The correct answer is option (d) They allow the exchange of gases between cells in the leaf and the external environment.
Stomata are the tiny openings present in the epidermis (outer layer of cells) of the leaf. They have a pore which is guarded by the guard cells which controls the opening and closing of the stomata. Air enters and exits through the stomata.
The main funtion of stomata is to facilitate the gaseous exchange. The gas exchange that occurs when the stomata are open helps in the process of photosynthesis. During photosynthesis, carbon dioxide is taken in from the atmosphere and oxygen is released as a by-product of photosynthesis. The glucose produced is converted into the starch and stored in the leaves.
Also, water vapour diffuses through the stomata into the atmosphere by a process called the transpiration.
Thus, stomata are the structures that are mainly involved in the gaseous exchange between the cells of the leaf and the atmosphere.
Answer:
A cell cycle is a series of events that takes place in a cell as it grows and divides
Explanation:
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Three nonpolar molecules that are used in everyday live are carbon dioxide (CO2), methane (CH4), and ethylene (C2H4).
Ethylene is used to make plastic and ripen fruits and methane is used to produce electricity and power garbage trucks. Besides its usage in the crucial processes of photosynthesis and cell respiration that keep us alive, carbon dioxide is important in refrigeration and is also found in fire extinguishers.
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Answer:II) Deforestation and suburbanization reduce an area's net primary productivity.
III) Increasing atmospheric concentrations of carbon dioxide could alter Earth's climate.
IV) By using fossil fuels we are destroying a nonrenewable resource.
Explanation:
The global carbon cycle can be defined as the cycle of carbon in which the carbon is transformed and changed into forms while transferring to atmosphere, land, ocean and in the form of fossil fuels.
The deforestation and suburbanization processes will likely to affect the contribution of the plant in the net primary productivity generate due to photosynthesis process that involves the production of carbon products in the form of glucose by atmospheric carbon dioxide.
The increase in atmospheric concentration of carbon dioxide through the burning of fossil fuels is likely to warm the earth climate. The burning of fossil fuel is likely to increase the abundance of carbon dioxide in the air.
The fossil fuels are the source of non-renewable resource utilized for the purpose of generation of thermal energy. These resources once consumed will not get replenished thus this will reduce the carbon level produced due to burning of fossil fuels in the future.
