Statistics for PEA life MULTIPLE CHOICE

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General Stats

This quiz has been taken 36 times
The average score is 68 of 100

Answer Stats

Question	Answer	% Correct
which of the following are not bryophytes?	stoneworts	94%
most of Britain was covered by glacial ice until approx?	12000 yrs ago	89%
Approx how many species of land plants have been described?	250,000	89%
which of the following gasses is NOT a major contributor to the greenhouse effect?	carbon monoxide	89%
which of the following is usually considered to be a micronutrient?	manganese	89%
aspirin is derived from the bark of which tree?	willow	89%
the vapour pressure of water inside the leaf is equivalent to what relative humidity?	100%	83%
what proportion of dry matter does plant nitrogen make up?	2-4%	83%
how much of the water taken up into plant tissues is retained?	5%	83%
which of these is a key advantage of heliotropism in an arctic plant?	allows seeds to develop in the short summer	83%
leaves of plants with 'Krantz anatomy' perform which type of photosynthesis?	C4	83%
boreal vegetation is typically composed of?	coniferous trees	83%
a corridor linking remnant forest patches is generally thought to be useful for?	conserving biodiversity	83%
sinigrin is a toxic defence chemical characteristically found in?	crucifers	83%
which of the following genera has sticky surface traps?	drosera	83%
which of the following elements may specifically become toxic to plants in anaerobic mineral soils?	iron	83%
the enzyme that fixes N in the root nodules of legumes?	nitrogenase	83%
in legumes the first site of root infection by rhizobium is the?	root hair	83%
plants tend to show a greater stimulation in growth in response to elevated CO2 when?	soil N content level is high	83%
which of the following species has the highest requirement for nitrates?	stinging nettle	83%
which of these characters emerged earliest in the evolution of plants?	stomata	83%
which part of a tomato contains chlorogenic acid, ruin and other chemicals that may reduce larval growth?	trichomes	83%
during what is known as the midday depression of photosynthesis in C3 plants stomata close to prevent?	water stress	83%
which of these crops tends to be more sensitive to ozone pollution?	wheat	83%
a typical stomata aperture, measured as a width of the stomatal pore (in micrometers) would be?	10-15	78%
the current conc of CO2 in the atmosphere in ppm is?	390	78%
a rainforest canopy has a high species diversity of mammals, birds and invertebrates mainly because of?	a complex canopy structure	78%
which process is not associated with photosynthesis?	carbohydrate oxidised	78%
which of the following is exuded by cluster roots of the proteaceae in order to solubilise rock phosphate?	citrate	78%
which of the following is not a major function of calcium?	constituent of chlorophyll	78%
carnivory is an example of?	convergent evolution	78%
which of the following traits is most likely to be found in desert plants?	ephemeral (short lived) flowers	78%
which term is used to describe plants such as Hay-rattle (rhinanthus minor) which can complete their life cycle independent of a host plant?	facultative parasite	78%
ethnobotany utilises three major groups of plant compounds which are?	glycosides, alkaloids, terpenes	78%
evapotranspiration is important to plant survival because?	keeps the leaves cool	78%
under drought stress plants shut down their vital functions in the following order?	leaf growth, stomatal opening, photosynthesis, respiration	78%
in the tropical rainforest epiphytism is an adaption to?	light limitation	78%
the first plants are believed to be the?	liverworts	78%
which of the following nutrients is not mined or non renewable?	nitrate	78%
phenology is the study of?	timing of biological events	78%
which of the following is a feature of the submerged leaves of amphibious plants?	a Carbon Concentrating Mechanism (CCM)	72%
cup shaped parabolic reflecting flowers are characteristic of which environment?	arctic tundra	72%
magnesium is an essential component of?	chlorophyll	72%
chloroplasts and mitochondria are thought to have been derived from bacteria via which process?	endosymbiosis	72%
free floating plants such as duckweed are usually restricted to water that is?	eutrophic	72%
in general, which of the following plant groups exhibit the highest stomatal conductances?	herbaceous crop plants	72%
which of the following is NOT generally a means of drought avoidance?	perennial life cycle	72%
maintaining the genetic diversity of agricultural crops is important in order to?	prevent disease epidemics	72%
tree species gown under elevated CO2 concentrations can protect themselves from predation from invertebrates by?	producing more leaf tannins	72%
wheat plants that suffer from S-deficiency produce flour that is?	reduced in glutathione	72%
the change of plant cover from one type of community to another type is called?	succession	72%
in the leaves of aquatic plants, stomata are generally found on the?	upper surface	72%
water usually comprises how much of the fresh weight of fully turgid non woody plant tissues?	90%	67%
which of the following plant chemicals may inhibit digestion of proteins by herbivores?	alkaloids	67%
a mutualistic interaction is one where?	both organisms involved benefit from the association	67%
photorespiration takes place in the following plant cell components?	chloroplasts, mitochondrion and peroxisome	67%
