Photosynthesis

Photosynthesis

Photosynthesis is the process by which plants, algae, and some bacteria convert light energy from the sun into chemical energy in the form of glucose, a simple sugar. This process is important because it is the basis for most food chains, as plants are the primary producers that provide energy to other organisms. In this process, plants take in carbon dioxide from the air and water from the soil to create their food.

Standard

8.L.18.1 Describe and investigate the process of photosynthesis, such as the roles of light, carbon dioxide, water and chlorophyll; production of food; release of oxygen. (DOK 3)

Multiple Choice

Through the process of photosynthesis, a century plant uses sunlight to make food. The equation below shows this process.

Light Energy + Carbon Dioxide + Water → Glucose + Oxygen

What happens to the light energy that the century plant uses for photosynthesis?

• The light energy is destroyed during the chemical reaction.

• The light energy is released into the atmosphere as water vapor.

• The light energy is transformed into chemical energy in glucose.

• The light energy is transformed into thermal energy and oxygen.

Multiple Choice

Carbon cycles among Earth's air, ground, and organisms. The diagram models part of the carbon cycle. Which of the following best describes the process that occurs at arrow X?

• Plants release carbon dioxide into the air through decomposition.

• Plants take in carbon dioxide from the air to perform photosynthesis.

• Plants release carbon dioxide into the air as a waste product

  of photosynthesis.

• Plants release carbon dioxide into the air as a waste product of

  cellular respiration.

Multiple Choice

Through the process of photosynthesis, a lemon tree uses sunlight to make food. The equation below shows this process.

Light Energy + Carbon Dioxide +Water → Glucose + Oxygen

The carbon dioxide in this equation contains carbon atoms. What happens to these carbon atoms during photosynthesis by the lemon tree?

• They remain part of carbon dioxide molecules.

• They become part of glucose molecules.

• They are destroyed during the reaction.

• They are transformed into light energy.

Multiple Choice

The graph shows change in levels of atmospheric carbon dioxide over time. What might be one way to reverse this trend?

• plant more trees

• use more fossil fuels

• increase rates of deforestation

• human population increase

Multiple Choice

Which of the following correctly combines the organelle with its function during photosynthesis?

• vacuole contains chlorophyll which absorbs nutrients

• chloroplast contains chlorophyll which absorbs sunlight

• mitochondria converts energy into food

• cytoplasm converts food into energy

Multiple Choice

Sara is learning about photosynthesis and cellular respiration in her science class. Which statement can Sara write that BEST explains the relationship between these two processes?

• Plants that use photosynthesis to produce food while animals must consume their food.

• The chemical reactions of photosynthesis and cellular respiration could not take place without each other.

• When cells do not have enough energy for respiration they rely on fermentation.

• Photosynthesis and cellular respiration are both chemical processes.

Multiple Choice

One living plant leaf, still attached to the plant, is placed into a cup and covered with water. A light source is placed so that it shines into the cup on the leaf. In moments, bubbles appear on the surface of the leaf. Which statement explains what causes the bubbles to appear?

• Photosynthesis is occurring and the bubbles of carbon dioxide gas are being released by the plant.

• Photosynthesis is occurring and bubbles of oxygen gas are being released by the surrounding area and absorbed into the plant.

• Photosynthesis is occurring and bubble of oxygen gas are being released from the plant.

• Photosynthesis is occurring and bubbles of air are entering the water from the area around the plant.

Multiple Choice

________ is the process that plants use to make food.

• Respiration

• Photosynthesis

• Chemical reaction

• Carbon dioxide

Multiple Choice

Molecular biologists study ______.

• cell processes

• atmosphere

• weather

• animal behavior

Multiple Choice

What kind of organism was doing photosynthesis before plants?

• Cyanobacteria

• Algae

• Seaweed

• Insects

Multiple Choice

What gives the leaf its green color and absorbs sunlight?

• stomata

• chlorophyll

• roots

• flowers

Multiple Choice

An organism that can make its own food

• autobot

• heterotroph

• autotroph

• heterobot

Multiple Choice

Location inside of a plant cell where the process of photosynthesis occurs.

• nodules

• stomata

• chloroplasts

• chlorophyll

Multiple Choice

A simple sugar that is an important energy source in living organisms

• stevia

• fructose

• glucose

• glycerin