Practice question

Question

Directions For Questions
Read the passage given below and answer the questions that follow:
(1) Photosynthesis is the process that plants use to convert sunlight into the food that they need to survive and grow. Most plants create some form of sugar from the sunlight, and this sugar is used by the plant as its primary food source.
(2) Plants actually need only three things to create this sugar: sunlight, carbon dioxide, and water. The sunlight reacts with the plant’s chlorophyll, a green chemical which is used to convert water and carbon dioxide into sugar.
(3) As a general rule, photosynthesis occurs in a plant’s leaves. The leaf contains chlorophyll, which reacts when sunlight strikes the leaf. It is also the chlorophyll which gives the leaf its typical green color, since photosynthesis absorbs most light rays except green, which are reflected outwards.
(4) The process of photosynthesis produces more than just sugar, however. One byproduct of the process is oxygen, which is “exhaled” by the plant into the atmosphere. In fact, plant photosynthesis is one of the primary sources of oxygen generation on our planet, making plant life essential to almost all living things on earth.
According to paragraph 4, which of the following is a byproduct of
photosynthesis?