Paper 2 training

Which statement defines excretion?

• the chemical reactions in cells that break down nutrient molecules and release energy for

  metabolism

• the removal from organisms of the waste products of metabolism

• the taking in of materials for energy, growth and development

• the ability to detect or sense stimuli in the internal or external environment and to make

  appropriate responses

The diagram shows an incomplete plant cell.

Which structure is not shown?

• cell membrane

• cell wall

• chloroplast

• vacuole

What are the molecules that make up fats and oils?

• amino acids and glycerol

• fatty acids and glycerol

• glucose and amino acids

• glucose and fatty acids

Which graph shows the effect of increasing light intensity on the rate of photosynthesis?

• A

• B

• C

• D

The diagram shows part of the alimentary canal and associated organs.

Where is lipase produced?

• A

• B

• C

• D

The diagram shows a food web.

How many organisms act as secondary consumers in this food web?

• 2

• 3

• 4

• 6

The electronic structures of four isotopes are shown.

Which isotopes have the same chemical properties?

• 1 and 3

• 1 and 4

• 2 and 3

• 2 and 4

What is the mass of hydrogen in 51 g of ammonia, NH3?

• 3 g

• 9 g

• 14 g

• 17 g

Molten lead(II) bromide is electrolysed.

Which equation represents the reaction at the cathode?

• 
• 
• 
• 

Substance X is insoluble in water.

It reacts with dilute nitric acid to produce solution Y and a gas which turns limewater milky.

A white precipitate is formed when aqueous sodium hydroxide is added to solution Y. This

precipitate remains when excess sodium hydroxide is added.

What is substance X?

• calcium carbonate

• calcium chloride

• zinc carbonate

• zinc chloride