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Questions and Answers
What characteristic of diatoms is described in the content?
What type of starch is indicated as having a rounded appearance in the content?
Which of the following does NOT represent a form of starch mentioned in the content?
What feature distinguishes Chalk from Kieselguhr and Talc according to its description?
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In terms of structure, how are the frustules of diatoms described?
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Which starch has a gritty touch?
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What is the physical appearance of all listed starches?
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Which of the following starches has a polyhedral shape?
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Which starch is obtained from the stem tubers of Solanum tuberosum?
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What is the result of the iodine test for all the listed starches?
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Which of the following substances is used for dusting powders and is odorless and tasteless?
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What type of granules are all the starches classified as?
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Which family does Wheat Starch belong to?
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Which starch is noted for having a distinct hilum?
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What is the taste characteristic of Rice Starch?
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Study Notes
Starches
-
Potato Starch:
- White, odourless, starchy, smooth to the touch
- Bluish violet colour with iodine test
- Large, oval, rounded, triangular, or pyramidal shape
- Distinct, eccentric, pointed hilum
- Distinct, concentric striations
- Simple, compound, or semi-compound aggregations
- Polysaccharide granules obtained from the stem tubers of Solanum tuberosum
- Belongs to the Solanaceae family
-
Wheat Starch:
- White, odourless, starchy, smooth to the touch
- Bluish violet colour with iodine test
- Medium, rounded, oval, lenticular from a side view shape
- Faint, centric, pointed (linear in side view) hilum
- Faint, concentric rings
- Mostly simple, rarely compound aggregations
- Polysaccharide granules obtained from the endosperm of the grains of Triticum vulgare
- Belongs to the Gramineae family
-
Maize Starch:
- White, odourless, starchy, smooth to the touch
- Bluish violet colour with iodine test
- Medium, polyhedral with rounded angles shape
- Distinct, centric, cleft, or fissured hilum
- Absent striations
- Mostly simple, rarely compound aggregations
- Polysaccharide granules obtained from the endosperm of the grains of Zea mays
- Belongs to the Gramineae family
-
Rice Starch:
- White, odourless, starchy, gritty to the touch
- Bluish violet colour with iodine test
- Small, polyhedral with sharp angles shape
- Absent hilum except in large simple granules
- Absent striations
- Mostly simple, rarely compound aggregations
- Polysaccharide granules obtained from the endosperm of the grains of Oryza sativa
- Belongs to the Gramineae family
Non-Starches
-
Kieselguhr:
- White, odourless, tasteless, smooth to the touch
- No confirmatory chemical tests
-
Microscopical examination:
- Frustules, each consisting of 2 valves having sculptures. Fine transparent plates, with various shapes & sizes, with sharp jagged, and laminated edges. Aggregated or scattered.
- Frustules can be found in:
- Pinnate form
- Discoid form
- Honey-comb form. Kieselguhr (Diatoms)
-
Talc:
- White, odourless, tasteless, soapy to the touch
- No confirmatory chemical tests
-
Microscopical examination:
- Micro (light) and macro (heavy) crystals of different shapes and sizes are found
-
Chalk:
- White, odourless, chalky taste, smooth to the touch
- Dilute HCl test: Effervescence & evolution of CO2
- Microscopical examination: Not mentioned
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Description
This quiz covers the characteristics of various starches, including potato, wheat, and maize starch. You will learn about their physical properties, botanical origins, and classification in the plant kingdom. Test your knowledge on the composition and usage of these essential polysaccharides.
