Theory

CH21 - HUMAN INFLUENCES ON ECOSYSTEMS

What could be a consequence of deforestation?A. More habitats are produced for animals and plants.B. More transpiration may increase rainfall.C. Rainw...

2009 Summer

Theory

CH21 - HUMAN INFLUENCES ON ECOSYSTEMS

The diagram shows the positions of four farms and the concentrations of nitrate at different points in a river.Which farm is likely to have been using...

2009 Summer

Theory

CH21 - HUMAN INFLUENCES ON ECOSYSTEMS

Untreated sewage can cause pollution of streams and rivers. Some changes in streams and rivers after sewage is added are shown.1. fish die2. the disso...

2009 Summer

Theory

CH21 - HUMAN INFLUENCES ON ECOSYSTEMS

An agricultural student investigated nutrient cycles on a farm where cattle are kept for milk. The farmer grows grass and clover as food for the cattl...

2009 Summer

Theory

CH21 - HUMAN INFLUENCES ON ECOSYSTEMS

The levels of carbon dioxide in the Earth's atmosphere have increased during the last one hundred years.What is the most likely cause of this?A cuttin...

2009 Winter

Theory

CH21 - HUMAN INFLUENCES ON ECOSYSTEMS

The graph shows the relationship between sulfur dioxide pollution and the number of lichen species found on trees.From the graph, which statement is c...

2009 Winter

Theory

CH21 - HUMAN INFLUENCES ON ECOSYSTEMS

The graph shows the relationship between sulfur dioxide pollution and the number of lichen species found on trees.From the graph, which statement is c...

2009 Winter

Theory

CH21 - HUMAN INFLUENCES ON ECOSYSTEMS

The levels of carbon dioxide in the Earth's atmosphere have increased during the last one hundred years.What is the most likely cause of this?A cuttin...

2009 Winter

Theory

CH21 - HUMAN INFLUENCES ON ECOSYSTEMS

What makes nuclear fall-out dangerous to living organisms?A. It causes flooding.B. It causes global warming.C. It damages DNA.D. It damages soils.

2010 Summer

Theory

CH21 - HUMAN INFLUENCES ON ECOSYSTEMS

A very large area of land has been cleared of rainforest and planted with soybean.What result of deforestation will encourage the growth of the soybea...

2010 Summer

MCQ

CH1 - CHARACTERISTICS AND CLASSIFICATION OF LIVING ORGANISMS

Some yeast, sugar and water are mixed in a test-tube. The diagrams show the test-tube at the start and after one hour. Which process causes this chan...

2016 Summer

MCQ

CH1 - CHARACTERISTICS AND CLASSIFICATION OF LIVING ORGANISMS

Which name is given to a group of individuals that can reproduce to produce fertile offspring?

2016 Summer

MCQ

CH1 - CHARACTERISTICS AND CLASSIFICATION OF LIVING ORGANISMS

Use the key to identify the animal shown in the diagram.

2016 Summer

MCQ

CH2 - ORGANIZATION AND MAINTENANCE OF THE ORGANISM

Which organelles are present in large numbers in cells that produce insulin?

2016 Summer

MCQ

CH2 - ORGANIZATION AND MAINTENANCE OF THE ORGANISM

The actual thickness of the leaf shown in the diagram is 2000 \mu m, but its thickness in the diagram is 50 mm. What is the magnification of the diag...

2016 Summer

MCQ

CH3 - MOVEMENT IN AND OUT OF CELLS

The diagram shows an experiment on osmosis. Which arrow shows the direction of the net movement of water at the start of the experiment?

2016 Summer

MCQ

CH3 - MOVEMENT IN AND OUT OF CELLS

Active transport is the movement of

2016 Summer

MCQ

CH4 - BIOLOGICAL MOLECULES

When bases pair up in the formation of DNA, what is one of the pairings? [Options provided]

2016 Summer

MCQ

CH4 - BIOLOGICAL MOLECULES

Small molecules are used as the basic units in the synthesis of large food molecules. Which statement is correct?

2016 Summer

MCQ

CH5 - ENZYMES

Which graph shows the effect of temperature on the activity of an enzyme?

2016 Summer