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

What is defined as the chemical reactions that break down food molecules in cells to release energy?A excretionB movementC nutritionD respiration

2010 Summer

1

Theory

CH1 - CHARACTERISTICS AND CLASSIFICATION OF LIVING ORGANISMS

The diagram shows an arthropod animal. Which features are characteristic of all arthropods?A. jointed legs and segmented bodyB. jointed legs and thora...

2010 Summer

2

Theory

CH1 - CHARACTERISTICS AND CLASSIFICATION OF LIVING ORGANISMS

The diagram shows a section through a flower.Using the key, identify this flower.1. sepals present .................................................. ...

2010 Summer

3

Theory

CH2 - ORGANIZATION AND MAINTENANCE OF THE ORGANISM

Which row shows the most likely number of chloroplasts in three types of cell in a leaf?[Table_1]

2010 Summer

2

Theory

CH2 - ORGANIZATION AND MAINTENANCE OF THE ORGANISM

The diagram shows some liver cells as they appear under the microscope. How many cell walls can be seen?A 0 B 2 C 3 D 5

2010 Summer

1

Theory

CH2 - ORGANIZATION AND MAINTENANCE OF THE ORGANISM

Which row shows the structures present in plant and animal cells?[Table_1: | | cell wall | cytoplasm | nucleus | cell membrane ||--------|-----...

2010 Summer

2

Theory

CH2 - ORGANIZATION AND MAINTENANCE OF THE ORGANISM

Which structure is at a different level of organisation from the other three?A) kidneyB) liverC) neuroneD) testis

2010 Summer

2

Theory

CH2 - ORGANIZATION AND MAINTENANCE OF THE ORGANISM

Which diagram shows one organ only?[Image_1 with diagrams labeled A, B, C, D]

2010 Summer

2

Theory

CH3 - MOVEMENT IN AND OUT OF CELLS

On a dry, sunny day, how does water vapour move through the stomata of a leaf?A. into the leaf by diffusionB. into the leaf by osmosisC. out of the le...

2010 Summer

1

Theory

CH3 - MOVEMENT IN AND OUT OF CELLS

The diagram shows an experiment using a potato.Which shows the result of the experiment after 24 hours?ABCD

2010 Summer

1