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General Science ➤ Biology ➤ 1
Question 16
Q16.  Iodine test is used to detect
 

Answer :  Carbohydrate


The Iodine test is used to test for the presence of starch (Carbohydrate). Iodine solution (iodine dissolved in an aqueous solution of potassium iodide) reacts with the starch, producing a purple-black colour. The test is used to detect the presence of starch in vegetables.
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Question 17
Q17.  Which one of the following is called the amphibian in plant kingdom ?
 

Answer :  Bryophyta


Bryophytes are amphibians of plant kingdom as they complete their life cycle in both water and on land.
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Question 18
Q18.  Find the odd one out.
 

Answer :  Ringworm


Ringworm is common disease, especially among children. It is caused by a fungus, not a worm like the name suggests.
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Question 19
Q19.  A tree's age can be found by
 

Answer :  counting the number of annual rings


As tree age, they grow in height and width. Observing a cross section of a tree (tree cookie) you will see growth rings. You can tell the age of a tree by counting these rings. The annual rings of a tree are made each year when a new layer of wood is added to the trunk and branches of the tree.
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Question 20
Q20.  The left aortic arch is observed in
 

Answer :  Mammals


The fourth right arch forms the right sub-clavian as far as the origin of its internal mammary branch; while the fourth left arch constitutes the arch of the aorta between the origin of the left carotid artery and the termination of the ductus arteriosus.
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