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Micronutrients

Phloem sap co...

Question

Phloem sap contains

A

water and sucrose

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B

water and glucose

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C

water, sucrose and starch

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D

water, sucrose, other sugars, amino acids and hormones

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Solution

The correct option is D water, sucrose, other sugars, amino acids and hormones
Along with products of photosynthesis, hormones and other compounds are also transported.

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Q. Assertion :Sucrose is a reducing sugar and exhibits mutarotation. Reason: Sucrose is a disaccharide consisting of glucose and fructose units.

Which one of the following pairs of nutrients includes both as simple sugars (monosaccharides) ?

(a) Sucrose and glucose

(b) Glucose and maltose

(c) Fructose and glucose

(d) Maltose and lactose

Q. (+)-Sucrose has a specific rotation of +66.5, while D-(+)-glucose and D-(-)-fructose have specific rotations of +52.5 and -92.4 respectively. After complete hydrolysis of (+)-sucrose by dilute acid, what will be the specific rotation of the hydrolysis product, called invert sugar [a 1 : 1 mixture of D-(+)-glucose and D-(-)-fructose] ?

Q. Assertion :Sucrose is a non reducing sugar. Reason: Sucrose is a disaccharide formed by glycosidic linkage between

C - 1

α -

C - 2

β -

Q. (+)-Sucrose has a specific rotation of +66.5, while D-(+)-glucose and D-(-)-fructose have specific rotations of +52.5 and -92.4 respectively. After complete hydrolysis of (+)-sucrose by dilute acid, the specific rotation of the hydrolysis product, called invert sugar [a 1 : 1 mixture of D-(+)-glucose and D-(-)-fructose] is

- x

.
the nearest integer value of

x

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