Which of the following is another name for starch found mainly in the pulp of seeds, fruits, tubers, roots and stems of plants, especially in corn, potatoes, wheat and rice?
Amylum
Understanding Starch and its Names
The question asks for another name for starch, a common carbohydrate found in many plants, specifically mentioning sources like corn, potatoes, wheat, and rice. Starch is a polysaccharide, meaning it is a large molecule made up of many smaller sugar units (glucose molecules) linked together.
What is Starch?
Starch serves as the primary energy storage molecule in plants. It is stored in various parts of the plant, including:
- Seeds (like corn, wheat, rice)
- Fruits (like bananas, though less common as the main storage)
- Tubers (like potatoes)
- Roots (like cassava, sweet potatoes)
- Stems (like sago palm)
When plants need energy, they break down starch back into glucose.
Analyzing the Options for Starch Names
Let's look at the given options to identify the correct alternative name for starch.
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Amylum: Amylum is a traditional or scientific term for starch. It comes from the Greek word 'amylon', meaning 'not ground' or 'fine meal'. This term is often used in botany, pharmacy, or historical contexts to refer to starch.
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Xanthan: Xanthan gum is a different type of polysaccharide produced by a bacterium (Xanthomonas campestris). It is primarily used as a thickening agent and stabilizer in food and industrial products. It is not a name for the starch found in corn, potatoes, or wheat.
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Olestra: Olestra is a synthetic fat substitute. It is not a carbohydrate and is chemically very different from starch. It is made by combining sucrose with fatty acids.
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Saponin: Saponins are bitter, soap-like compounds found in various plants. They belong to a different class of compounds, typically glycosides, and are not related to starch in terms of chemical structure or function.
Identifying the Correct Term for Starch
Based on the analysis of the options, Amylum is the term that serves as another name for starch, particularly in scientific or historical contexts, aligning with its description as a substance found in the pulp of seeds, fruits, tubers, roots, and stems of plants like corn, potatoes, wheat, and rice.
| Term | Description | Is it another name for starch? |
|---|---|---|
| Amylum | Traditional/Scientific name for starch. | Yes |
| Xanthan | Polysaccharide produced by bacteria; used as thickener. | No |
| Olestra | Synthetic fat substitute. | No |
| Saponin | Soap-like plant compound (glycoside). | No |
Revision Table: Key Carbohydrates
| Carbohydrate Type | Description | Examples | Key Role |
|---|---|---|---|
| Monosaccharides | Simple sugars | Glucose, Fructose, Galactose | Immediate energy source |
| Disaccharides | Two monosaccharides linked | Sucrose (Glucose + Fructose), Lactose (Glucose + Galactose), Maltose (Glucose + Glucose) | Transport sugars, energy |
| Polysaccharides | Many monosaccharides linked | Starch, Glycogen, Cellulose, Chitin | Energy storage (Starch, Glycogen), structural support (Cellulose, Chitin) |
Additional Information on Plant Starch
Plant starch is a complex carbohydrate composed primarily of two polymers of glucose: amylose and amylopectin.
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Amylose: A linear chain of glucose units linked by $\alpha(1\rightarrow4)$ glycosidic bonds.
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Amylopectin: A branched structure with glucose units linked by $\alpha(1\rightarrow4)$ bonds in the chains and $\alpha(1\rightarrow6)$ bonds at the branch points.
The ratio of amylose to amylopectin varies depending on the plant source, which affects the physical properties of the starch.
Starch is a crucial part of the human diet, providing significant energy. It is broken down by enzymes called amylases in the digestive system.
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Important Questions from Botany
Which of the following is a type of nutrition?
I. Heterotrophic
II. Autotrophic
Part of N 2cycle that is opposed to N 2fixation is:
Which among the following is the reproductive part of a plant?
Fibres (Adventitious) roots are found in :
In which Part of the flower does Meiosis take place ?
