Beth yw'r ffynhonnell wreiddiol o egni ar gyfer organebau byw? / What is the original source of energy for living organisms?

• Y ddaear / The earth

• Y gwynt / The wind

• Y haul / The sun

• Y dŵr / The water

Explain the meaning of the term 'producer'.
Esboniwch ystyr y term 'cynhyrchydd'.

• An organism that eats other animals
  Organeb sy'n bwyta anifeiliaid eraill

• An organism that produces its own food through photosynthesis
  Organeb sy'n cynhyrchu ei fwyd ei hun trwy ffotosynthesis

• An organism that decomposes materials
  Organeb sy'n dadelfennu deunyddiau

• An organism that transfers energy
  Organeb sy'n symud egni

Beth mae'r saethau yn cynrychioli mewn cadwyn fwyd? / What do the arrows represent in a food chain?

• Symudiad dŵr / Movement of water

• Trosglwyddo egni neu 'bwyta gan' / Transfer of energy or 'eaten by'

• Symudiad aer / Movement of air

• Trosglwyddo maetholion / Transfer of nutrients

Beth yw'r term a ddefnyddir i ddisgrifio organeb sy'n cael egni trwy fwyta organeb arall? (What is the term used to describe an organism that obtains energy by consuming another organism?)

• Cynhyrchydd (Producer)

• Dadelfennydd (Decomposer)

• Defnyddiwr (Consumer)

• Planhigyn (Plant)

Define the term 'llofrudd'.

Diffiniwch y term 'llofrudd'.

• An organism that eats meat

  Organeb sy'n bwyta cig

• An organism that eats only plants

  Organeb sy'n bwyta planhigion yn unig

• An organism that eats everything

  Organeb sy'n bwyta popeth

• An organism that eats bacteria

  Organeb sy'n bwyta bacteria

Beth yw'r term a ddefnyddir i ddisgrifio un cam mewn pyramid o niferoedd/biomas? / What is the term used to describe a single step in a pyramid of numbers/biomass?

• Lefel troffig / Trophic level

• Lefel egni / Energy level

• Lefel cynhyrchydd / Producer level

• Lefel defnyddiwr / Consumer level

Enwch ddau fath o ddadelfenwyr.

Name two types of decomposers.

• Bacteria a ffyngau

  Bacteria and fungi

• Planhigion a phryfed

  Plants and insects

• Anifeiliaid a phlanhigion

  Animals and plants

• Pryfed a bacteria

  Insects and bacteria

What is the meaning of the term 'decomposers'? / Beth yw ystyr y term 'dadelfenwyr'?

• Organisms that eat plants / Organebau sy'n bwyta planhigion

• Organisms that digest and decompose surrounding material / Organebau sy'n treulio a dadelfennu deunydd o'u cwmpas

• Organisms that transfer energy / Organebau sy'n symud egni

• Organisms that produce their own food / Organebau sy'n cynhyrchu eu bwyd eu hunain

How is energy lost in a food chain? / Sut mae egni yn cael ei golli mewn cadwyn fwyd?

• Through heat loss during respiration and in waste material / Trwy golli gwres yn ystod resbiradaeth a mewn deunydd gwastraff

• Through water movement / Trwy symudiad dŵr

• Through photosynthesis / Trwy ffotosynthesis

• Through air movement / Trwy symudiad aer

Beth yw'r cynhyrchion a ffurfiwyd dros amser pan na chaiff pydredd ei atal? / What are the products formed over time when decay is not prevented?

• Dŵr a halen / Water and salt

• Tanwyddau ffosil fel glo, olew a nwy / Fossil fuels like coal, oil, and gas

• Planhigion a dŵr / Plants and water

• Bacteria a ffyngau / Bacteria and fungi