Cambridge IGCSE Biology - 0610 - Core Paper 1 2012 Summer Zone 2

Which process in plant cells uses chlorophyll?

The diagram shows the external features of an animal.
To which group does the animal belong?

Which vertebrate groups have scaly skin?

Some cells have cell walls.
Which statements are correct for cell walls?
[Table_1]

The diagram shows a specialised cell cut in half.
What does this diagram indicate about the structure of this cell?

In a mesophyll cell, where are chloroplasts found?

In a plant, a group of xylem vessels form

The bar chart compares the percentage of oxygen carried by red blood cells entering and leaving a relaxed muscle. On the bar chart, 100% is the amount of oxygen carried by red blood cells as they leave the lungs.

How much oxygen would red blood cells be likely to carry when leaving the same muscle after contraction?

Which diagram shows the appearance of a plant cell after it is placed in distilled water?

The diagram shows cells from the epidermis of a leaf.
Which parts are partially permeable?

Equal quantities of a protein-digesting enzyme were added to 5 cm$^3$ of protein solutions of different pH. Each tube was kept at 37°C. The amount of amino acid in each tube was measured after 3 minutes. The results are shown in the table.

[Table_1]

At which pH was the enzyme most active?

Four test-tubes were set up as shown in the diagram. In which tube is the starch digested most quickly?

The activity of lipase is measured in four parts of the gut.
Which part has the most lipase activity?

The table shows the colour of a biuret solution before and after a food test was carried out.
[Table_1: colour of solution before food test / colour of solution after food test; blue / lilac/purple]
Which nutrient was present?

The diagram shows some organs of the digestive system.
Where is amylase made?

The diagram shows the heart as seen from the front.

Which section shows the heart cut through line P-Q?

The graph shows how the rate of transpiration is affected by $X$.

What is $X$?

What is the characteristic feature of a double circulation?

Which process, inside cells, releases energy useful to the human body?

Why is yeast used in bread-making?

How are aerobic and anaerobic respiration similar?

During a long-distance race, the body temperature of an athlete begins to rise.
Which changes occur to help return the body temperature to normal?
[Table_1]

In which order does urea pass through structures in the body?

The diagram shows a section through the human eye.
Which labelled part prevents the internal reflection of light in the eye?

The diagram shows the bones and muscles of the upper arm.
What must happen for the bones in the lower arm to move in the direction of the arrow?

Which combination of structural features is found in a wind-pollinated flower?

The diagram shows a dandelion fruit attached to a parachute of hairs.

The following results were obtained during an experiment to investigate the time taken for the fruits of four different dandelions to fall to the ground.
[Table_1]
Which conclusion can be drawn from these results?

How is development of an organism defined?

An experiment is set up at 20°C to investigate some conditions necessary for the germination of seeds.
In which apparatus will germination occur?

In pea plants, the allele for tall stems is dominant to the allele for short stems. A heterozygous tall plant is crossed with a short plant, and 100 offspring are produced.
How many of the offspring are likely to be tall?

The nucleus in a body cell of a fly contains 12 chromosomes. How many chromosomes are there in the nucleus of a sperm from this fly?

In a species of plant, the allele for red flowers (R) is dominant over the allele for white flowers (r). Two red-flowered plants were crossed.
parents: plant with red flowers × plant with red flowers
offspring: 93 red-flowered and 28 white-flowered
What are the genotypes of the parents?

The diagram shows a food chain.

grass → wildebeest → lion

What is the original source of energy used in this food chain?

What may happen to the Sun’s energy that reaches the Earth?

The diagram shows energy flow through a food chain from X to Y.

By which processes is energy lost between X and Y?

The diagram shows the movement of carbon atoms in part of the carbon cycle. The directions of movement are not shown.
How many of the groups of living organisms in the diagram return carbon dioxide to the atmosphere?

The diagram shows part of the water cycle.
[Diagram: Rain cloud with arrows showing compounds in living plants and animals, and water vapour in the air].
Which process in living plants is responsible for returning water vapour to the air at P?

The diagram shows how the size of a population may change with time.
At which point is the population growing the fastest?

Which agricultural activity can cause the most pollution?

The graph shows the levels of dissolved oxygen and mineral ions in a river.
At what point does raw sewage enter the river?