IGCSE Biology Paper-3: Specimen Questions with Answers 275 - 277 of 358

Passage

The boxes on the left contain the names of parts of the body that produce hormones.

The boxes in the center contain the names of hormones.

The boxes on the right contain functions of these hormones.

Rate of Breathing

Question 275 (4 of 4 Based on Passage)

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Short Answer▾

Draw one straight line to link each hormone to the part of the body where it is produced.

Draw one straight line to link each hormone to its function.

Explanation

Rate of Breathing

Question 276

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Using a suitably labelled genetic diagram, explain how a baby can have blood group O (IOIO) when its mother is group A and its father is group B.

Explanation

Using a Suitably Labelled Genetic Diagram
father
IBIO
motherIAIAIBIAIO
IOIBIOIOIO

O blood group

Blood Types of Offspring

Passage

Reproduction is a characteristic of all living organisms.

Question 277 (1 of 4 Based on Passage)

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Fig. shows some examples of reproduction.

Single Celled Organism

State the letter or letters that identify examples of asexual reproduction.

Give a reason for your answer using evidence from Fig.

letter (s) …

reason …

Explanation

A & C

Bacteria reproduce by binary fission. In this process the bacterium, which is a single cell, divides into two identical daughter cells. Binary fission begins when the DNA of the bacterium divides into two (replicates) . The bacterial cell then elongates and splits into two daughter cells each with identical DNA to the parent cell. Each daughter cell is a clone of the parent cell.

Amoeba reproduces by the common asexual reproduction method called binary fission. After replicating its genetic material through mitotic division, the cell divides into two equal sized daughter cells. The genetic material is also equally partitioned; therefore, the daughter cells are genetically identical to each other and the parent cell. In this process, the nucleus of the Amoeba first divides to form two daughter nuclei by the process of Karyokinesis. After the nucleus has divided into two, the process of Cytokinesis takes place in which the cytoplasm in the mother cell divides into two daughter cells.

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