Question

1. Which of the following statements about the autotrophs is incorrect?
(a) They synthesis carbohydrates from carbon dioxide and water in the presence of sunlight and chlorophyll
(b) They store carbohydrates in the form of starch
(c) They convert carbon dioxide and water into carbohydrates in the absence of sunlight
(d) They constitute the first trophic level in food chains
2. In which of the following groups of organisms, food material is broken down
outside the body and absorbed?
(a) Mushroom, green plants, Amoeba
(b) Yeast, mushroom, bread mould
(c) Paramecium, Amoeba, Cuscuta
(d) Cuscuta, lice, tapeworm

3. Which is the correct sequence of parts in the human alimentary canal?
(a) Mouth →stomach →small intestine →oesophagus→large intestine
(b) Mouth →oesophagus→stomach →large intestine →small intestine
(c) Mouth →stomach →oesophagus→small intestine →large intestine
(d) Mouth →oesophagus→stomach →small intestine →large intestine


4. If salivary amylase is lacking in the saliva, which of the following events in the
mouth cavity be affected?
(a) Proteins breaking down into amino acids
(b) Starch breaking down into sugars
(c) Fats breaking down into fatty acids and glycerol
(d) Absorption of vitamins

Answer 1

Answer:

1.  Option C

2. Option B

3. Option D

4- Option B

Explanation:

1.  Option C -They convert carbon dioxide and water into carbohydrates in the absence of sunlight.

2. Option B - Fungi (yeast, mushroom, bread mould) are saprophytes. They obtain their food by breaking it outside the body and then absorbing it.

3. Option D - Mouth -Oesophagus -Stomach-Small-intestine-Large intestine

4- Option B - Starch breaking down into sugars.

Among them is salivary amylase that helps in the breakdown of starch into simple sugars, lingual lipase that acts on fats breaking them into fatty acids and glycerol and kallikrein that produces bradykinin which is a potent vasodilator. Hence the correct answer is option.