Btec Applied Science Unit 1 Biology

BTEC APPLIED SCIENCE UNIT 1
BIOLOGY

Describe6the6function6of6the6nucleolus6-6ans--Produces6ribosomes6and6RNA

Describe6the6function6of6the6cell6wall6-6ans--Provides6rigidity6and6protection6to6the6cell

Describe6the6function6of6the6chloroplasts6-6ans--
Site6of6photosynthesis6as6they6contain6chlorophyll

Describe6the6function6of6the6plasmodesmata6-6ans--
A6channel6through6the6cell6wall6the6allows6transport6of6materials6from6one6cell6to6another

Describe6the6function6of6the6amyoplasts6-6ans--
Stores6starch6and6converts6starch6back6into6glucose6when6the6plant6needs6energy

Describe6the6function6of6the6vacuole6-6ans--
Stores6water6and6chemicals6for6cell6use.6Also6maintains6turgor6of6cell

Describe6the6function6of6the6tonoplasts6-6ans--
Membrane6the6surrounds6the6vacuole.6Protects6the6vacuole,6isolates6it6from6harmful6sub
stances6and6controls6water6flow6in6and6out6of6the6vacuole

Why6are6gram6positive6bacteria6more6susceptible6to6antibiotics?6-6ans--
Permeable6cell6wall6whereas6gram6negative6bacteria6has6a6semi-permeable6cell6wall

Describe6the6adaptations6found6in6a6palisade6cell6-6ans--Closely6packed6together
Chloroplasts6
Large6vacuole

Explain6why6the6palisade6cell6has6a6large6amount6of6chloroplasts6-6ans--
To6absorb6lots6of6light6for6photosynthesis

Explain6why6palisade6cells6are6closely6packed6together6-6ans--
To6form6a6continuous6layer6in6the6leaf

Explain6why6palisade6cells6have6a6large6vacuole6-6ans--
To6maintain6turgor6(pushes6against6the6cell6wall6to6maintain6rigid6shape)

Describe6the6adaptations6of6a6root6hair6cell6-6ans--Root6hair6shape
Large6vacuole

, Thin6cellulose6walls

Explain6why6root6hair6cells6have6an6elongated6section6known6as6the6root6hair6-6ans--
Increased6surface6area6for6maximum6movement6of6water6into6the6cell

Explain6why6root6hair6cells6have6a6large6vacuole6-6ans--
Contains6cell6sap6with6low6water6potential6to6encourage6water6into6the6cell

Explain6why6root6hair6cells6have6thin6cellulose6walls6-6ans--
Encourage6movement6of6water6and6minerals6into6the6cell.6Short6distance6for6osmosis6an
d6diffusion

Describe6the6adaptations6of6a6sperm6cell6-6ans--Lots6of6mitochondria
Shaped6head6containing6acrosome6(with6enzymes)
Haploid6nucleus
Tail6for6movement

Explain6why6a6sperm6cell6has6an6undulipodium6(tail)6-6ans--
To6allow6the6sperm6to6move6to6the6egg

Explain6why6sperm6cells6contain6large6numbers6of6mitochondria6-6ans--
To6produce6the6large6amounts6of6energy6needed6for6movement

Explain6why6sperm6cells6have6a6shaped6head6-6ans--
To6push6through6the6protective6layer6of6the6egg6cell

Explain6why6sperm6cells6contain6acrosome6in6the6head6-6ans--
To6digest6the6zona6pellucida6to6allow6entry6into6the6egg6cell

Explain6why6sperm6cells6have6a6haploid6nucleus6-6ans--
Contains6half6the6genetic6material.

Describe6the6adaptations6of6egg6cells6-6ans--Contains6a6haploid6nucleus
Protective6outer6layer6(zona6pellucida)
Corona6radiata

Explain6why6egg6cells6have6a6haploid6nucleus6-6ans--Contains6half6the6genetic6material

Explain6why6egg6cells6have6a6zona6pellucida6(protective6layer)6-6ans--
Protects6the6cell6and6only6allows6one6sperm6cell6to6enter.

Explain6why6egg6cells6have6a6corona6radiata6(two6or6three6layers6attached6to6the6zona6p
ellucida)6-6ans--Contains6all6of6the6proteins6needed6to6develop6the6fertilised6cell

Describe6the6adaptations6of6red6blood6cells6-6ans--No6nucleus6(mammals6only)
Biconcave6shape