Photosynthesis
Grade 7 science worksheets.
Every topic or lesson that a tutor teaches has an objective of making the students understand concepts related to the topic. For this, they need assessment tools which allow tutors to measure how well a student has assimilated the theory taught. One of the most basic tools is worksheets.
These grade 7 worksheets on “Photosynthesis” can help both tutors and students alike to review the lesson, get a feedback and eventually improve their respective performances.
Considering the importance of this topic and its significance in learning higher levels of science in the future, it is important that students understand the process and concept of ‘Photosynthesis’ well.
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Photosynthesis is the process by which light energy is tapped and changed into chemical energy in the form of the food sugar. Carbon dioxide is taken in by the plants and oxygen is given out.
Sunlight + carbon dioxide + water = sugar + oxygen
Carbon dioxide and water are combined and their atoms bonds to form a sugar molecule. The bonds of the sugar molecule store the energy gained from light.
The following is the chemical reaction for photosynthesis:
Where does photosynthesis occur?
Photosynthesis is carried out by chloroplasts within the cells of plants. Chloroplasts contain chlorophyll (green color). Chlorophyll absorbs sun’s energy that is sunlight. The photons in light (i.e., the light particles) hit with the electrons in the chlorophyll, which transforms the energy.
A group of bacteria called cyan is originally the chloroplast. This is one of the examples of symbiosis. Here, the cyan bacteria were passed onto upon the host cells as eukaryotic host cells millions of years ago and the method of photosynthesis began. Not only are these ancient symbionts, cyan bacteria which are spread all over the plant in the oceans (three-fourth of the earth’s surface) are responsible for most of the photosynthesis occurring on Earth today.
(Note: A eukaryote is an organism with complex cells, or a single cell which has a complex structure. These cells have the genetic material in the chromosomes in the nucleus of the cell.)
Photosynthesis and the properties of energy
In photosynthesis, light energy is converted to chemical energy and stored in the form of food sugars. The law of conservation of energy is followed that is the amount of light that energy input equals the amount of chemical energy that is the output.
Photosynthesis requires CO2+ Water H2O and sunlight. The processes by which plants and some other organisms like algae capture light energy and use it to make food from carbon dioxide and water.
Chemical equation for Photosynthesis
Glucose is a type of sugar that provides us with energy .
Glucose is needed by all forms of life to produce energy. It is an essential part of the stored food.
The process by which glucose is broken down is called respiration –
During respiration, the chemical energy stored in glucose is converted into other forms of energy, such as mechanical energy or thermal energy.
Plants use some of this energy to grow, reproduce , and perform other life functions. Unused energy is stored as food by the plants.
Plants go through both photosynthesis and respiration.
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Sample Questions
Q1. The process of making food in plants is called
a) Respiration b) Transpiration c) Photosynthesis
Q2. Suzanne is sitting on a garden bench surrounded with lot of plants. Which of these gases is Suzanne likely to inhale the most?
a) Nitrogen b) Carbon dioxide c) Oxygen d) None of the above
Q3. Photosynthesis is the process which takes place in
i) Mitochondria ii) Chloroplast iii) Ribosome
Q4. Life without Photosynthesis would not be possible.
i) True ii) False
Q5. The tubes that bring water from the roots to the leaves are called
i) Xylem ii) Phloem
Q6. Fill in the blanks
i) In photosynthesis, _______________ is changed into chemical energy. ii) The first step in Photosynthesis is _______________ of Sunlight. iii) Products of Photosynthesis are _______________ and _______________
iv ) Identify this Organelle. It is found only in the Plant Cell. Label the parts as – Grana, Stroma and single Thylakoid _______________
Check Point
I. Fill in the blanks –
- Photosynthesis refers to the process by which …………… …………… is tapped and transformed into chemical energy in the form of the ………… ………….
- The bonds within the sugar molecule store the energy obtained from ……………
- Chloroplasts contain ………………….., a lipid that gives plants their …………….. Color.
