Theory

CH21 - HUMAN INFLUENCES ON ECOSYSTEMS

A student measured the uptake and release of carbon dioxide from a plant during 24 hours. It was a very bright, sunny day between sunrise and sunset.F...

2010 Summer

3

Theory

CH21 - HUMAN INFLUENCES ON ECOSYSTEMS

(a) (i) State one cause of acid rain other than that shown in Fig. 4.1...................................................................................

2010 Summer

1

Theory

CH21 - HUMAN INFLUENCES ON ECOSYSTEMS

(a) Define the term population...........................................................................................................................

2011 Winter

2

Theory

CH21 - HUMAN INFLUENCES ON ECOSYSTEMS

(a) (i) State two types of natural disaster that occur suddenly and may lead to severe food shortages.1..................................................

2010 Summer

2

Theory

CH21 - HUMAN INFLUENCES ON ECOSYSTEMS

There is evidence that the concentration of carbon dioxide in the Earth's atmosphere is increasing.Which change could explain this?A. less combustion ...

2012 Winter

3

Theory

CH21 - HUMAN INFLUENCES ON ECOSYSTEMS

Which human activity can cause eutrophication of lakes? A. releasing carbon dioxide B. releasing sulfur dioxide C. using fertilisers D. using pesticid...

2012 Winter

2

Theory

CH21 - HUMAN INFLUENCES ON ECOSYSTEMS

Insecticides sprayed in low concentrations may increase the yield of a crop, but may also be harmful to wildlife. What is an explanation for this?A In...

2012 Winter

3

Theory

CH21 - HUMAN INFLUENCES ON ECOSYSTEMS

What effect does deforestation have on the levels of carbon dioxide, oxygen and water vapour in the atmosphere?[Table_1]carbon dioxideoxygenwater vapo...

2010 Winter

3

Theory

CH21 - HUMAN INFLUENCES ON ECOSYSTEMS

A persistent pesticide is one that does not break down.What is one disadvantage of a persistent pesticide?A. It becomes more concentrated at each leve...

2010 Winter

2

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

2

Theory

CH7 - HUMAN NUTRITION

Why does the energy needed by a human increase during the first ten years of life?A. Coordination and responses improve.B. Energy is needed for gamete...

2014 Summer

2

Theory

CH1 - CHARACTERISTICS AND CLASSIFICATION OF LIVING ORGANISMS

Which feature is characteristic of both annelids and arthropods? A) compound eyes B) jointed limbs C) segmented bodies D) wings

2014 Summer

2

Theory

CH2 - ORGANIZATION AND MAINTENANCE OF THE ORGANISM

Which features do animal cells share with plant cells? [Table_1]

2014 Summer

2

Theory

CH1 - CHARACTERISTICS AND CLASSIFICATION OF LIVING ORGANISMS

The diagram shows an animal. Use the key to identify the animal.1 wings present ............................................ go to 2wings absent ........

2014 Summer

2

Theory

CH2 - ORGANIZATION AND MAINTENANCE OF THE ORGANISM

Which pair of statements about a plant cell is correct?[Table_1][Table_1]:| | outer surface of the cell | position of sap vacuole ||---|----...

2014 Summer

1

Theory

CH2 - ORGANIZATION AND MAINTENANCE OF THE ORGANISM

The diagram shows a cell. Which structure is not present?A. cell membraneB. cell wallC. cytoplasmD. nucleus

2014 Summer

7

Theory

CH2 - ORGANIZATION AND MAINTENANCE OF THE ORGANISM

The diagram shows a section through a root.What are the levels of organisation of the labelled structures?[Table_1]

2014 Summer

6

Theory

CH2 - ORGANIZATION AND MAINTENANCE OF THE ORGANISM

Which structures contain a cell nucleus?[Table_1]Table Key:✓ = nucleus✗ = no nucleus

2014 Summer

2

Theory

CH3 - MOVEMENT IN AND OUT OF CELLS

The diagram shows a cell. [Image_1: Diagram of a cell] Which type of cell does the diagram show? A. an animal cell in a concentrated solution of sa...

2014 Summer

2

Theory

CH3 - MOVEMENT IN AND OUT OF CELLS

Two identical cylinders, 40 mm long, are cut from a potato. One (W) is placed in water and the other (X) is placed in a concentrated sugar solution.Wh...

2014 Summer

1