What do greenhouses, glasshouses, and hothouses have in common? They all refer to a facility that controls the environment where specific crops are to be planted and harvested. In countries where harsh weather and climate conditions are manifest, greenhouses have revolutionized the green industry. By use of such a facility, one is able to control certain factors such as heat, temperature, and the like; creating or extending a growing season.
The Benefits of Greenhouses
A greenhouse traps heat and saves it for future use. Being able to grow one kind of plant, say out of season flowering shrubs, regardless of the external weather conditions is the main benefit of having a greenhouse. This in turn leads to the practical benefit of making certain crops, fruits, and flowers available all year round regardless of the season and weather.
A greenhouse gives you more control over the conditions that affect your plants’ growth. It gives you the ability to predict with a certain degree of accuracy how much crop you will harvest, unless of course something goes wrong in any of the various aspects and processes involved in its operations.
Because of these benefits, an enterprising individual can actually supply out of season flowers and crops and thus gain more profits because of it. The predictable plant production of greenhouse also gives a businessman a better handle on his business economics.
Construction of the Greenhouse
The materials commonly used for greenhouses include plastic and glass. These are specially modified materials that allow heat storage. Heat can then be allocated for future use so that the greenhouse can be maintained at a specific temperature all-year-round. Moreover, these structures have little or no openings because the warm air might escape and a drop in the temperature may lead to unfavorable results.
Greenhouse Limitations
Greenhouses need to comply with certain engineering specifications; this requires special design/build skills and specialized materials. Moreover, greenhouses need a lot of maintenance. Unlike normal gardening, greenhouse conditions must be strictly controlled and monitored. There are various systems for heating, cooling, circulation irrigation, and pest control. There may be specialized equipment for seeding, transplanting and potting. A greenhouses production numbers depend largely on how well the owner or the greenhouse operator has been able to maintain it at its optimal working condition.
Greenhouse for Hobbyists
Despite the costs and efforts needed to maintain a greenhouse, there are still a number of gardening aficionados who choose to maintain such facilities. While most people put up greenhouses for business purposes, there are hobbyists who maintain greenhouses for the pleasure of starting their own plants from seeds and cuttings, or to grow loved plants that would not survive the local climate outdoors. Greenhouses also make it possible for these gardening hobbyists to attend to their plants anytime they wish to do so.
So whether you are getting a jump on the neighborhood “first ripe tomato competition” or you need to extend the growing season for your commercial crop of green peppers. Greenhouses have made greater horticultural success possible.
Mark Sheppler
http://www.articlesbase.com/gardening-articles/thriving-plants-are-the-best-greenhouse-effect-99428.html
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Which of the following best describes the relationship among ?
Which of the following best describes the relationship among population, technology, and resource consumption?
A. A decrease in population and a decrease in technology has led to an increase in resource consumption.
B. A decrease in population and increase in technology has led to an increase in resource consumption.
C. An increase in population and increase in technology has led to an increase in resource consumption.
D. A increase in population and increase in technology has led to an decrease in resource consumption.
2. Which of these energy resources would be least sustainable for a large population?
A. sun
B. water
C. wind
D. coal
3. The amount of land needed to support a person is called his or her
A. nonrenewable resource.
B. renewable resource.
C. carrying capacity.
D. ecological footprint.
4. In addition to particulates, smog contains
A. sunlight.
B. acid rain.
C. ground-level ozone.
D. carbonic acid.
5. How do greenhouse gases affect Earth’s atmosphere?
A. They cool the atmosphere.
B. They heat the atmosphere.
C. They block incoming radiation from the sun.
D. They slow the loss of heat.
6. How can fertilizers used on lawns and fields affect a lake?
A. They can stimulate excess plant and algae growth.
B. They can increase the amount of oxygen in the water.
C. They can prevent biomagnification.
D. They can alter the level of the water in the lake.
7. Pollutants that are fat-soluble
A. are excreted in an organism’s waste.
B. accumulate in an organism’s body.
C. do not pass to the next generation.
D. can be detoxified in water.
8. Which of the following organisms is likely to be most affected by biomagnification of a pollutant?
A. phytoplankton
B. zooplankton
C. fish
D. hawk
9. Which of these is a major cause of extinction?
A. biodiversity
B. loss of habitat
C. the greenhouse effect
D. use of plants for medicine
10. How can introduced species disrupt ecosystems?
A. by causing habitat fragmentation
B. by increasing biodiversity
C. by crowding out native species
D. by decreasing competition
11. Selective cutting of trees instead of clear cutting is an example of practicing
A. old growth forestry.
B. species rotation.
C. sustainable development.
D. gear review.
12. A species whose protection also protects other species is called
A. a sustainable species.
B. an invasive species.
C. an introduced species.
D. an umbrella species.
13. Which of these is a way in which governments can protect ecosystems?
A. setting aside areas as public land
B. cutting down forests
C. increasing fish harvests
D. introducing invasive species
14. Which statement best describes Earth’s human carrying capacity? It is
A. a fixed number that we will soon exceed.
B. increasing due to improved technology and medicine.
C. decreasing due to increasing population.
D. decreasing due to decreasing death rates.
15. Which of the following is an example of the effect of technology on population growth?
A. increased infant mortality
B. increased number of births
C. decreased life expectancy
D. decreased infant mortality
16. Why is smog a more serious problem in the southern United States than in the northern United States?
A. Global warming is worse in the southern United States.
B. Acid rain is worse in the southern United States.
C. Sunlight is more abundant in the southern United States.
D. There are more pollutants in the northern United States.
17. The pH of normal rain is
A. 4.1
B. 4.9
C. 5.6
D. 7.0
18. Scientists agree that changes in atmospheric gases may
A. harm the global geosphere.
B. help the global biosphere.
C. not affect the global biosphere.
D. affect the global biosphere.
19. Why are frogs sensitive to pollutants in water?
A. They have a small body mass.
B. They have water-soluble skins.
C. They are not an indicator species.
D. They need low-oxygen conditions.
20. One large fish consumes many smaller fish that each have a small amount of mercury in their bodies. The mercury accumulates in the large fish. This is an example of
A. biotoxification.
B. bioellimination.
C. biomagnification.
D. bioillumination.
21. Increasing the biodiversity of an ecosystem would be likely to
A. cause some species in the ecosystem to become extinct.
B. reduce the number of species in the ecosystem.
C. increase the ecosystem’s stability.
D. make it harder for the ecosystem to thrive.
22. When an organism’s habitat is divided into segments so that the organim is unable to use the full space, this event is called
A. habitat fragmentation.
B. bioellimination.
C. habitat allocation.
D. bioreorganizing.
23. Burmese pythons introduced in the Eve
1.C
2.D
3.D
4.C
5.D
6.A
7.B
8.D
9.B
10.C
11.C
12.D
13.A
14.B
15.D
16.C
17.C
18.D
19.B
20.C
21.C
22.A
23.A
24.B
25.A
These are all correct because I just got done with that assignment, hope you haven’t already completed it.
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