In photosynthesis, light energy is eventually stored in chemical bonds in ATP and NADPH molecules. The formation of these two compounds
a. occur in the light independent reactions.
b. occur as phosphate groups are attached.
c. require carbon dioxide as an input into the cycle.
d. require energy from an electron transport system.1 AnswerBiology4 months ago
A rocket is launched off the top of a school. The flight of the rocket can be modelled by the quadratic equation, H(t) = -2t2+19t+6, where t represents the time in seconds, and H(t) represents the height of the rocket at time t. To the nearest whole second, how long was the rocket in the air for?4 AnswersMathematics1 year ago
A rocket is launched off the top of a school. The flight of the rocket can be modelled by the quadratic equation, H(t) = -4t2+22t+5, where t represents the time in seconds, and H(t) represents the height of the rocket at time t. To the nearest whole metre, how high is the rocket after 1 second?3 AnswersMathematics1 year ago
a) Describe the relative numbers of producers, primary consumers, secondary consumers, and tertiary consumers expected in an ecosystem based on the food chain.
b) Describe the shape that this pyramid of numbers would take.
c)If you were to include decomposers in the food chain above, where would you place them? Explain your answer.3 AnswersBiology1 year ago
Which of the following human activities disrupt the phosphorus cycle and have negative effects on an ecosystem?
a. Soaps and laundry detergent enter the water supply.
b. Farmers use crop rotation to maintain nutrients at high levels in the soil.
c. Fossil fuels are extracted from deep in the ground, releasing nutrients stored in bedrock.
d. both a and c
All the biogeochemical cycles (nitrogen, phosphorus, oxygen, and carbon) include water and plants.
1.What are the properties of water that make it important in all cycles?
2.Plants are important in all of these cycles in various ways. List 2 different roles that plants play in these cycles.
Phosphorus is an element that differs in its matter cycle from the nitrogen and carbon cycles because
a. the gas state of its compounds is too dense
b. it does not involve the atmosphere
c. it is not transported in fluid systems
d. it is more complex in its mineral ore configuration
Nitrogen-deficient plants present a problem for healthy food webs because animals then will lack nitrogen. Nitrogen is important for all animals because
a. they need it to build structures of protein and to make genetic molecules (DNA)
b. bacteria in their stomach use it for ammonification
c. it is a major component of bones and teeth
d. it is the main energy source for movement and cell processes
One way of representing the structure of an ecosystem is through ecological pyramids. Ecological pyramids represent the amount of organisms, biomass or energy at each tropic level, which most often is in a pyramidal shape. Why are most visual representations of ecosystems in the shape of a pyramid?
a. At each trophic level, energy is lost (as heat) in the transfer of energy from one trophic level to another.
b. Very large carnivores (for example, sharks) have the most energy available.
c. Producers use a low amount of sunlight and produce a low amount of energy for all other organisms.
d. The large number of primary consumers supplies a large amount of energy for fewer herbivores.
All the following are correct matches of an ecological term with an example except
a. herbivore - grasshopper
b. tertiary consumer - mice
c. first trophic level - grasses
d. producer - grain
A decrease in the number of producers at the first trophic level affects the number of herbivores in the second trophic level resulting in
a. more energy transferred and a rise in herbivore populations
b. more energy transferred and a decrease in herbivore populations
c. less energy transferred and a rise in herbivore populations
d. less energy available for herbivores and a decrease in herbivore populations
The principal food source for moose is buds of willow and hazelnut shrubs. In some years, moose are severely infected with ticks. A high density of ticks can cause the death of a weakened moose.
The correct food chain described above is
a. ticks rightwards arrowmoose rightwards arrowbuds
b. sun rightwards arrowbuds rightwards arrowticks
c. buds rightwards arrowmoose rightwards arrow ticks
d. sun rightwards arrow moose rightwards arrow tick
the Sun's incoming solar radiation is stronger at the equator than at the Earth's poles. What effect might this have on ecosystems at the equator and in the northern hemisphere?
a. The total energy in the ecosystem at the equator will be higher due to more incoming radiation and more photosynthetic activity.
b. As a result of the incoming radiation, less energy will be lost as it is transferred between tropic levels in the ecosystem at the equator.
c. The ecosystems will have the same total energy because the plants at the equator will not trap as much energy as the plants at the northern hemisphere.
d. all of the above
The process by which organisms can harness energy for storage without sunlight is
c. nitrogen fixation
The term albedo is used to describe the extent to which a material can reflect sunlight. Which of the following statements about albedo is correct?
a. The lower the albedo, the greater is the absorption of sun energy.
b. The higher the albedo, the greater is the absorption of sun energy.
c. The lower the albedo, the greater is the reflection of sunlight.
d. The higher the albedo, the less is the ability to reflect sunlight.3 AnswersBiology1 year ago
I really need help on this, i dont get it. If the rate of photosynthesis on Earth doubled, what effect would it have on our atmosphere?
a. The amount of oxygen in the atmosphere would increase and the amount of carbon dioxide would decrease.
b. The atmospheric composition would remain the same as it is now.
c. The amount of carbon dioxide in the atmosphere would increase and the amount of oxygen would decrease.
d. The amount of carbon dioxide and oxygen would decrease.
I really need help on this one im studying for my final. Two abiotic factors (other than available nutrients) that limit productivity are:?
a. moisture and sunlight
b. disease and herbivores
c. trace elements and molds
d. parasites and fungi