Living things are chemical systems. 99% of the molecular components of living th

Question

Living things are chemical systems. 99% of the molecular components of living things consist of only 4 elements: carbon, hydrogen, oxygen and nitrogen, all of which are available within the biosphere. Which of these four elements is the connector element that forms long chain molecules? The molecules of living things are built on this element. carbon silicon phosphorus nitrogen What is the principal source of the other vital elements (the remaining 1%) that are needed in much smaller quantities? In the Solar System, Earth is the only planet within the habitable zone, which is defined as that distance from the sun at which the temperature range allows liquid water at the surface. About 70% of the composition of living things is water (H_2O). List two reasons why liquid water is so essential to plants in particular. In a complex series of chemical reactions called photosynthesis, which materials are combined to produce a simple sugar called glucose? What does the process of photosynthesis add to the atmosphere that makes respiration possible?

Explanation / Answer

Question 1) option A) carbon

Reason : Carbon is the only element that can form so many different compounds because each carbon atom can make four chemical bonds to other atoms due to valency of 4

Carbon ability to form long carbon-to-carbon chains is the reason that there can be so many different carbon compounds therefore it is the connector element

Question 3) liquid water is essential for plants for following reasons:

a) for transpiration to take place in plants ( loss of water in plants in the form of vapour )

b) for photosynthesis ( preparation of carbohydrates for growth)

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