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- Question
Biogeochemical cycles are crucial to ecosystem function because
Options- A. they keep the planet warm enough for living things to survive
- B. energy flows through ecosystems in one direction only and is eventually dissipated as heat
- C. they prevent catastrophic extinctions
- D. nutrients and other life-sustaining molecules are in limited supply and must be continually recycled
- Correct Answer
- nutrients and other life-sustaining molecules are in limited supply and must be continually recycled
ExplanationBiogeochemical cycles are crucial to ecosystem function because ::
1. Chemical elements are available in only limited amounts and must be recycled.
2. Nutrients and other life-sustaining molecules are in limited supply and must be continually recycled.
- 1. Which process removes carbon dioxide from the atmosphere?
Options- A. Combustion
- B. Photosynthesis
- C. Respiration
- D. All of the above Discuss
- 2. What is the science of mapmaking called?
Options- A. Coriography
- B. Cartography
- C. Photograrnmetry
- D. Mapping Discuss
- 3. Which of the following statements describes the glycemic index of foods?
Options- A. the extent to which a given food raises blood glucose and insulin levels
- B. the amount of insulin required to metabolize 100 grams of glucose
- C. an individual?s glucose/insulin ratio in a fasted state
- D. the glucose content of a given food Discuss
- 4. Which of these is an example of negative feedback?
Options- A. After you eat, insulin stimulates the lowering of blood sugar levels.
- B. Once labor begins, contractions increase in frequency and intensity.
- C. After you eat, glucagon stimulates an increase in blood sugar levels.
- D. As a blood clot begins to form, the process of its formation gets faster and faster. Discuss
- 5. Plant cell walls consist mainly of
Options- A. Chitin
- B. peptidoglycan
- C. cellulose
- D. chlorophyll Discuss
- 6. Which of the following is a function of the geosphere?
Options- A. providing a moderate, livable climate
- B. serving as the interface between the other spheres
- C. facilitating the movement of water through spheres through transpiration
- D. facilitating the process of photosynthesis Discuss
- 7. Photosynthesis contributes to plant growth by
Options- A. taking in carbon dioxide and making carbohydrates (sugars)
- B. converting sugar to oxygen and water
- C. taking in oxygen and making wood
- D. synthesizing carbon dioxide and making cellulose Discuss
- 8. Which of the following statements about water is false?
Options- A. There is extensive intramolecular hydrogen bonding in the condensed phase.
- B. Water is oxidized to oxygen during photosynthesis.
- C. Ice formed by heavy water sinks in normal water.
- D. Water can act both as an acid and as a base. Discuss
- 9. The main products of photosynthesis are
Options- A. Oxygen
- B. Sugar
- C. Both A & B
- D. Carbon dioxide Discuss
- 10. Which type of doctor specializes in teeth and jaw alignment?
Options- A. Orthodontist
- B. Pediatrician
- C. Psychiatrist
- D. Oncologist Discuss
General Science problems
Search Results
Correct Answer: Photosynthesis
Explanation:
Photosynthesis process removes carbon dioxide from the atmosphere. Green plants remove carbon dioxide from the atmosphere by photosynthesis.
The level of carbon dioxide in the atmosphere is maintained by several processes, including photosynthesis, respiration and combustion.
Correct Answer: Cartography
Explanation:
The art and science of map making is called Cartography.
Correct Answer: the extent to which a given food raises blood glucose and insulin levels
Explanation:
The glycemic index or glycaemic index is a number associated with the carbohydrates in a particular type of food that indicates the effect of these carbohydrates on a person's blood glucose (also called blood sugar) level. A value of 100 represents the standard, an equivalent amount of pure glucose.
The GI represents the rise in a person's blood sugar level two hours after consumption of the food.
Correct Answer: After you eat, insulin stimulates the lowering of blood sugar levels.
Explanation:
Eating raises blood sugar levels, insulin stimulates the lowering of blood sugar level. In this example the response to the stimulus (increased blood sugar levels) opposes that stimulus (by lowering blood sugar levels).
Correct Answer: cellulose
Explanation:
Plant cell walls are mostly made up of the molecule cellulose. Cellulose is a polysaccharide, a complex sugar made of long chains of glucose.
The cell wall must be made of thick and strong material as it provides the structural shape of the plant and protection from insects and microorganisms.
Correct Answer: serving as the interface between the other spheres
Explanation:
The geosphere is the earth's solid rock or rigid outer layer known as the crust. Without the geosphere it would not be possible for humans to live on the planet. The function of the geosphere serving as the interface between the other spheres.
Correct Answer: taking in carbon dioxide and making carbohydrates (sugars)
Explanation:
Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that can later be released to fuel the organisms activities.
Correct Answer: There is extensive intramolecular hydrogen bonding in the condensed phase.
Explanation:
Water possess intermolecular hydrogen bonding in the condensed phase.
Hence, the given statement 'There is extensive intramolecular hydrogen bonding in the condensed phase.' about water is FALSE.
Correct Answer: Both A & B
Explanation:
The two main products of photosynthesis are sugar and oxygen. Oxygen is emitted as waste product and sugar is used for energy preparation using sun light.
Correct Answer: Orthodontist
Explanation:
An orthodontist is the type of doctor that specializes in teeth and jaw alignment. When the teeth don't align properly, it can cause uneven wear in the teeth.
The jaw is a hinge joint. Strong muscles in the face open and close the jaw. Teeth are implanted in the jaw and serve to rip, tear and crush food in preparation for swallowing it.
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