Urea is made from surplus proteins in:

Absolute zero is:

Transpiration is:

Which one of the following best compares the eye and a camera?

The blood cells that engulf invading microorganisms are:

We lose water mainly in:

When testing a leaf for the presence of starch, the correct sequence of procedures is:

All gas exchange surfaces in vertebrate animals have:

The correct equation for photosynthesis is:

When something gets hotter, the particles in it gain more:

The main parts of the human circulatory system are:

When we are too hot, more blood flows through the capillaries near the surface of the skin. This helps us to cool down because the blood loses heat by:

During adolescence, boys:

Water passes out of leaves through the:

Breathing in fish involves which two processes?

Each of the features of our bodies is controlled by a:

The particles in a liquid:

Hormonal methods of contraception work by:

Why is testing a leaf for starch a reliable indication that photosynthesis has taken place?

Which of the following can cross the placenta from mother to fetus?

The wall of the heart is made of:

Which of the following statements about anaerobic respiration is true?

Which of the following are all secondary sex characteristics in females?

Many leaves are adapted to photosynthesise effectively by having:

Which one of the following pairs of definitions is correct?

Which of the following tests describes the test for glucose?

Which of the following nutrients is/are digested in the stomach?

Which of the following properties of water is not important to the survival of living things?

The density of seawater is:

Which statement is not true of sperm and ova?

Excretion is best defined as:

Which of the following are all deficiency diseases?

When carbon dioxide gas passes through limewater, the limewater:

In a simple reflex action:

Overfishing means:

Three factors that increase the risk of coronary heart disease are:

Compared to industrialised countries, developing countries:

Photosynthesis is important because:

We do not see an object if rays of light from it are focussed on the blind spot because:

Which one of the following best describes hormones?