14 The words in columns I and II have been matched. Which is the correct set of answers?

Column 1 Column 2

oxygen

photosynthesis

carbon dioxide

protection from UV rays

nitrogen

breathing

ozone

found in proteins

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Solution

(A) Oxygen-(III) Breathing
Oxygen is important for living organisms to respire.
Without oxygen living, things will not able to survive.
(B) Carbon dioxide-(I) Photosynthesis
Photosynthesis is the process in which plants make their own food, and oxygen is produced along with it. Plants also consume oxygen for respiration, but they produce more than they consume.
$begin mathsize 14px style stack 6 C O subscript 2 open parentheses g close parentheses with Carbon space Dioxide below plus space stack 6 H subscript 2 O with Water below open parentheses l close parentheses yields with Chlorophyll below and sunlight on top stack C subscript 6 H subscript 12 O subscript 6 with Glucose below open parentheses aq close parentheses plus stack 6 O subscript 2 with Oxygen below open parentheses g close parentheses end style$
(C) Nitrogen-(IV) Proteins
Air is composed of 78% of Nitrogen.
Nitrogen is also a major component of amino acids, the building blocks of proteins.
(D) Ozone-(II)protection from UV rays
The stratosphere extends from the top of the troposphere to about 50 kilometres (31 miles) above the ground.
An ozone layer exists in the stratosphere.
This layer's ozone molecules absorb and alter the Sun's high-energy ultraviolet (UV) light.
Column I Column II
(A) Oxygen (III) Breathing
(B) Carbon dioxide (I) Photosynthesis
(C) Nitrogen (IV) Proteins
(D) Ozone (II) Protection from UV rays

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