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Why is cohesion important in biology?

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Answer
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Hint: Cohesion means unity. It is the intrinsic property of the substance that's caused thanks to the structure and shape of the molecules. When molecules get close to one another it makes the distribution of the surrounding electrons gets disturbed.

Complete Answer:
The force of attraction that’s present in between the 2 similar substances is understood as a cohesive force.
Cohesion force is present in between the water molecules. The effects of cohesion are capillarity, meniscus, and physical phenomenon. It is caused by Van der Waals force and hydrogen bonding. A strong cohesion force is involved in the formation of the water droplets.
One example of understanding the cohesion theory is the water molecule. Water may be a highly cohesive liquid, it clumps together to make drops thanks to its cohesive properties. The positive and negative charges of the hydrogen and the oxygen molecules make them get attracted to each other.
Cohesive force meaning may be a generally used term to represent the collective intermolecular forces that are liable for the majority property of the liquids. And usually, these forces exist in between the molecules that are present in the same substance.
It is the cohesive force of water molecules that helps plants and tree roots to suck the water molecules from the ground and transport them to heights.
Animals are also able to regulate their body temperature because of the cohesive property of water molecules as it increases the boiling temperature of the water.
Cohesion also allows the development of surface tension, which is the capacity for any substance to withstand the tearing/disruption/blowout under the stress or tension condition.

Note:
Cohesion or cohesive forces are very important as they can show the effects of capillary action, meniscus, and surface tension. It clumps together the molecules in order to the proper functioning of the molecules and allows them to withstand disruption. Cohesion has the most important role in holding the water molecules together through capillary action plants are able to transport water from roots to other parts and photosynthesis and all other important processes can happen.