Because cellulose is required for the stem growth as cellulose is the main constituent of the cell wall and also provides toughness to the stem.
When less sunlight is in those months the photosynthesis also lowers, resulting in the use of stored energy i.e starch. Hence the starch level decreases.
Explanation:
Cellulose is required for the growth and toughness of the stem. During spring the budding and growth is fastest in plants hence supply of cellulose increases.
The starch is the energy stored in plants. It is a polymer of glucose. When sunlight decreases in some months the rate of photosynthesis lowers down and plant starts using the stored form of energy ie. starch, required for various physiological activities and growth of the plants. This is the reason the starch level decreases in plants sometimes.
Do you mean how can you tell a person's blood type?
If so....
You can determine a person's blood type by a test called ABO typing which is a test that takes your blood sample which is than mixed with antibodies against type A and B blood. Then, the sample is checked to see whether or not the blood cells stick together. If it does stick than it means the blood reacted with one of the antibodies which is than your blood type. If both clump up and stick together than that means. a person can have Type O blood which contains both types of antibodies.
