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

2

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

1

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

2

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

1

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

2

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

2

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

1

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

1

Theory

CH1 - CHARACTERISTICS AND CLASSIFICATION OF LIVING ORGANISMS

Which characteristic is shown when a person smells a gas in the air?A excretionB movementC respirationD sensitivity

2011 Summer

2

Theory

CH1 - CHARACTERISTICS AND CLASSIFICATION OF LIVING ORGANISMS

The diagram shows four arthropods.[Image_1: Four illustrations labeled Pediculus ×20, Anopheles ×10, Dermacentor ×7, Carcinus ×0.5]How many of the...

2011 Summer

1

Theory

CH1 - CHARACTERISTICS AND CLASSIFICATION OF LIVING ORGANISMS

An organism has dry scales covering its body. To which vertebrate group does it belong? A: amphibian B: fish C: mammal D: reptile

2011 Summer

2

Theory

CH1 - CHARACTERISTICS AND CLASSIFICATION OF LIVING ORGANISMS

The diagram shows an animal. Use the key to identify the animal.1 has legs .......................... go to 2 has no legs ...................... go ...

2011 Summer

2

Theory

CH2 - ORGANIZATION AND MAINTENANCE OF THE ORGANISM

The diagram shows four specialised cells.Which feature is not common to all of these cells?A. cell membraneB. cytoplasmC. diploid number of chromosome...

2011 Summer

1

Theory

CH2 - ORGANIZATION AND MAINTENANCE OF THE ORGANISM

The diagram shows a plant cell.Which labelled structures are found in plant cells but not in animal cells?A P and QB Q and RC R and SD S and T

2011 Summer

2

Theory

CH2 - ORGANIZATION AND MAINTENANCE OF THE ORGANISM

The diagram shows another plant cell.Which feature shows that it is a palisade cell?A a large nucleusB a large vacuoleC a thick cell wallD many chloro...

2011 Summer

2

Theory

CH6 - PLANT NUTRITION

Which structures are adapted for supporting a plant?A. phloem tissuesB. root hair cellsC. stomataD. xylem vessels

2011 Summer

2

Theory

CH2 - ORGANIZATION AND MAINTENANCE OF THE ORGANISM

Which describes the structure and function of a red blood cell? [Table_1]

2011 Summer

2

Theory

CH3 - MOVEMENT IN AND OUT OF CELLS

Boiling potatoes destroys their cell membranes. A peeled, boiled potato strip is placed in a concentrated solution of salts.What takes place?[Table_1]...

2011 Summer

2