FREE BIOLOGY AND STUDY GAMES ABOUT BIO 20 UNIT 1

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FREE BIOLOGY AND STUDY GAMES ABOUT BIO 20 UNIT 1

EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -99 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: Human Impact

Answer:

Humans have the greatest impact on the disruption of the dynamic equilibrium of earth

Question 2: Run off

Answer:

flowing of precipitation into rivers, streams, ponds, lakes and oceans

Question 3: Oxygen Cycle

Answer:

-found in the atmosphere -from earth to living things through photosynthesis -from living things to earth through cellular respiration -important in combustion and decomposition

Question 4: Biotic Potential

Answer:

The maximum number of offspring that a species could produce with unlimited resources

Question 5: Biotic

Answer:

The living components of the biosphere

Question 6: Seepage

Answer:

Absorption of water into the ground

Question 7: Birth Potential

Answer:

the maximum number of offspring per birth

Question 8: Summer an Water Density

Answer:

Layers form due to density, with water at 4C being at the bottom.When water becomes warmer it looses its ability to hold dissolved oxygen

Question 9: Scientific Models

Answer:

Scientists use models to help visualize something that has not been directly observed. Models are important because they provide a pathway for making prediction

Question 10: Inorganic Carbon

Answer:

-atmosphere: smallest amount -ocean: dissolved in water -rock: on the ocean floor or in sedimentary rock; released back into the cycle through geological conditions

Question 11: Levels of Organization

Answer:

Cells, tissues, organs, organ system, and functioning body

Question 12: Deforestation

Answer:

-Slash and Burn: the complete clearing of a forest by felling and burning trees

-Clear cutting: the removal of all trees in an area

-Selective Cutting: The harvesting of only certain trees from an area

Question 13: Nitrification

Answer:

Bacteria convert ammonia into nitrates and nitrites and nitrites into nitrates. Requires oxygen to function(adding oxygen). Nitrates are absorbed by plants, consumed by animals, restarting the cycle

Question 14: Biosphere

Answer:

The narrow zone around Earth that harbours life Question 15: Human use of Energy: Monocultures

Answer:

Changing the biodiversity clearing land to plant food crops of one culture

Question 16: pH of Soil

Answer:

The pH of soil is determined by the rock from which the soil originated and the plants that grow in it.Humans contribute to a higher level of acidity by burning fossil fuels. The pH of the soil determines which plants will grow best

Question 17: Closed System

Answer:

A system where the amount of matter is fixed and finite. Earth is a closed system. If one thing changes in a closed system, the rest will be affected

Question 18: Ammonification

Answer:

Fungi and Bacteria convert N2 from decomposed organic wastes into NH3, which cannot be used by plants

Question 19: Clearing vegetation

Answer:

decreasing the amount of carbon removed from the atmosphere through photosynthesis

Question 20: Negative Effects of Deforestation

Answer:

-Soil erosion and runoff into streams increases -Nitrates and other nutrients are carried into streams and ponds, increasing algae growth -Loss of habitat -Replanting can take 80-90 years before trees are big enough to harvest.

Question 21: Nitrogen Fixation

Answer:

-nitrogen must be converted into nitrate to be useful to plants

• can be converted through lightning, reacting with O2 to form NO3

-bacteria produce most nitrates in ecosystems; found in soil or the root hairs of legumes

Question 22: Fire

Answer:

An important and often useful cause of change in an ecosystem

Question 23: Food Chain

Answer:

A sequence linking organisms that feed each other, starting with a food source and continuing in order with each consumer

Question 24: Aquatic Ecosystems

Answer:

Are found in ponds, rivers, lakes and oceans. In Alberta, the major aquatic ecosystems are freshwater systems (lakes)

Question 25: Oligotrophic lakes

Answer:

deep, cold and low in nutrient levels

Question 26: Human use of Energy; Fishing

Answer:

New technologies have increased the ease and rate at which fish are being caught