- Where do the electrons come from in photosynthesis?
- What is the order of flow of the electron in the light reactions?
- What energy pathway is needed for photosynthesis?
- What Colour indicates the presence of starch?
- How can we detect the presence of starch?
- Can Starch be produced in the dark?
- Why is starch present in leaves?
- How do you know if a leaf has starch?
- How is starch prepared by trees?
- What is the relationship between glucose and starch in photosynthesis?
- What is the process by which glucose is converted to starch?
- What is the difference between the structure of starch and glycogen?
The electrons must travel through special proteins stuck in the thylakoid membrane. They go through the first special protein (the photosystem II protein) and down the electron transport chain. Then they pass through a second special protein (photosystem I protein).
Where do the electrons come from in photosynthesis?
In (a) photosystem II, the electron comes from the splitting of water, which releases oxygen as a waste product. In (b) photosystem I, the electron comes from the chloroplast electron transport chain. The two photosystems absorb light energy through proteins containing pigments, such as chlorophyll.
What is the order of flow of the electron in the light reactions?
Electrons start at a low energy level in water, move slightly downhill to reach P680, are excited to a very high energy level by light, flow downhill through several additional molecules, reach P700, are excited to an even higher energy level by light, then flow through a couple more molecules before arriving at NADPH …
What energy pathway is needed for photosynthesis?
During the process of photosynthesis, cells use carbon dioxide and energy from the Sun to make sugar molecules and oxygen. These sugar molecules are the basis for more complex molecules made by the photosynthetic cell, such as glucose.
What Colour indicates the presence of starch?
Starch Test: Add Iodine-KI reagent to a solution or directly on a potato or other materials such as bread, crackers, or flour. A blue-black color results if starch is present. If starch amylose is not present, then the color will stay orange or yellow.
How can we detect the presence of starch?
We can use iodine solution to test for the presence of starch. If starch is present is a food item, it turns blue-black colour when iodine solution is added to it.
Can Starch be produced in the dark?
Leaves of a plant kept in the dark do not produce starch because the production of starch requires the process of photosynthesis to occur. Photosynthesis only occurs in plants in the presence of Sunlight which is absent in dark.
Why is starch present in leaves?
Excess energy, created from photosynthesis, is stored in plant tissue as starch. It houses glucose, which plants use for food. The presence of starch in a leaf is reliable evidence of photosynthesis. That’s because starch formation requires photosynthesis.
How do you know if a leaf has starch?
The presence of starch in leaves can be tested by the Iodine test. When we remove chlorophyll from the leaf by boiling it in alcohol and then put two drops of iodine solution, it is colour change to blue indicates the presence of starch.
How is starch prepared by trees?
by the process of photosynthesis the plants prepare starch for them plants use light energy to produce glucose from carbon dioxide. The glucose is used to make cellulose fibers, the structural component of the plant, or is stored in the form of starch granules, in amyloplasts.
What is the relationship between glucose and starch in photosynthesis?
Little free glucose is produced in plants; instead, glucose units are linked to form starch or are joined with fructose, another sugar, to form sucrose (see carbohydrate).
What is the process by which glucose is converted to starch?
What is the difference between the structure of starch and glycogen?
Glycogen is made up of the single-molecule whereas starch is made up of two molecules namely amylose and amylopectin. Glycogen forms the branched-chain structure whereas Starch forms linear, coiled, and branch structure.