Photosynthesis test questions
- What is the role of chlorophyll?
- Which useful energy conversion is carried out by chlorophyll?
- What are the products of the light reactions?
- In photosynthesis, what is ATP required for?
- In which cell organelles does carbon fixation occur?
What is photosynthesis questions and answers?
Answer: Photosynthesis is the process in which green plants use sunlight to make their own food. Photosynthesis requires sunlight, chlorophyll, water, and carbon dioxide gas as raw materials.
What are the 5 things photosynthesis?
Materials Needed for Photosynthesis
- Chlorophyll. Chlorophyll, the pigment in plants that makes them green, is essential to the photosynthetic process.
- Sunlight. The process cannot work without an energy input, and this comes from the sun.
- Carbon Dioxide.
What are the 4 types of photosynthesis?
The three main types of photosynthesis are C3, C4, and CAM (crassulacean acid metabolism). In college I had to memorize some of their pathways and mechanisms, but I will highlight what gives one an advantage over another and what types of crops, forages, and weeds have specialized C3 and C4 photosynthesis.
What Colour is chlorophyll?
Chlorophyll is a pigment that gives plants their green color, and it helps plants create their own food through photosynthesis.
Why do plants appear green?
The colours of visible light form a colour wheel. Within that wheel the colour an object appears to be is the colour complementary to the one it most strongly absorbs. As such, plants look green because they absorb red light most efficiently and the green light is reflected.
Why photosynthesis is called dark reaction?
Instead, dark reaction uses ATP and NADPH to produce energy molecules. No photosystem is required. Photolysis of water does not occur. So, the dark reaction in photosynthesis is called so because it does not require light energy.
What do plants breathe?
Plants do require oxygen for respiration which in return gives out carbon dioxide. Unlike animals, plants do not have any specialized structures for gaseous exchange but they have stomata (present in leaves) and lenticels (present in stems) which are involved in the exchange of gases.
Which light is most important for photosynthesis?
The majority of green light is useful in photosynthesis. The relative quantum efficiency curve (Photo 1) shows how efficiently plants use wavelengths between 300 and 800 nm. Green light is the least efficiently used color of light in the visible spectrum.
What are 3 important facts about photosynthesis?
10 Facts on Photosynthesis
- The green color of leaves is due to chlorophyll.
- The two main parts of a chloroplast are the grana and stroma.
- The first stage of photosynthesis captures energy from the sun to break down water molecules.
- The second stage of photosynthesis is the Calvin cycle.
What are the 2 products of photosynthesis?
Photosynthesis is a series of chemical reactions that convert carbon dioxide and water into glucose (sugar) and oxygen in the presence of sunlight.
What are the 7 steps of photosynthesis?
Terms in this set (7)
- Step 1-Light Dependent. CO2 and H2O enter the leaf.
- Step 2- Light Dependent. Light hits the pigment in the membrane of a thylakoid, splitting the H2O into O2.
- Step 3- Light Dependent. The electrons move down to enzymes.
- Step 4-Light Dependent.
- Step 5-Light independent.
- Step 6-Light independent.
- calvin cycle.
What are C3 crops?
C3 plants include some of the most important sources of calories all over the world: cowpea, cassava, soybean, and rice. The regions where these crops are grown in are often hot and dry, meaning they could benefit from the energy-saving mechanisms of C4 photosynthesis.
Do all plants photosynthesize?
This process is called photosynthesis and is performed by all plants, algae, and even some microorganisms. To perform photosynthesis, plants need three things: carbon dioxide, water, and sunlight. for photosynthesis. Carbon dioxide enters through tiny holes in a plant’s leaves, flowers, branches, stems, and roots.
Which plant is C4?
C4 plants include many tropical grasses and are among the world’s most important crop species (maize and sugarcane).
What is not used in photosynthesis?
So, the correct answer is ‘Iodine solution‘.
What sugar is formed in photosynthesis?
Photosynthesis happens in small compartments within the plant cells, called chloroplasts. In a two-step process, plants obtain chemical energy from sunlight. The collected energy is used in a second reaction to produce the sugar glucose.
What are the 4 types of chlorophyll?
There are four types of chlorophyll: chlorophyll a, found in all higher plants, algae and cyanobacteria
chlorophyll b, found in higher plants and green algae
chlorophyll c, found in diatoms, dinoflagellates and brown algae
and chlorophyll d, found only in red algae.
Why is photosynthesis important?
Photosynthesis is arguably the most important biological process on earth. By liberating oxygen and consuming carbon dioxide, it has transformed the world into the hospitable environment we know today.
Where does photosynthesis take place?
In plants, photosynthesis takes place in chloroplasts, which contain the chlorophyll. Chloroplasts are surrounded by a double membrane and contain a third inner membrane, called the thylakoid membrane, that forms long folds within the organelle.
Why are plants not black?
The simple answer is that although plants absorb almost all the photons in the red and blue regions of the light spectrum, they absorb only about 90% of the green photons. If they absorbed more, they would look black to our eyes. Plants are green because the small amount of light they reflect is that color.
Which is the first step in photosynthesis?
The first step in photosynthesis is the light reaction or photochemical reactions resulting in the formation of ATP and NADPH, which are later utilised in the biosynthesis process. In the first stage, light energy is captured and converted to chemical energy.
Who made Calvin cycle?
The Calvin cycle is a part of photosynthesis, the process plants and other autotrophs use to create nutrients from sunlight and carbon dioxide. The process was first identified by American biochemist Dr. Melvin Calvin in 1957.
How NADPH is formed?
NADPH is formed on the stromal side of the thylakoid membrane, so it is released into the stroma. In a process called non-cyclic photophosphorylation (the “standard” form of the light-dependent reactions), electrons are removed from water and passed through PSII and PSI before ending up in NADPH.
Why are chloroplasts green?
What makes a leaf green is chlorophyll, the green pigment located within the chloroplasts. More specifically, chlorophyll resides in the thylakoid membranes. The chlorophyll absorbs energy from sunlight, and it is this energy that drives the synthesis of food molecules in the chloroplast.
How does sunlight affect photosynthesis?
During photosynthesis, plants trap light energy with their leaves. Plants use the energy of the sun to change water and carbon dioxide into a sugar called glucose. Glucose is used by plants for energy and to make other substances like cellulose and starch.
Do plants feel pain?
Given that plants do not have pain receptors, nerves, or a brain, they do not feel pain as we members of the animal kingdom understand it. Uprooting a carrot or trimming a hedge is not a form of botanical torture, and you can bite into that apple without worry.
What colors are used in photosynthesis?
To perform photosynthesis, violet light is the most important color, and it’s from these wavelengths that plants get most of their energy. The reason for this is because out of the visible spectrum, red light is the longest wavelength light that the photosynthesis process can use, but it has the least energy.
What colors of light do plants not absorb?
Chlorophylls do not absorb wavelengths of green and yellow, which is indicated by a very low degree of light absorption from about 500 to 600 nm. The absorption spectrum of β-carotene (a carotenoid pigment) includes violet and blue-green light, as is indicated by its peaks at around 450 and 475 nm.
Which pigments are used in photosynthesis?
Chlorophylla-a is the primary pigment for photosynthesis in plants, but the range of light absorption is extended by chlorophyll-b, beta-carotene and other accessory pigments.