- The chloroplast is actually derived from a group of bacteria known as………. bacteria.
- The process by which …………… is broken down is called respiration.
II. State True or False –
- Oxygen from water is released as a by-product in this process of photosynthesis.
- light energy + 6CO 2 + 6H 2 O -> C 6 H 12 O 6 + 6O 2
- Photosynthesis is carried out by chromoplasts within the cells of plants.
- The photons in light collide with the neutrons in the chlorophyll molecule, which starts the process of energy transformation.
- Plants only go through photosynthesis.
I.Fill in the blanks –
- Light energy, food sugar
- Chlorophyll, green
II.True or False –
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Home > Science Worksheets > Photosynthesis
Approximately 85% of the world's oxygen is due to this process. That is why if the sun were to suddenly stop producing light, not only would it be dark; we would not be able to breathe much longer. These worksheets explore all aspects of the process of photosynthesis. This collective series of worksheets helps students investigate this process and examine where it happens. We move on to understand the chemistry that takes place in this process and how we have used that knowledge to mimic the process and create our own energy artificially. We also spend a good amount of time understanding the organisms that can perform this much needed activity.
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What is It?
Plant respiration is the opposite of ours, since we breathe out carbon dioxide and plants breathe out oxygen.
What is It? Questions
Different kinds of plants need differing amounts of sunlight and water to thrive.
Photosynthesis and Cellular Respiration
Together, photosynthesis and cellular respirations are the basis of all life on Earth. The oxygen that is released by plants during photosynthesis is used by humans and almost all other organisms for our cellular respiration.
QUESTIONS: Photosynthesis and Cellular Respiration
Which process requires carbon dioxide and gives off oxygen?
Activities like eating and excretion are also part of the carbon cycle, as carbon is being taken into and passed back out of living organisms.
QUESTIONS: Carbon
When we burn these substances, the energy that plants once captured from the sun through photosynthesis is released back out into the atmosphere.
Artificial Photosynthesis
This technology, which is called direct solar water splitting, could also be adjusted in order to turn carbon dioxide back into fuel.
QUESTIONS: Artificial Photosynthesis
Why is producing hydrogen fuel currently hard on the environment?
Photosynthetic Organisms
Prokaryotic organisms are single-celled organisms that do not contain a nucleus.
QUESTIONS: Photosynthetic Organisms
Plants, algae, and cyanobacteria all use the Calvin cycle to fix carbon dioxide.
Anoxygenic Photosynthesis
In this process while sunlight is still used to fix carbon, during the reaction something other than water donates an electron.
QUESTIONS: Anoxygenic Photosynthesis
How is green nonsulfur bacteria different from green sulfur bacteria?
Chloroplasts
Only plants and photosynthetic organisms contain chloroplasts. Simple cells, like those of photosynthetic algae, may only contain several chloroplasts.
QUESTIONS: Chloroplasts
Where exactly within the chloroplast is chlorophyll located?
Light and Dark Reactions
In the first step, sunlight is captured by the chloroplasts when molecules of chlorophyll absorb energy (in the form of sunlight).
QUESTIONS: Light and Dark Reactions
What other methods are there for an organism to use CO 2 to make sugars?
Artificial Light
There are some key differences between sunlight and artificial light. Though artificial lights can mimic the full spectrum of natural light, the energy emitted by an artificial light in the red and blue spectrums does not have as much energy as the red and blue spectrums of natural sunlight.
QUESTIONS: Artificial Light
What kind of light was warm, indoor lighting contain a lot of?
Water and Heat
One of the characteristics of global warming is an increase of carbon dioxide in the air.
QUESTIONS: Water and Heat
How can prolonged stress from drought affect a plant?
How Photosynthesis Works
Photosynthesis is the primary source of oxygen in the Earth's atmosphere. As almost all living forms on the planet need oxygen, life would soon cease to exist without photosynthesis.
