IGCSE Biology Paper-2: Specimen Questions with Answers 191 - 192 of 203
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Question 191
Question
MCQ▾The given diagram is showing a cell organelle.
Which statement is Incorrect with respect to the organelle shown above?
Choices
Choice (4) | |
---|---|
a. | Involves in energy production |
b. | Removes waste |
c. | Removes carbon dioxide |
d. | Involves in breakdown of cellulose |
Answer
a.Explanation
Mitochondria are double membrane cell organelle.
Functions of Mitochondria
- Most of the ATP is produced by mitochondria during respiration. These ATP are required for performing various metabolic activities. Thus mitochondria is called powerhouse of cell.
- Enzymes of Krebs cycle, fatty acids synthesis, amino acids synthesis are found in matrix.
- The gene for male sterility in maize plants is found in mt DNA. Thus, it helps in cytoplasmic inheritance.
- Mitochondria help in Vitellogenesis in oocytes.
- Heme protein required for haemoglobin, cytochrome, and myoglobin is synthesized in mitochondria.
Question 192
Question
MCQ▾Transport in the body mainly occurs in the form of
Choices
Choice (4) | |
---|---|
a. | |
b. | Dissolved in plasma |
c. | bicarbonates |
d. | Carbamino hemoglobin |
Answer
c.Explanation
Transport of: Occur in three forms:
As dissolve form: 7 % is transported as dissolved form in water of plasma.
As carbamino hemoglobin: Hb.
This percentage of combine with amino group of globin protein of haemoglobin to form carbamino haemoglobin
As bicarbonate compound (70 % CO2)
- This percentage of diffuse in RBC and dissolve in water of cytoplasm to form carbonic acid.
- Formation of carbonic acid is occur in presence of carbonic anhydrase enzyme which increase rate of formation of carbonic acid 5000 times.
- Carbonic acid now dissociates into ions and Bicarbonate ions.
- To regulate pH of blood haemoglobin act as buffer and combine with H + ion to form Haemogloginic acid.
- Bicarbonate ions are highly diffusible ions. They diffuse in plasma from RBC and combine with ions to form Sodium Bicarbonate.
- To maintain ion equilibrium, in the same of ions ions also diffuse in RBC from plasma. It is called chloride shift or Hamburger phenomena.
- Ions combine with K + ion to form potassium chloride.