Key term
Eduqas A-Level Biology A400QS
Biological Molecules
Cell Structure and Organisation
Cell Membranes and Transport
Enzymes
Nucleic Acids and Their Functions
Importance of ATP
Photosynthesis
Respiration
Microbiology
Population Size and Ecosystems
Topic overviewPopulation growth and its measurementThe population growth curve and carrying capacityDensity dependent and density independent factorsSampling abundance and distributionEcosystems, habitats and communitiesEnergy transfer and pyramids of biomassSuccessionDecomposition and the carbon cycleThe nitrogen cycle and human interventionEutrophication and the effects of drainage
Human Impact on the Environment
Classification and Biodiversity
Topic overviewThe need for classification and the taxonomic hierarchyThe three domain and five kingdom systemsCharacteristic features of the five kingdomsAssessing relatedness by physical features and biochemistryThe species concept and the binomial systemBiodiversity, adaptation and natural selectionMeasuring biodiversity in a habitatGenetic and molecular measures of biodiversity
Mitosis and Meiosis
Sexual Reproduction in Humans
Sexual Reproduction in Plants
Inheritance
Variation and Evolution
Application of Reproduction and Genetics
Topic overviewThe Human Genome Project, other sequenced genomes and genomics in healthcareScreening embryos, stem cells and the ethical issuesGenetic fingerprinting, PCR and electrophoresis in forensic workRecombinant DNA and the production of human insulinGenetically modified crops and gene therapy
Adaptations for Gas Exchange
Topic overviewSurface area to volume ratio and gas exchange in small organismsSpecialised respiratory surfaces and the need for ventilationGills and counter current flow in bony fishThe human breathing system and its histologyVentilation and gas exchange in humansThe insect tracheal systemThe angiosperm leaf, stomata and gas exchange
Adaptations for Transport
Topic overviewVascular systems compared across animal groupsThe mammalian heart and blood vesselsThe cardiac cycle and its controlBlood, haemoglobin and dissociation curvesThe Bohr effect, chloride shift and tissue fluidThe root and the uptake of waterThe endodermis and the entry to the xylemXylem, transpiration and cohesion-tensionThe potometer and xerophytes and hydrophytesPhloem and translocation
Adaptations for Nutrition
Homeostasis and the Kidney
The Nervous System
Immunology and Disease: Disease and Its TransmissionImmunology
Immunology and Disease: AntibioticsImmunology
Immunology and Disease: The Immune ResponseImmunology
Human Musculoskeletal Anatomy: Skeletal TissuesMusculoskeletal
Topic overviewCartilage and its three typesThe composition and functions of compact boneBone remodelling and the Haversian systemRickets, osteomalacia, osteoporosis and brittle bone diseaseThe structure of skeletal muscleThe sliding filament theoryFast and slow twitch fibres, and energy for contraction
Human Musculoskeletal Anatomy: Structure and Function of the SkeletonMusculoskeletal
Human Musculoskeletal Anatomy: JointsMusculoskeletal
Neurobiology and Behaviour: The BrainNeurobiology
Neurobiology and Behaviour: NeuroscienceNeurobiology
Photosynthesis
Nitrogen, magnesium and plant growth
- 3 things to know
- Component 1
Overview
Four kinds of compound in a plant that contain nitrogen, why a shortage of nitrogen stunts a plant's growth and visible symptoms of nitrogen deficiency.
What you need to know
Answer each one before you reveal it.
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Key term
Name four kinds of compound in a plant that contain nitrogen.
Key term
Explain why a shortage of nitrogen stunts a plant's growth.
Questions from this subtopic
Each one with the model answer underneath.
- 1
In what form does a plant absorb nitrogen from the soil?
Model answer
As nitrate ions, and to a smaller extent as ammonium ions, taken up by active transport into the root hairs.
- 2
Name four kinds of compound in a plant that contain nitrogen.
Model answer
Amino acids and proteins, nucleic acids, ATP and chlorophyll.
- 3
Explain why a shortage of nitrogen stunts a plant's growth.
Model answer
Without nitrogen the plant cannot make amino acids, so proteins including enzymes and the structures needed for cell division cannot be built.
- 4
Describe the visible symptoms of nitrogen deficiency.
Model answer
The plant is small with a weak, spindly shoot, and its older leaves turn pale green and then yellow while the young leaves stay greener.
- 5
In what form does a plant absorb magnesium?
Model answer
As magnesium ions, Mg²⁺, from the soil solution.
- 6
Why does a plant need magnesium?
Model answer
Magnesium sits at the centre of every chlorophyll molecule, and it also activates a number of enzymes including those of the Calvin cycle.
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