Statistics for PEA life TRUE/FALSE

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General Stats

This quiz has been taken 79 times
The average score is 38 of 50

Answer Stats

Question	Answer	% Correct
the doubling in cereal yield that was achieved from 1960 to 2000 can be attributed solely to genetic improvement.	False	90%
tropical rainforest trees generally have deep roots for support and to capture nutrients that are leached downwards by the high rainfall.	False	90%
a pioneer plant species is one that can colonise bare rock.	True	87%
deforestation can potentially alter climate by changing surface albedo.	True	87%
the passage of water from the root hairs to the xylem involves both the symplastic (within cells) and apoplastic (between cells) pathways.	True	87%
plant species richness is generally higher in cold deserts as opposed to hot deserts.	False	83%
even in lakes in which the phytoplankton are limited by nutrients, the marginal reed beds may have high productivity.	True	83%
ruderal planets such as dandelions are adapted to high disturbance, low stress habitats.	True	83%
a reduction in transpiration surface helps plants adapt to arid conditions.	True	83%
plants in the tundra can maximise their photosynthetic rate by reducing their low temperature optima.	True	83%
the endosymbiosis of photosynthetic bacteria is believed to have given rise to the first photosynthetic eukaryotes.	True	83%
in general, dehydrated leaves are less prone to freezing injury than fully turgid leaves.	True	83%
nitrogen fixation occurs symbiotically in root nodules of peas, beans and some woody plants.	True	83%
water flows from regions with higher (nearer to 0) water potential to regions with lower water potential (more negative).	True	83%
in general, annual plants avoid rather than resist, low temperature stress.	True	83%
herbaceous woodland species such as bluebell tend to produce relatively large numbers of small seeds.	True	83%
dissolved solutes increase water potential.	False	80%
perennial species allocate more resources to reproduction than annual species.	False	80%
selenium is an essential element for plants, but not for animals.	False	80%
dormancy can only be overcome by the passage of time.	False	80%
a stomatal density tends to increase in plants grown at elevated CO2 concentrations.	False	80%
the first vascular plants appeared on land about 600 million years ago.	False	80%
water moves from the root to the shoot through a pipeline (the xylem) made up from dead lignified cells.	True	80%
the state of stability found at the end of a secondary succession is called a climax community.	True	80%
domesticated plants were thought to have arisen in 'Vavilov centres' during 9000-1500BC.	True	80%
the rate of CO2 diffusion in water is considerably higher than that in the air.	False	77%
in the tundra, annual herbs and large shrubs tend to dominate the vegetation.	False	77%
SO2 remains the dominant air pollutant affecting air pollution across Europe.	False	77%
carbon in forest ecosystems is concentrated above ground while in grassland ecosystems it is generally concentrated below ground.	True	77%
plant cell expansion is driven by an increase in turgor.	True	77%
ecological succession is the process of plant communities replacing one another through time.	True	77%
high silica content can protect grasses from mammalian herbivory.	True	77%
in general plants resistant to chilling injury have a lower proportion of saturated: unsaturated fatty acids in membrane lipids compared to chill sensitive plants.	True	77%
the plant cuticle is freely permeable to both water and CO2.	False	73%
carnivorous plants tend to be found in nutrient rich habitats.	False	73%
their is evidence to suggest that terpenes released from coniferous trees in warm weather act as a natural form of cloud seeding which can affect climate.	True	73%
as a forest ecosystem ages, the stomatal conductance and photosynthetic rate of the tree species tends to decrease.	True	73%
photosystems I and II are located on the chloroplast boundary membrane.	False	70%
'Kranz' anatomy is not essential for C4 photosynthesis.	False	70%
denitrification rarely occurs in anaerobic, waterlogged soils.	False	70%
if a mature, fully expanded leaf becomes shaded, the chloroplast will re-orientate to maximise light absorption.	True	70%
mycorrhiza fungi can take up heavy metal ions from the soil and concentrate them in the root tissue of the host plant.	False	67%
plant chlorosis caused by mineral nutrient deficiency is always most evident on the youngest leaves.	False	67%
in the middle of the 19th century most CO2 emissions could be attributed to non tropical deforestation.	True	67%
stomata open because K+ ions are actively transported out of the guard cells.	False	63%
oligotrophic lakes show limited plant productivity.	True	63%
the impact of climate change on agricultural yield reduction is likely to impact the tropics rather than the northern hemisphere.	True	63%
the starch content of Panicum increases six-fold when grown under 900ppm CO2 compared with ambient CO2.	True	60%
the monarch butterfly sequesters cyanide from plant tissue then emits small quantities to deter predators.	False	57%
plants from wet habitats generally exhibit lower maximum stomatal conductance than those from dry habitats.	False	43%