Plant Respiration BIOLOGY FORM 4

7/28/2019 Plant Respiration BIOLOGY FORM 4

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14. PLANTBIOLOGY


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Unit 2.6 : Understanding respiration in plants.

Learning Outcome:A students is able to:

1.Describe theenergy

requirement inplants.

2.Explain theintake of oxygenfor respiration.

3.Explain aerobicrespiration in

plants.

4.Explain anaerobicrespiration in plants

under certainconditions.


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Unit 2.6 : Understanding respiration in plants.

Learning Outcome:A students is able to:

5.Compare andcontrast the process

of photosynthesis

and respiration.

7.Explain whatcompensation point is.

6.Relate the lightintensity with the

compensation point.

8.Predict the situationwhen the rate of

photosynthesis and rateof respiration remains at

compensation point.


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Prior Knowledge:Students already know about:

What is needed for respiration.Products of respiration.Aerobic and anaerobic respiration.Photosynthesis.


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THINK IT !

1. Does the plant have respiration ?. If yes, namethe types of respiration?

2. What substances require to the plantsrespiration?

3. State the name of the respiration gaseous ?

4. How the gaseous diffused to the plant?5. Why plants need the respiration process?


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Respiration in plants

Explain The intakeof O 2 by plants for

respiration

Breakdownglucose to

CO 2, H 2O andenergy

Take in O 2

Presence of O 2

Throughstomata &lenticels

Aerobic respirationDescribe EnergyRequirement in

plants

By diffusion

Respiration stilloccurs because

plants needenergy

Part: leaves,

stems and roots


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Respiration in plants

Comparison withphotosynthesi s

Without O 2 Similarities

Differences

Predictsituation

Relation withlight intensity

Point of equilibrium

Compensation pointAnaerobicrespiration


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STATE THE IMPORTANCE OF THE ENERGY INPLANTS.

a. Active transport b. Photosynthesis c. Growth d. Reproduction


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2.EXPLAIN THE INTAKE OF O 2 BYPLANTS FOR RESPIRATION

Figure 8.51(a) shows the stem structure in the old plants and

figure 8.51(b) shows common structure in the leaf. Bothstructures included in respiration process . Observe figure8.51(a) and 8.51(b). Try to label it!


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2.EXPLAIN THE INTAKE OF O 2 BYPLANTS FOR RESPIRATIONDEFINE THE STRUCTURE

a) Name :Characteristic :

Function :

b) Name :Characteristic

Function :


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DEFINE THE STRUCTURE

a) Name : stoma

Characteristic : Consist of poressurrounded by guard cell.

Function : Respiratory gaseous enter andleave plants via the stomata.

b) Name : lenticelsCharacteristic : Pores found on the stemsand roots of plant. Cells around thelenticels arranged loosely to allow thegas diffusion.

Function : Allow diffusion of the gaseous


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2.EXPLAIN THE INTAKE OF OXYGEN FORRESPIRATION.

Label to showthe pathway of gaseousexchange in aleaf

Explain theprocessinvolving theexchange of O2 and CO2for the part P,Q, R.


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2.EXPLAIN THE INTAKE OF OXYGEN FORRESPIRATION.

Oxygen diffuse through the plants into thecells.

Nucleus

Or anelle M

Vacuole


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2.EXPLAIN THE INTAKE OF OXYGENFOR RESPIRATION.

Figure 8.53 shows a plant cell. Base on the figure 8.53

1. Suggest how oxygen is used in M organelle?In the presence of oxygen, glucose is oxidized to releaseenergy,carbon dioxide and water 2. State the equation (chemical) of the process occurs in the M

organelle.C 6 H 12 O6 + 6O2 ------------- 6 CO2 + 6 H 2 O + energy 3.State the uses of the product from that process for plants.Carbon dioxide and water is the reactants for photosynthesis in the plants.


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EXPLORING FURTHER!!!

The stomata of leaves are closed at night. Howdo plant cell carry out aerobic respiration at

night?


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3.EXPLAIN AEROBIC AND ANAEROBICRESPIRATION IN PLANTS

Base on the above statement, explain the inference Plants cells do carry out both aerobic and anaerobic

respiration . ii. Write down the reaction equation of the process

occurs in the root cell in the waterlogged condition. C

6 H

12 O

6 ------------- 2C

2 H

5 OH + 2 CO

2 + energy

Crops like corn could live several hours in mud. The root of soy beans could live within 30 minutes only in anaerobiccondition. The crops like paddy could live in the waterlogged.


