Tag: constitutes of diet

Quizzes (21) Questions (58)

Questions Related to constitutes of diet

Multiple choice biology constitutes of diet nutrients and foodstuffs simple test for nutrients test for nutrients

A green leaf is partially covered and placed in the light for several days. If it is then boiled and tested for starch with iodine, what will be the result? 

  1. Starch will be found only in the part of the leaf exposed to light

  2. Starch will be found in the entire leaf

  3. Starch will be found only in the shaded part of the leaf

  4. Starch will not be found in the leaf at all
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A green leaf is partially covered and placed in the light for several days. If it is then boiled and tested for starch with iodine starch will be found only in the part of the leaf exposed to light. This is because starch is the end product of photosynthesis. The process of photosynthesis will take place only in the location of leaves where light is present. 

In the given question, the leaf is partially covered which means, no photosynthesis takes place in these areas. Thus, when iodine is introduced to these parts after boiling, it cannot give blue-black color. Whereas the other parts which were exposed to sunlight will give blue-black color.
So, the correct answer is option A.

Multiple choice biology constitutes of diet nutrients and foodstuffs simple test for nutrients test for nutrients

The presence of starch in leaves can be tested with

  1. Iodine solution.

  2. Copper sulphate solution.

  3. Lime water.

  4. Benedict's solution.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Starch is an important food reserve present in the leaf of the plant. The Iodine test is used to test for the presence of starch. Iodine solution where the iodine dissolved in an aqueous solution of potassium iodide reacts with the starch, producing a purple-black color.

So, the correct answer is option A.

Multiple choice biology constitutes of diet role of vitamins functions and principal sources of vitamins and minerals need for nutrients

A person suffering from malaria gets fever when

  1. Exoerythrocytic cycle is completed

  2. Signet ring stage is formed

  3. RBC generally ruptured and haemozoin granules are released

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Rupture of RBC result in septicemia because of release of hematite granules in the blood resulting in characteristic chills and high fever.