Photosynthesis Experiment

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the role of chlorophyll in photosynthesis?

To absorb carbon dioxide

To release oxygen

To release starch

To absorb energy from sunlight (correct)

Desert plants take up carbon dioxide during the day for photosynthesis.

False

What happens to the starch in a plant when it is kept in a dark room for three days?

All the starch gets used up.

The energy absorbed by chlorophyll is used to act upon an intermediate prepared at _______________________.

night Signup and view all the answers

What is the purpose of keeping a potted plant in sunlight for six hours in Activity 5.1?

To allow the plant to undergo photosynthesis Signup and view all the answers

Chloroplasts are found in all cells of a leaf.

False Signup and view all the answers

Match the following components with their roles in photosynthesis:

Chlorophyll = Absorbs energy from sunlight Carbon dioxide = Used to produce glucose Starch = Stored energy in plants Oxygen = Released as a byproduct Signup and view all the answers

What is the purpose of dipping the leaf in boiling water and then in alcohol in Activity 5.1?

To remove the starch from the leaf. Signup and view all the answers

What is the purpose of sealing the bottom of the bell-jars with vaseline in the experiment?

To make the jar air-tight Signup and view all the answers

Photosynthesis can occur in the absence of sunlight.

False Signup and view all the answers

What is the essential element used in the synthesis of proteins and other compounds in plants?

Nitrogen Signup and view all the answers

Plants take up water from the soil through their ______.

roots Signup and view all the answers

Match the following elements with their functions in plants:

Nitrogen = Synthesis of proteins and other compounds Phosphorus = Synthesis of chlorophyll Iron = Transportation of water Magnesium = Synthesis of ATP Signup and view all the answers

What is the primary function of sunlight in photosynthesis?

To provide energy for photosynthesis Signup and view all the answers

Heterotrophic organisms can synthesize their own food.

False Signup and view all the answers

What is the role of chlorophyll in photosynthesis?

To absorb light energy Signup and view all the answers

Photosynthesis occurs in the absence of sunlight.

False Signup and view all the answers

What is the purpose of storing carbohydrates in the form of starch in plants?

To serve as an internal energy reserve to be used as and when required by the plant. Signup and view all the answers

During photosynthesis, carbon dioxide and water are converted into _______________ in the presence of sunlight and chlorophyll.

carbohydrates Signup and view all the answers

Why is sunlight necessary for photosynthesis?

To provide energy for the conversion of carbon dioxide to carbohydrates Signup and view all the answers

Plants can produce their own food in the absence of sunlight.

False Signup and view all the answers

Match the following components with their roles in photosynthesis:

Chlorophyll = Absorbs light energy Water = Provides hydrogen for carbohydrate synthesis Carbon dioxide = Provides carbon for carbohydrate synthesis Sunlight = Provides energy for carbohydrate synthesis Signup and view all the answers

How do plants utilize the energy stored in carbohydrates?

To provide energy to the plant. Signup and view all the answers

Study Notes

Photosynthesis and Nutrition

Autotrophic organisms fulfill their carbon and energy requirements through photosynthesis, a process that converts carbon dioxide and water into carbohydrates in the presence of sunlight and chlorophyll.
Carbohydrates are utilized for providing energy to the plant, and excess energy is stored in the form of starch, serving as an internal energy reserve.
Chlorophyll is essential for photosynthesis, and it is present in cell organelles called chloroplasts.

Experiment to Demonstrate Photosynthesis

Cover a plant with a bell-jar, seal the bottom with vaseline, and keep it in sunlight for about two hours.
Pluck a leaf and check for the presence of starch, which indicates photosynthesis has taken place.
Repeat the experiment without potassium hydroxide to demonstrate the importance of sunlight in photosynthesis.

Other Raw Materials for Plant Growth

Water is taken up from the soil by the roots in terrestrial plants.
Nitrogen, phosphorus, iron, and magnesium are essential elements taken up from the soil for building the plant's body.
Nitrogen is taken up in the form of inorganic nitrates or nitrites or as organic compounds prepared by bacteria from atmospheric nitrogen.

Heterotrophic Nutrition

Each organism is adapted to its environment, and the form of nutrition differs depending on the type and availability of food material.
Desert plants take up carbon dioxide at night and prepare an intermediate, which is acted upon by the energy absorbed by chlorophyll during the day.

Importance of Chlorophyll

Chlorophyll is essential for photosynthesis and is present in cell organelles called chloroplasts.
An activity can be performed to demonstrate the importance of chlorophyll, involving a potted plant with variegated leaves, starch, sunlight, and boiling water.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Description

An experiment to demonstrate the effect of potassium hydroxide on photosynthesis in plants. Students will set up an air-tight system with bell-jars and observe the results.