Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Ecology Exam 6/7
Chapter 6
| Question | Answer |
|---|---|
| Many plants adapted to arid environments use the ________ photosynthetic pathway to fix CO2 during the night. | CAM |
| The higher rates of diffusion and photosynthesis under elevated atmospheric concentrations of CO2 have been termed the ________. | CO2 fertilization effect |
| A CO2 gradient between the inside and outside of a leaf is maintained during photosynthesis because _________ | the CO2 concentration in the mesophyll is constantly decreasing. |
| All the following are plant adaptations to low temperatures, except a. production of antifreeze molecules. b. shedding leaves at the onset of cold weather. c. increased photosynthetic rate to heat leaves. d. a shifting of Topt. | c. increased photosynthetic rate to heat leaves. |
| An Acacia seedling grown in shade (50% full sun) is expected to have a ________ net assimilation rate (NAR) and a ________ leaf area ratio (LAR) than an Acacia seedling grown in full sun. | lower; higher |
| As temperatures continue to rise, the photosynthetic rate reaches a maximum related to | the temperature response of rubisco |
| CAM plants do what? | fix carbon dioxide during the night |
| Carbon balance focuses on the balance between __________. | uptake of CO2 in photosynthesis balanced with the loss of CO2 during respiration. |
| Compared with a shade-intolerant plant, a shade-tolerant plant _______. | has a greater SLA (specific leaf area) |
| Compared with plants growing in shade, plants growing in sunlight tend to have smaller ________. | Leaves |
| Compared with plants growing in sunlight, plants growing in shade tend to have a greater ________. | specific leaf area. |
| In photosynthesis, the net uptake of CO2 by a plant is greatest ________. | at the light saturation point. |
| In photosynthesis, the uptake of CO2 by plants occurs through openings on the surface of ________. | Leaves |
| In the Calvin-Benson or C3 photosynthetic pathway, the enzyme rubisco catalyzes the reaction called _________ | carboxylation |
| Leaf area ratio (LAR) is the product of specific leaf area (SLA) and ________. | leaf weight ratio (LWR). |
| Net carbon uptake per unit time by a plant is directly related to ______. | the difference between photosynthetic rate and respiration rate. |
| Net photosynthesis is equal to _________. | photosynthesis - respiration. |
| Organisms that derive their energy from sunlight are referred to as ____. | photoautotrophs |
| Overall, water movement from the soil, through plant tissues, and finally to the atmosphere through transpiration, is driven by a gradient of ______. | water potential. |
| Plants adapted to low-nutrient environments are characterized by ________ | increased leaf longevity. |
| Plants can reduce water loss by _______. | closing their stomata. |
| Plants using the C4 photosynthetic pathway __________-. | divide photosynthesis between mesophyll and bundle sheath cells. |
| Submerged aquatic plants can take up CO2 from the water in all of ways, except how? | diffusion through stomata. |
| The C4 photosynthetic pathway is most common in what plants? | grasses and shrubs in warm and dry climates |
| The osmotic potential of a plant refers to the _____. | association between concentrations of solutes in cells and the rate of water loss. |
| The pigment that absorbs light energy (photons) in photosynthesis is ______. | chlorophyll |
| The process of using energy from the Sun to convert CO2 into organic molecules is called what? | photosynthesis |
| The rate of carbon uptake increases only when plants allocate carbon to the production of ________. | leaves and stems |
| The rates of photosynthesis and respiration in a plant are controlled by the temperature in the ____. | leaf |
| The transfer of heat from the plant to the surrounding environment is influenced by the existence of the boundary layer, which refers to the layer of ______. | still air or water adjacent to the surface of a leaf |
| The ultimate source of carbon from which life is constructed is derived from what? | atmospheric carbon dioxide |
| The value of photosynthetically active radiation above which no further increase in photosynthesis occurs is referred to as _____. | the light saturation point |
| Unlike terrestrial plants, submerged aquatic plants lack what? | Stomata |
| Which group of plants responds to increased CO2 with the highest biomass enhancement ratio? | C3 |
| Which of the following conditions is required for the continued movement of water from the soil into and through a plant via transpiration? | ψatm < ψleaf < ψroot < ψsoil |
| Which of the following elements is considered a plant micronutrient? a. oxygen b. iron c. nitrogen d. phosphorus | b. iron |
| Which of the following is an incorrect statement? a. thick leaf reduces loss of water via transpiration. b. deeply lobed leaf minimizes heat exchange w/ atmosphere. c. leaf w/ high SLA is gen. thin and flexible. d. large leaf maxes light interception. | b. deeply lobed leaf minimizes heat exchange w/ atmosphere. |
| Which of the following photosynthetic pathways is ideal for desert plants? a. respiration b. CAM c. C3 d. C4 | b. CAM |
| Why is the SLA higher under shade for both shade-tolerant and shade-intolerant plants? | Leaves tend to have larger surface areas to absorb more sunlight. |
| _________ are openings in the leaves of terrestrial plants that allow for the uptake of CO2. | Stomata |
| _______ is the movement of a substance from areas of higher to lower concentration. | Diffusion |
| _______ is the transfer of heat energy between a solid and a moving fluid. | Convection |
| A plant growing in the shade is expected to have a ________ maximum photosynthetic rate than a plant growing in sunlight. | lower |
| All life is made up of complex molecules built on a framework of ______ atoms | carbon |
| C4 plants divide photosynthesis between two types of cells: the mesophyll and the _______ cells. | bundle sheath |
| In some shade plants, the negative effect of high light levels on the rate of photosynthesis is referred to as _________. | photoinhibition |
| In tropical regions with distinct wet and dry seasons, plants that drop their leaves at the onset of the dry season are termed drought ________ | deciduous |
| Much of the nitrogen taken in by a plant is used to synthesize the molecules rubisco and _______ | chlorophyll |
| Nutrients that are needed by plants in large amounts are called _______ | macronutrients |
| Once dissolved in water, the CO2 molecule reacts with water to form _________- | bicarbonate |
| Plants convert bicarbonate to carbon dioxide using the enzyme carbonic _______ | anhydrase |
| The ability of some plants to tolerate extreme cold is known as ______ | frost hardening |
| The enzyme that catalyzes carboxylation during photosynthesis is called ________ | rubisco |
| The force exerted outward on a plant cell wall by the water contained in the cell is called _____ pressure. | turgor |
| The light level at which the rate of carbon uptake in photosynthesis equals the rate of carbon loss in respiration is the light _____ point. | compensation |
| The measure used to describe the free energy of water at any point along the soil-plant-atmosphere continuum is called its ____ potential. | water |
| The process of photosynthesis in plants occurs in specialized cells within the leaf called _____ cells. | mesophyll |
| The ratio of carbon fixed (photosynthesis) per unit of water lost (transpiration) is called _____ efficiency. | water-use |
| The ratio of surface area to weight for a leaf is called the _____ | specific leaf area |
| The stage of photosynthesis during which chlorophyll absorbs light energy is called the ______ reaction. | light |
| The transfer of heat from the plant to the surrounding environment is influenced by the existence of the _____ layer. | boundary |
| To survive, grow, and reproduce, plants must maintain a ______ carbon balance. | positive |
Created by:
phebe
Popular Ecology sets