Topic 5 SNAB cards

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Suggest reasons why 95% of the light hitting the surface of a leaf is not used by the chloroplasts.
*Reflection; *incorrect wavelength/colour/ frequency; *light doesn’t hit the chloroplast/ chlorophyll, it is transmitted; *light being in excess e.g. at max. photosynthesis so no more light can be used.
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Describe the structures in a chloroplast that are involved in the LD reactions
The LD reactions involve the *thylakoids that are arranged into stacks of granum. *The grana are connected by lamellae. The *thylakoid membrane contains electron carriers, proteins and *photosynthetic pigments such as chlorophyll which are *arranged
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Explain how the energy from light is made available in ATP molecules for the synthesis of organic materials
The light dependent reactions occur in the thylakoids *in the granum in *accessory pigments such as chlorophyll. The process begins when *light energy raises the energy level of two electrons so that they are excited, the electrons are then *released
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Explain how oxygen is produced during the light-dependent reactions of photosynthesis.
Using *energy from light the *photolysis *of water occurs that produces/releases oxygen
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Explain why the light-independent stage cannot take place without the light-dependent stage
Because the *products of the light-dependent stage are needed for/used in the light-independent stage/Calvin cycle. *Thee products of the light-dependent stage are reduced NADP and ATP, *rNADP is used in the reduction GP/carbon dioxide whilst *ATP is
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Suggest why the development of plants depends on the rate of carbon fixation
*Carbon fixation produces {GP / eq}, this *product is converted to glucose/ starch/ eq. *The faster the C- Fixation the faster the glucose/ starch production, as the *rate of growth of a plant is dependent on the rate of C-Fixation, if this increases
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Suggest how GALP may be used to synthesise cellulose.
*GALP is a 3C molecule that is used in the formation of *glucose a 6C sugar. *This synthesis involves enzymes; to make cellulose enzymes are also needed. *Cellulose consists of ß-glucose molecules that are joined by *1-4 *glycosidic bonds in *conden
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The rate of carbon fixation is higher at 25°C than at 14°C for each of the six varieties of maize. Suggest an explanation for this
Temperature change affects the kinetic energy/movement of molecules/particles *therefore this effects number of collisions/enzyme-substrate complexes.
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Suggest one reason why some countries may decide to drain their marshy peat lands for the production of biofuels.
Producing Biofuels may increase the *country’s income as they can *export more fuel and *import less fossil/biofuels; the production of biofuels will also make *more jobs available to the general public. *Biofuels are also renewable whereas *fossil f
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Suggest how scientists could use available data to predict future climate change
Scientists could *extrapolate data *to use for modelling/investigation of correlations to help* provide evidence for global warming. *Using this data along with other sources will increase the predictions reliability
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Scientists have estimated that…….. will reduce CO2 production. Suggest why the …… may be supported by organisations that are concerned about global warming.
*The idea will result in less carbon dioxide (or methane), *which are both greenhouse gases/ cause the greenhouse effect *as they absorb/ trap heat/ infrared/ longer wavelengths (of radiation) *reflected from the Earth. *A reduction in these gases (C
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Suggest why an increase in temperature may cause an increase in NPP.
*The rate of (bio)chemical/metabolic/photosynthetic reactions increases due to an *increase in movement/kinetic energy of enzyme/substrate/molecules; *thus increasing the reaction rate because of more enzyme substrate interaction/ collisions.
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Suggest why/ how a community changes over time.
*Lichens and mosses enter as the pioneer community; *they are able to grow in little/no soil and *will break up (rock) fragments, with their roots, to form thin/shallow soil *which is able to retain some water/minerals. *Then short-rooted plants ente
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Why is a climax community stable?
*A climax community is where (both) animals and plants are present/has many species/has high biodiversity; *there will be interaction between these species but they *will have reached a balanced equilibrium of species. *There may be a (co)dominant pl
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Explain why there is likely to be a greater genetic diversity in a hybrid plant than in two separate species.
Because there are *different alleles in each of the two populations as *each population/ species is adapted to living in different environmental conditions. *This means that there will be different mutations in each population. *In a hybrid the allel
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Other cards in this set

Card 2

Front

Describe the structures in a chloroplast that are involved in the LD reactions

Back

The LD reactions involve the *thylakoids that are arranged into stacks of granum. *The grana are connected by lamellae. The *thylakoid membrane contains electron carriers, proteins and *photosynthetic pigments such as chlorophyll which are *arranged

Card 3

Front

Explain how the energy from light is made available in ATP molecules for the synthesis of organic materials

Back

Preview of the front of card 3

Card 4

Front

Explain how oxygen is produced during the light-dependent reactions of photosynthesis.

Back

Preview of the front of card 4

Card 5

Front

Explain why the light-independent stage cannot take place without the light-dependent stage

Back

Preview of the front of card 5
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habdulhussain

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how about  typing the entire answer on  the back?

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