All gas exchange surfaces in vertebrate animals have:
Excretion is best defined as:
The correct equation for photosynthesis is:
Which of the following tests describes the test for glucose?
Photosynthesis is important because:
We do not see an object if rays of light from it are focussed on the blind spot because:
When carbon dioxide gas passes through limewater, the limewater:
Which one of the following pairs of definitions is correct?
Veins have valves because
When something gets hotter, the particles in it gain more:
In a simple reflex action:
Which of the following are all deficiency diseases?
Sea breezes result because:
Compared to industrialised countries, developing countries:
Water reabsorption is controlled by:
We lose water mainly in:
Urea is made from surplus proteins in:
When we sweat, we lose heat because:
When testing a leaf for the presence of starch, the correct sequence of procedures is:
The point where two neurones connect is called:
The wall of the heart is made of:
Which one of the following best describes hormones?
The blood cells that engulf invading microorganisms 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:
Which of the following nutrients is/are digested in the stomach?
The density of pure water is:
Which of the following statements about anaerobic respiration is true?
A person of blood group AB has:
Which one of the following lists only differences between aerobic respiration and anaerobic respiration?
Demersals are fish that are found:
Which statement is not true of sperm and ova?
Which of the following can cross the placenta from mother to fetus?
Hormonal methods of contraception work by:
Some plants reproduce by forming bulbs. The new plants that grow from the bulbs will be genetically identical
The density of seawater is:
Which one of the following best compares the eye and a camera?
Measuring plant growth by measuring height is convenient, but inaccurate because:
The particles in a liquid:
The workplace should be:
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