2.2 Communities & Ecosystems

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Define community

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15 Terms

1

Define community

A group of populations living and interacting with each other in a common habitat

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2

Define ecosystem

The interaction between a community and the non living parts of the environment

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3

Define photosynthesis

The process by which plants make their own food from water and carbon dioxide using energy from sunlight

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4

What is the equation for photosynthesis?

Carbon dioxide + water → Glucose + oxygen

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5

What are the inputs for photosynthesis?

Sunlight as energy source, carbon dioxide and water

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6

What are the processes for photosynthesis?

Chlorophyll in chloroplasts captures certain visible wavelengths of sunlight energy and stores this as chemical energy

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7

What are the outputs of photosynthesis?

Glucose and oxygen

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8

What are the transformations in photosynthesis?

LIght energy is transformed into stored chemical energy (in organic matter e.g. carbohydrates, proteins and fats).

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9

What do the products of photosynthesis help with?

Being the raw material for producing biomass

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10

What is glucose used for in a plant?

  • Respiration: where energy is released from the breakdown of glucose

  • Making celluloses to make strong cell walls, especially in a rapidly growing plant

  • Combining with nitrate ones in the soil to form amino acids for protein synthesis

  • Producing fats/oils for storage (in seeds)

  • Converted as insoluble starch for storage in stems, leaves and roots

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11

Define biomass

The mass of living material

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12

Define respiration

The conversion of organic matter (glucose) into carbon dioxide and water in all organisms, releasing energy and heat

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13

What is the equation for respiration?

Glucose + oxygen → Carbon dioxide + water

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14

What are the inputs, processes and outputs of respiration?

  • Inputs: glucose and oxygen

  • Processes: oxidation inside cells

  • Outputs: release of energy or work and heat

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15

What are the transformations in respiration?

Stored chemical energy is transformed into kinetic energy and heat

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