IGCSE Biology Paper-2: Specimen Questions with Answers 124 - 127 of 203

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Question 124

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

Question 125

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) = 1 m

1 millimeter (mm)

1 micrometer (µm)

1 nanometer (nm)

Value of P:- will be

Question 126

Question

MCQ▾

The diagram is showing a parenchymal cell.

The Diagram is Showing a Parenchymal Cell

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

Magnification

Question 127

Question

MCQ▾

The diagram shows a flowering plant.

The Diagram Shows a Flowering Plant

To which group this plant belongs.

Choices

Choice (4)

a.

Algae

b.

Pteridophyte

c.

Angiosperm

d.

Gymnosperm

Answer

c.

Explanation

Angiosperms

  • 130 million years ago in Jurassic (dicot plant) and cretaceous (monocot plants) period of Mesozoic era. Tertiary period of Cenozoic era is called as Age of angiosperms.
  • Angiosperms are found in every habitat. They constitute more than 50 % of total plants on this earth.
  • Angiosperms are seed bearing, flowering vascular plants in which seeds are enclosed in fruits. The term angiosperm means ‘enclosed seeds’ as seeds (ovules) are found enclosed in the ovary wall.
  • Instead of cone, angiosperms bear flowers. The flower is the most characteristic structure of the angiosperms.
  • Flower is defined as a modified shoot meant essentially for the reproduction of the plant.
  • The flower usually develops as a branch from a bud, growing in the axil of a small leaf like structure known as bract. A stalk called pedicel, supports the flower in the axil of the bract. The upper swollen end of the pedicel called receptacle or thalamus bears all the floral parts.
  • A typical angiospermic flower consists of 4 whorls, viz. , calyx, corolla, androecium and gynoecium. Both, calyx and corolla are known as accessory or helping whorls. The androecium and gynoecium are called reproductive or essential whorls.
  • Androecium (stamen) is microsporophyll and gynoecium (carpel) is megasporophyll.
  • Megasporophyll is differentiated into ovary, style, and stigma.
The Diagram Shows a Flowering Plant

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