1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Stells [14]
1 year ago
10

Suzanne Simard and colleagues knew that the same mycorrhizal fungal species could colonize multiple types of trees. They wondere

d if the same fungal individual would colonize different trees, forming an underground network that potentially could transport carbon and nutrients from one tree to another (S. Simard et al. 1997. Net transfer of carbon between mycorrhizal tree species in the field. Nature 388: 579-82 ). Pots containing seedlings of three different tree species were set up and grown under natural conditions for three years (Fig. A). Two of the three species (Douglas fir, birch) could form ectomycorrhizal connections with the same fungal species, but the third species (cedar) could not form an ectomycorrhizal connection with the fungal species. In some of the pots, the researchers placed airtight bags over the Douglas fir and birch seedlings and injected carbon dioxide made from carbon-13 into the bags with the Douglas fir and carbon dioxide made from carbon-14 into the bags with the birch. ¹³C and ¹⁴C are different isotopes of carbon that can be detected and measured by researchers.) As the seedlings photosynthesized, the carbon dioxide was converted into sugars that could be tracked and measured by the researchers. The researchers measured whether the sugars in each plant contained only the carbon isotope that was in the air of their plastic bag or also the carbon isotope from the air around the other plant. Simard et al. (1997) further hypothesized that if reciprocal transfer did occur, it would be a source-sink relationship driven by photosynthetic rates. That is, if one seedling is in full sun and the other in deep shade, there will be a net movement of carbon from the seedling in full sun to the one in deep shade. If a shade were placed over the birch seedlings and the cedar, and the Douglas fir was left in full sun, what result could Simard and colleagues expect? A. More ¹³C would be found in the birch than ¹⁴C in the Douglas fir. B. The amounts of ¹³C and ¹⁴C would be equal in the Douglas fir and in the birch. C. The most ¹³C would be found in the cedar. D. The most ¹⁴C would be found in the cedar.
Biology
1 answer:
posledela1 year ago
6 0

A) More 13C would be found in the birch than 14C in the Douglas fir, is the correct option.

<h3>What is Carbon-14?</h3>

Carbon-14 (14C) or radiocarbon, is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.

Its presence in organic materials is the basis of the radiocarbon dating method pioneered by Willard Libby and colleagues (1949) to date archaeological, geological and hydrogeological samples.

Carbon-14 was discovered on February 27, 1940, by Martin Kamen and Sam Ruben at the University of California Radiation Laboratory in Berkeley, California. Its existence had been suggested by Franz Kurie in 1934.

<h3>What is Carbon-13?</h3>

Carbon-13 (13C) is a natural, stable isotope of carbon with a nucleus containing six protons and seven neutrons. As one of the environmental isotopes, it makes up about 1.1% of all natural carbon on Earth.

To learn more about Carbon-13: brainly.com/question/15131632               #SPJ4

You might be interested in
Consider, pea plants, for which green color is dominant to yellow color, and two leaves are dominant to three. A cross between t
Dmitry_Shevchenko [17]

Answer:1339

Explanation:

6 0
3 years ago
What are the causes of respiratory disorders such as bronchitis, pneumonia and lung cancer.?
Dovator [93]

<u>Smoking</u> causes respiratory disorders such as bronchitis, pneumonia and lung cancer.

<u>Explanation:</u>

Respiratory disorders such as bronchitis, pneumonia and lung cancers are caused by smoking tobacco, air pollution and by infection. Smoking is the predominant cause of this respiratory order it also raises the level of air pollution which becomes hazardous to all the living organisms.

Infection in the lungs which is identified as pus in air sacs and found as inflamed lungs is usually life threatening. Severe shortness of breathe called the bronchitis is due to airborne chemicals.

5 0
3 years ago
I need help please?!!!!!
adelina 88 [10]
Skateboard & bicycle.
8 0
3 years ago
Read 2 more answers
How do speed and direction affect velocity?
Firdavs [7]

Answer:

Forces affect how objects move. They may cause motion; they may also slow, stop, or change the direction of motion of an object that is already moving. Since force cause changes in the speed or direction of an object, we can say that forces cause changes in velocity. Remember that acceleration is a change in velocity.

Explanation:

can I have brainliest

5 0
3 years ago
When wind carries pollen to a female cone what occurs
dalvyx [7]
It becomes pollened and therefor more will come afterwards
8 0
3 years ago
Other questions:
  • True or false most proteins have blocked amino and carboxyl terminals.
    6·1 answer
  • The provider performs an open reduction and internal fixation for left fibula and tibia fractures. select the codes.
    12·1 answer
  • Which neurotransmitter does lsd principally operate on? dopamine serotonin acetylcholine norepinephrine?
    13·1 answer
  • What stage of cellular respiration use the high-energy electrons from NADH and FADH2 to form ATP molecules
    13·1 answer
  • How does natural selection support the theory of evolution?
    6·1 answer
  • Endocrine disrupters: are only active in very large doses or exposures only affect the reproductive capability of females affect
    6·1 answer
  • Why does the twilight zone of the ocean have the greatest variation in temperature?
    11·1 answer
  • Explain the structure and functions of DNA. Then discuss how and why the structure helps DNA accomplish the different functions.
    15·1 answer
  • What do you already know about photosynthesis and cellular reputation? (At least three sentences) BRAINLIEST INVOLVED AND
    15·1 answer
  • Carbon is found in all known forms of life.which statement best describes why carbon
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!