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WorksheetsGASEOUS EXCHANGE
Total questions: 20
Worksheet time: 39mins
Structure of hemoglobin :
conjugated protein
tertiary structure
consist of 4 subunits of polypeptide bond
consist of 4 subunits of polynucleotide
Why hemoglobin can react as respiratory pigment?
high affinity toward CO2
high affinity to O2
can easily release O2 when Po2 is low at lung
can easily release O2 when Po2 is low at tissue
How many oxygen gas combine with hemoglobin?
(a)
choose the correct answers about alveolus
surrounded by numerous blood capillary
large surface area foe gaseous exchange
thin simple cuboidal epithelium cell
moist surface of a alveoli
what happen to oxygen dissociation curve (ODC) if Pco2 increase at tissue?
(a)
what happen to the oxygen dissociation curve (ODC) if Po2 increase at lung?
(a)
what happen to the hemoglobin when Po2 increase at lung?
affinity to oxygen high
forming oxyhemoglobin
release oxygen
affinity to oxygen low
Oxyhaemoglobin gives up O2 when …
CO2 concentrations are high.
Body temperature is lowered.
pH values are high.
O2 concentrations are higher.
When chemoreceptors detect a slight decrease in pH, this means that _______________ concentrations have increased, and the breathing rate must ________________ .
Carbon dioxide; increase.
Carbon dioxide; decrease.
Oxygen; increase.
Oxygen; decrease.
Each haemoglobin molecule can bind reversibly with
one atom of oxygen
one molecule of oxygen
two molecules of oxygen
four molecules of oxygen
which of the following leads to stomatal closing
guard cell become turgid
water potential in guard cell increase
water diffuse into subsidiary cell by osmosis
turgor pressure decrease
which of the following leads to stomatal opening
guard cell become turgid
water potential in guard cell decrease
water diffuse out from guard cell into subsidiary cell by osmosis
turgor pressure decrease
state two function of stoma
regulate gaseous exchange
regulate water loss
regulate the uptake of water
regulate pH of plant
choose the correct statement below
thin wall of guard cell is more elastic
thin wall of guard cell is less elastic
thick wall of guard cell is more elastic
thick wall of guard cell is less elastic
Which of the following is NOT the structure of haemoglobin?
Each haemoglobin molecule contains 4 haem group
Haemoglobin is a quaternary structure
Every each haem group in haemoglobin can bind with 4 molecule of oxygen
Each haemoglobin has 2 α-chain and 2 β-chain polypeptide subunits
Which of the following is not the characteristics of haemoglobin?
Has high affinity towards oxygen
Easily releases oxygen when the partial pressure of oxygen is low
Shows allosteric cooperatively binding characteristic
Carbon dioxide can also bind to haem group of haemoglobin
The opening and closing of stomata is controlled by
The presence of light
The osmotic pressure and turgidity of guard cells
The accumulation of solutes in guard cells
Partial pressure of oxygen and carbon dioxide
Name the gaseous exchange structure in a root.
Lenticel
leaves
stomata
Stoma
Each haemoglobin molecule can bind reversibly with
one atom of oxygen
one molecule of oxygen
two molecules of oxygen
four molecules of oxygen
Which of the following statements is NOT TRUE?
Haemoglobin act as buffer
Haemoglobin binds loosely and reversibly to oxygen
Haemoglobin consist of four polypeptide chain
Haemoglobin can only bind with two molecules of oxygen
