IGCSE Biology Paper-2: Specimen Questions with Answers 124 - 126 of 203

Question 124

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Question

MCQ▾

When a food sample is tested with iodine solution, which color shows the presence of starch?

Choices

Choice (4)
a.Blue-Black
b.Orange
c.Purple
d.Brown

Answer

a.

Explanation

Iodine test. The iodine test is used to test for the presence of starch. Starch turns into an intense “blue-black” colour upon addition of aqueous solutions of the triiodide anion.

Iodine test

Iodine Test

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Question 125

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Question

MCQ▾

A student was told that a diagram of a bacterial cell had been magnified 30,000 times. The length of the drawing was 45 mm.

What was the actual length of the bacterium?

Choices

Choice (4)
a.
b.
c.
d.

Answer

d.

Explanation

SI UNITS:

1 meter (m) = 1m

1 millimeter (mm)

1 micrometer (µm)

1 nanometer (nm)

Value of P: - will be

Question 126

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Question

MCQ▾

The diagram is showing a parenchymal cell.

The diagram is showing a parenchymal cell

The Diagram is Showing a Parenchymal Cell

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The distance between points P and Q on the diagram is 40 mm.

The actual length of the cell between P and Q was.

What is the magnification of the cell?

Choices

Choice (4)
a.
b.
c.
d.

Answer

a.

Explanation

SI UNITS

  • 1 meter (m) = 1m
  • 1 millimeter (mm)
  • 1 micrometer (µm)
  • 1 nanometer (nm)

Magnification