Topic 2 Review

A bird disease spread in a pigeon population, resulting in the deaths of 95% of the pigeons in one year. The following year, a survey of the same area showed that only 10% of the remaining population had the disease.

•   density independent factors cause negative feedback

• density independent factors cause positive feedback

• density dependent factors caused negative feedback

• density dependent factors cause positive feedback

Autotrophs are organisms that:

• Produce nutrients for producers

• Transform light energy to heat energy

• Gain energy by eating other organisms

• Produce their own energy through photosynthesis

Why do most marine food chains rarely have more than four trophic levels? 

• Energy is transferred inefficiently as it moves along the food chain.

• Many species have become extinct. 

• Fishing activities have increased significantly

• There is great competition for food.

Most of the world's hot deserts are found at latitudes

• between the tropical rainforest and temperate rainforest biomes.

• between taiga and the tundra biome

• between mediterranean and temperate forests

• between the temperate rainforests and tundra biomes.

A student wishes to determine how the decrease in pollution levels affect plant diversity with distance from a highway into a forest. Which sampling technique would the student need to use?

• Random sampling

• Stratified sampling

• Transect sampling

• Systematic sampling

What role do the oceans play in the carbon cycle?

• In cold temperatures, they are a significant source of carbon that is released into the atmosphere.

• Absorbing carbon dioxide increases the pH of the oceans

• Carbon is exchanged between oceans and the atmosphere.

• Carbon is not exchanged between the atmosphere and oceans directly.

What is the name of an interaction in which one organism feeds on another by living on or in it and harming it? 

• Mutualism 

• Parasitism 

• Competition 

• Predation 

Which of the following resources are used in photosynthesis.

I) Oxygen;

II) Water;

III) Green wavelength of light;

IV) Red & blue wavelengths of light;

V) Chlorophyll;

VI) Carbon dioxide

• IV, V,VI

• I, II, IV, V

• II, IV, V, VI

• II, III, V, VI

Which term below does not refer to an organism getting its energy from a producer?

• Secondary consumer

• Decomposer

• Herbivore

• Primary consumer

Which of the following are factors directly affect the rate of photosynthesis? 
I.   Soil temperature
II.  Air humidity  
III. Nutrient availability
IV. Light intensity
V.  Soil moisture
VI. Carbon dioxide concentration
VII. Leaf area

• II, IV, V, VI and VII

• I, II, IV, V, VII

• I, II, IV and VI

• All of these