IGCSE Biology Paper-2: Specimen Questions with Answers 191 - 192 of 203

Question 191

Edit

Question

MCQ▾

The given diagram is showing a cell organelle.

The given diagram is showing a cell organelle

The Given Diagram is Showing a Cell Organelle

Loading image

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.
Functions of mitochondria

Functions of Mitochondria

Loading image

Question 192

Edit

Question

MCQ▾

Transport in the body mainly occurs in the form of

Choices

Choice (4)
a.
b.Dissolved in plasma
c.bicarbonates
d.Carbamino haemoglobin

Answer

c.

Explanation

Transport of: Occur in three forms:

As dissolve form: 7% is transported as dissolved form in water of plasma.

As carbamino haemoglobin: Hb.

This percentage of combine with amino group of globin protein of haemoglobin to form carbamino haemoglobin

As bicarbonate compound ()

  • 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.
Oxygen release and caebon dioxide

Oxygen Release and Caebon Dioxide

Loading image