IGCSE Biology Paper-1: Specimen Questions with Answers 202 - 203 of 208

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Question

MCQ▾

The diagram shows different type of venation in monocot and dicot leaf.

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What does P and Q represent?

Choices

Choice (4)
a.	P-reticulate venation, Q-reticulate venation
b.	P-reticulate venation, Q-parallel venation
c.	P-parallel venation, Q-parallel venation
d.	P-parallel venation, Q-reticulate venation

Answer

Explanation

Venation is the arrangement of the veins and the veinlets in a leaf. It is of two types:

• Reticulate Venation: - The veins are arranged in a net like manner, e. g. , Dicots.
• Parallel Venation: - The veins are arranged parallel to each other, e. g. , Monocots.

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Question

MCQ▾

The diagram of glycogen which is storage carbohydrate in animals is shown.

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What X represents which is a monomer unit?

Choices

Choice (4)
a.	Glucose
b.	Fructose
c.	Starch
d.	Lactose

Answer

Explanation

Polysaccharides

• They are formed by joining of Monosaccharides (Monomers) by Glycosidic bonds between 1 - 4 carbon atoms. (In a polysaccharide chain the right end is called ‘reducing end’ and the left end is called non-reducing end)
• They are non-reducing and mostly insoluble in water.

Types of Polysaccharides

• Storage polysaccharides – e. g. Glycogen and Starch
• Structural polysaccharides – e. g. Cellulose and Chitin

Glycogen

It is present in animals (also called animal starch). It is a branched chain compd. and has about 30 α-glucose units. It gives ‘red colour’ with iodine solution.

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