IGCSE Biology Paper-4: Specimen Questions with Answers 174 - 176 of 279

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Passage

Sickle-cell anemia is an inherited disease.

Show is a photomicrograph of some blood cells from a person who has sickle-cell anemia.

Sickle-Cell Anemia

Question 174 (4 of 4 Based on Passage)

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One Liner▾

Sickle-cell anemia is most common in areas of the world where the infectious disease malaria is found.

Some species of the genus Plasmodium cause malaria in humans.

(i) Define the term species.

Explanation

It is the basic unit of classification. According to ‘Biological concept of species’ , the species can be defined as a group of natural populations whose members can interbreed among themselves and are reproductively isolated from other such groups.

Question 175

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Short Answer▾

Blood is transported in arteries and veins.

Complete the drawings of the cross-sections of an artery and a vein to show the differences between these two types of blood vessel. Label the lumen in each drawing.

Artery and Vein

Explanation

Artery and Vein

Question 176

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Short Answer▾

Table shows some of the enzymes, their substrates, products and where they are produced in the digestive system.

Complete Table.

Some of the Enzymes, Their Substrates, Products and Where They Are Produced in the Digestive System
enzymesubstrateproduct (s)location of enzyme production
starchsalivary glands
maltasemaltose
amino acidsstomach wall
amino acidspancreas and small intestine wall
lipasefats

Explanation

Some of the Enzymes, Their Substrates, Products and Where They Are Produced in the Digestive System
enzymesubstrateProduct (s)location of enzyme production
Salivary

amylase

starchmaltosesalivary glands
maltasemaltoseGlucoseWall of small intestine
pepsinproteinamino acidsstomach wall
trypsinproteinamino acidspancreas and small intestine wall
lipasefatsFatty acid and glycerolpancreas and small intestine wall

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