Photosynthesis works through a process where plants (as well as algae and cyanobacteria) generate energy from sunlight, water, and carbon dioxide. Oxygen is then released into the atmosphere as a byproduct of the reaction.
All living things on the planet need energy in order to survive. Humans take their food in through their mouths as they eat all types of different things. Plants on the other hand get their energy from the light given off by the sun. Three things need to be present for a plant to be able to undergo photosynthesis this includes: carbon dioxide, sunlight, and water. Plants take the carbon dioxide in through little holes in their leaves called stomata. The plant absorbs water from the soil using roots and gets that water to the rest of the body. As the sunlight passes through the leaves of the plants it travels through ton of chloroplasts found within the leaf. Within those chloroplasts the water molecules are split into hydrogen and oxygen. The oxygen leaves the leaf and the remaining hydrogen and carbon dioxide are used to form glucose which is a usable form of energy for the plant.
The Mechanism of Photosynthesis
As mentioned, the three components essential for photosynthesis are sunlight, carbon dioxide, and water. Together, they transform light energy into chemical energy.
Plants convert solar energy into chemical energy that life forms can use. They also form the basis of the food chain, passing that energy to other species. The beauty of photosynthesis is that oxygen is released as a byproduct of the reaction, filling the atmosphere with the gas all living forms depend on. If you come to think about it, photosynthesis is probably the most important biological process of all.
However, it is important to note that while plants consume carbon dioxide and release oxygen during photosynthesis, they also have respiratory processes during which they do the opposite. About half the amount of carbon dioxide plants consume is released by them as a result of cellular respiration.
Light-Dependent Reactions
Light-dependent reactions happen during the day, as they require a constant supply of light.
Sunlight is absorbed by chlorophyll that is contained in chloroplasts. Chloroplasts are organelles contained in the leaves, and chlorophyll is a ferment that absorbs the energy from red and blue light waves. Chlorophyll also makes plants appear green, as it reflects green light.
Then, the light energy is converted into chemical energy. To perform this stage, plants need water. The light energy is used to start a reaction and split the water molecule, which allows releasing chemical energy in the form of Adenosine Triphosphate (ATP) and Nicotinamide Adenine Dinucleotide Phosphate (NADPH) molecules. While H (hydrogen) later becomes a part of a glucose molecule, O2 (oxygen) is released into the atmosphere as a byproduct.
Light-Independent Reactions
Light independent reactions do not require light streams and thus happen during the night. This stage is also known as the Calvin Cycle .
Carbon dioxide enters the pores called stomata which are usually located at the bottom of a leaf. Then, carbon dioxide molecules are diffused into the stroma, the protein-containing matrix between the thylakoid membranes and the chloroplast membranes.
Stroma is where the rest of the process happens. The chemical energy released during the previous stage in the forms of ATP and NADPH is used to extract carbon from carbon dioxide and later form a glucose molecule. It requires six molecules of carbon dioxide, and therefore six turns of the cycle, to create one molecule of glucose.
A Short Summary of Photosynthesis
Here's a brief overview of the steps involved in photosynthesis to help you quickly grasp how the process works.
- Light is absorbed by chlorophyll, a ferment contained in leaves.
- Light energy is converted into chemical energy: light energy is used to split a water molecule. The reaction releases chemical energy.
- Oxygen is released into the atmosphere as a byproduct of the reaction.
- Carbon dioxide enters through pores called stomata and is moved into a stroma.
- In the stroma, previously released chemical energy is used to extract carbon from carbon dioxide. Carbon is then used to form a glucose molecule (sugar).
While oxygen is produced as a result of photosynthesis, the primary function of the process for plants is producing energy in the form of sugars. Oxygen is only a byproduct that gets released into the atmosphere. Still, photosynthesis is not only the basic source of energy for all living creatures but also the primary source of oxygen in our atmosphere.
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