small intestine has absorbed them.
a)
bloodstream
b)
stomach
c)
esophagus
d)
kidneys

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