BECE - Basic Education Certificate Examination Photosynthesis and Ecosystems Questions and Answers 1

Question 1

Which of the following correctly lists the raw materials needed for photosynthesis?

Accepted Answer

Carbon dioxide and water

Answer

Photosynthesis is the process where plants use sunlight, water, and carbon dioxide to create their own food (glucose) and release oxygen as a byproduct. Therefore, carbon dioxide and water are the essential raw materials.

Question 2

In a food chain, an organism that feeds on plants is known as a

Accepted Answer

Primary consumer

Answer

Producers, like plants, make their own food. Primary consumers are herbivores that get their energy by eating producers. Secondary consumers eat primary consumers, and decomposers break down dead organic matter.

Question 3

A student observes that fallen leaves in a forest eventually disappear. Which group of organisms is primarily responsible for this process?

Accepted Answer

Decomposers

Answer

Decomposers, such as bacteria and fungi, break down dead organic material like fallen leaves. This process, called decomposition, recycles nutrients back into the soil, which are then used by producers.

Question 4

What is the primary source of energy for almost all ecosystems on Earth?

Accepted Answer

The sun

Answer

The sun is the ultimate source of energy for most life on Earth. Plants (producers) capture this light energy through photosynthesis and convert it into chemical energy, which is then transferred through the food web.

Question 5

A food web is a more realistic representation of an ecosystem than a food chain because it shows that

Accepted Answer

most organisms have multiple food sources.

Answer

A food chain shows a single path of energy flow. However, in a real ecosystem, most animals eat more than one type of food. A food web consists of many interconnected food chains and more accurately shows these complex feeding relationships.

(BECE) Basic Education Certificate Examination Practice Test

(BECE) Basic Education Certificate Examination Practice Test

BECE - Basic Education Certificate Examination Photosynthesis and Ecosystems Questions and Answers 1