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3.EXPLAIN AEROBIC AND ANAEROBICRESPIRATION IN PLANTS

Figure 7 shows a cluster of paddyplants in a paddy field.

(a) Referring to Figure 7, explain the

process of respiration which occurs inthe

(i) leaves

(ii) roots

[4 marks]


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TRIAL 2004 Leaves F1 F2 Roots F3 E1 F4


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4.COMPARE AND CONTRAST THE PROCESSOF PHOTOSYNTHESIS AND RESPIRATION.

Similarities

Both occur in living cells. Both processes involve a series of enzyme reactions. Both processes involve in maintaining the balance of

oxygen and carbon dioxide in the air.

Both processes involve changes in chemical energy inorganic substances


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2 : TRIAL 2005 a) Process P and Q.

Process P is photosynthesis

Process Q is respiration. .


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5.RELATE LIGHT INTENSITY WITH COMPENSATIONPOINT


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COMPENSATION POINT

D: The rate of photosynthesis is equal to the rate of respiration

E1: The Carbon dioxide released from respiration isequivalent to the Carbon dioxide used up duringphotosynthesis.

E2: The oxygen produced during photosynthesis is used upfor respiration.

E3: The exchange of gaseous is at equilibrium E4: No net gain or loss in the sugar production. S: the growth, reproduction, and seed production are

impossible in plants


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5.RELATE LIGHT INTENSITY WITH COMPENSATION POIN Phase I F : As the light intensity increases, the rate of photosynthesis alsoincreases. E : Oxygen is absorbed and CO2 is released during cellular respiration.

Phase II F : Light attains a particular intensity at which the rate of respiration is

balanced by the rate of photosynthesis. (COMPENSATION POINT)

E 1 : Plant experiences no gain or loss of O 2 or CO 2 to the atmosphere E 2 : The rate sugar usage is the same as the rate of sugar production

Phase III F : As the light intensity continue to increase during the day, rate of

photosynthesis is higher than the rate of respiration E1 : All CO2 produced during respiration are used by the plants cells for

photosynthesis. The plant must now take in CO2 from the atmosphere tosupplement the need for a higher requirement of CO2

E2 : The excess oxygen produced from photosynthesis diffuses from the plant to

the surrounding environment.


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6.PREDICT THE SITUATION WHEN THE RATE OFPHOTOSYNTHESIS AND RATE OF RESPIRATION REMAINS ATCOMPENSATION POINT.

The growth, reproduction, and seed production are impossible in plants. How to overcome??

-the rate of photosynthesis must exceed the rate of respiration on adaily basis.

-this enables the rate of sugar production to exceed the rate of sugar consumption.

-therefore, the excess sugar can be used for growth and other vital livingprocesses in plants.

- at the same time, the excess O2 produced during photosynthesis isreleased into the atmosphere to sustain living things.


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ANSWER SCHEME In boiling tube Q F1 Photosynthesis takes place because light intensity is high in Q. E1 Less CO2 dissolved in the hydrogen bicarbonate indicator.

E2 The colour of hydrogen bicarbonate indicator change to purple.

In boiling tube R F1 Leaf does both photosynthesis and respiration // Leaf receive

medium light intensity. E4 The quantity of CO2 produced by photosynthesis is the same as

the CO2 used by the leaf for respiration. E5 The colour of hydrogen bicarbonate indicator remains the same.


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(a)(i) Explain what happen at point P.[ 4 marks ]

(ii) If the plant is put in a green house where the light intensity is controlled atoptimum level along the day, explain the effect to point P.

Ji ka tumbuh an dil etak dalam rumah hi j au di mana keamatan cahaya dik awal pada aras optimu m sepanj ang har i , ter angkan kesan ke atas ti ti k P. [6 marks ]


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ANSWER SCHEME (A)(I) Able to explain what happen to point P F1 : P is compensation point E1 : no net gain or loss in carbon dioxide E2 : no net gain or loss in the sugar produced E3 : where the light intensity at which the rate of carbon dioxide

produce(during respiration)

E4 : equal to carbon dioxide consumption(duringphotosynthesis)


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ANSWER SCHEME (A) (II) Able to explain the effect to point P F1 : point P isnot exist E1 : the rate of photosynthesis is higher at optimum level of light

intensity E2 : compare to the rate of respiration E3 : carbon dioxide from respiration is used for photosynthesis

E4 : consumption of carbon dioxide during photosynthesis ishigher along the day E5 : no point where the produced of carbon dioxide is equal to

the consumption of carbon dioxide

Plant Respiration BIOLOGY FORM 4

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