Which of the following statements about the carbon cycle is not true?

carbon dioxide used by plants comes from the atmosphere.
plants need carbon to grow.
plants consume carbon through transpiration.
carbon from decomposed plants is a source of fossil fuel.

plants consume carbon through transpiration.

Explanation:

Transpiration is simply a process whereby plant loses water to the environment in form of moisture or vapor. It can happen via the stomata, lenticels or cuticles of plants.

Transpiration has nothing to do with plant's consumption of carbon. Plants fix carbon into their system through the process of photosynthesis during which CO2 in the atmosphere is utilized to synthesize glucose.

Carbon is an important element for all living organisms, hence, plants also needs carbon to grow.

Carbon from decomposed plants is truly a source of fossil fuel. Decayed plants form combustible geologic deposits deeply buried in the soil and ends up forming coal, crude oil, natural gas and other forms of fossil fuel.

Therefore, the only untrue option is the one claiming that plants consume carbon through transpiration.

if two electrons have the same n, the same ℓ, and the same ml, then they are in the same orbital. the pauli exclusion principle states that no two identical fermions (a fancy word for electrons and other subatomic particles like electrons) may occupy the same quantum state in an atom simultaneously.

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure  

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.