Question

multiple choice

1. which process in the carbon cycle converts carbon dioxide into organic matter?

a. cellular respiration
b. decomposition
c. photosynthesis

1. what is the main source of carbon for plants during photosynthesis?

a. carbon dioxide in the atmosphere
b. carbon dioxide dissolved in water
c. carbon in the soil

1. what happens to carbon during cellular respiration?

a. it is converted into organic matter.
b. it is released back into the atmosphere as carbon dioxide.
c. it is absorbed by plants for respiration.

1. how do oceans contribute to the carbon cycle?

a. by releasing carbon dioxide into the atmosphere
b. by absorbing carbon dioxide from the atmosphere
c. by converting carbon dioxide into organic matter

1. how do sedimentary rocks contribute to the carbon cycle?

a. by absorbing carbon dioxide from the atmosphere
b. by storing carbon over long periods of time
c. by converting carbon into organic matter

Explanation:

For question 8: Photosynthesis uses carbon dioxide and water to produce organic matter (glucose) and oxygen. Cellular respiration releases carbon dioxide. Decomposition breaks down organic matter but doesn't convert carbon dioxide to organic matter.
For question 9: During photosynthesis, plants take in carbon dioxide from the atmosphere as their main carbon source. Carbon in soil is more relevant for nutrient uptake in other processes. Carbon dioxide dissolved in water is more for aquatic plants but the main source for most land - plants is atmospheric.
For question 10: In cellular respiration, glucose (organic matter) is broken down, and carbon is released as carbon dioxide. Conversion of carbon dioxide to organic matter is photosynthesis. Plants absorb carbon dioxide for photosynthesis, not respiration.
For question 11: Oceans absorb a large amount of carbon dioxide from the atmosphere. Releasing carbon dioxide is a smaller part compared to absorption. Conversion of carbon dioxide to organic matter is mainly done by phytoplankton (a form of photosynthesis) but the more general contribution is absorption.
For question 12: Sedimentary rocks store carbon over long periods (e.g., limestone has carbonates). Absorbing carbon dioxide from the atmosphere is more of a short - term process in the carbon cycle for things like plants. Conversion to organic matter is biological processes like photosynthesis.

Answer:

1. C. photosynthesis
2. A. carbon dioxide in the atmosphere
3. B. It is released back into the atmosphere as carbon dioxide.
4. B. by absorbing carbon dioxide from the atmosphere
5. B. by storing carbon over long periods of time