the principal cause of secondary succession is?	disturbance such as a forest fire	67%
which of the following is least effective in photosynthesis?	green light	67%
in many important food crops, elevated CO2 levels can change above ground tissue quality by?	increasing starch content and decreasing N and protein content	67%
a tree interrupts solar energy in a forest canopy restricting access to this resource for the plants that grow on the forest floor. this is an example of?	interference competition	67%
the range of invasive parasitic crop weed Striga hermenthica (purple witchweed) is predicted to increase in the subtropics as a result of environmental change because?	larger areas of the subtropics will experience temps above the minimum germinate and growth temp of the plant	67%
which of the following environmental conditions tends to result in stomatal closure?	low humidity	67%
in spring the growth of woodland plants such as red campion is predominately limited by?	nutrients	67%
afforestation can have a very powerful drying effect in catchment soils due to?	rainfall interception and evaporation within the canopy	67%
which aspect of plant cell physiology tends to decrease in response to air pollution?	rubisco content and activity	67%
multiple cropping oats or barley with vetch or peas as a mixed forage crop are advantageous because?	the legume enriches the protein of the feed and the cereal supplies the bulk of the carbohydrates and supports the weak stemmed legume	67%
C3 and C4 plants are so called because?	the number represents the number of C atoms present In the first carbohydrate photosynthetic product	67%
the 3 crops with the highest global production are?	cane sugar, maize, rice	61%
the planting of coniferous forests can acidify soils which in turn can lead to?	clear catchment lake water due to precipitation of humid substances	61%
in primary succession, plant colonisation passes through stages called 'seres' until stabilisation- this point is known as the?	climax succession	61%
stomata open at night in CAM plants in response to what internal signal?	decreasing temp	61%
a common function of ethylene is to?	delay senescence	61%
which best describes energy in an ecosystem?	energy in an ecosystem comes from solar energy and enters the trophic pyramid through the producers	61%
what statement bets describes an aspect of heathland?	heathland needs to be managed to prevent succession to woodland and/or invasion by bracken and grassland	61%
pyrethroids in chrysanthemums act as effective?	insecticides	61%
secondary metabolites function in plants by?	making plants unpalatable for herbivores	61%
which of the elemental cycles of carbon, phosphorus, sulphur and potassium do not have an atmospheric component?	potassium and phosphorus	61%
at which of the following stages of development are plants most vulnerable to abiotic stresses?	seedling	61%
the 2 major factors that control the distribution of plants are?	temp and precipitation	61%
globally, what percentage of terrestrial plants are C4 plants?	5%	56%
the plant species richness of a hay meadow tends to be lower when available N is abundant because?	excess N favours competitive species which then dominate and less competitive plants do not thrive	56%
which of the following grassland biomes is only found in southern latitudes?	pampas	56%
wood consists of accumulated?	secondary xylem	56%
the carboxylation processes in C4 plants are?	spatially separated	56%
which carbohydrate is synthesised in chloroplasts and other plastids and not in the cytosol?	starch	56%
a mycorrhizal association is beneficial to both fungal and plant partner because?	the plant provides carbohydrate and the fungus provides P	56%
the boundary between adjacent biomes is called an ecotone. these are important for plant biodiversity because?	they may contain species that are not present in the adjacent biomes	56%
what is the best definition of an ecotype?	individuals adapted to a specific community	50%
what mechanism accounts for accelerated leaf dehydration when plants are concurrently exposed to drought and atmospheric ozone?	ozone renders stomata insensitive to ABA	50%
in plant nutrition, beneficial elects are regarded as those that?	are required for the plant to complete the vegetative state of its lifecycle	44%
cacti and euphorbias are found in deserts and look very similar yet are completely unrelated this is an example of?	convergent evolution	44%
a high leaf boundary layer conductance tends to?	decrease evapotranspiration	44%
the ACi curve is a graph indicating?	intercellular CO2 conc vs net photosynthesis	44%
the two important micronutrients involved in the N fixing ability of root nodule bacteria are?	nickel and manganese	44%
climatic consequences of change of land use from rainforest to pasture or grassland can potentially?	reduce evapotranspiration; increase surface temp; increase albedo	44%
in general, soil phosphate has the highest availability in which soils?	acidic	33%
a north-south transect across the Sahel in Africa, demonstrates a biome shift from tropical rainforest through Savannah to hot desert, this is primarily a result of?	overgrazing and land use due to population pressure	33%
which of the following is more likely to require light for germination?	a small seed eg lettuce	28%
C4 plants are most typical of which of the following habitats?	desert	22%
C3 plants assimilate CO2 at a higher rate at elevated temperature because?	in C4 plants increase rates of photorespiration negatively affect photosynthesis	6%