Question

In which of the following groups of organisms, food material is broken down outside the body and absorbed?


Mushroom, green plants, Amoeba

Yeast, mushroom, bread mould

Paramecium, Amoeba, Cuscuta

Cuscuta, lice, tapeworm


Answer: (b) Yeast, Mushroom, bread mould [These are saprotrophs, and digestion in saprotrophs takes place before ingestion.]

Select the correct statement


Heterotrophs do not synthesise their own food

Heterotrophs utilise solar energy for photosynthesis

Heterotrophs synthesise their own food

Heterotrophs are capable of converting carbon dioxide and water into carbohydrates


Answer: (a) Heterotrophs do not synthesize their own food [Other options show features of autotrophic nutrition.]



Which of the following statements about the autotrophs is incorrect?


They synthesise carbohydrates from carbon dioxide and water in the presence of sunlight and chlorophyll

They store carbohydrates in the form of starch

They convert carbon dioxide and water into carbohydrates in the absence of sunlight

They constitute the first trophic level in food chains


Answer: (c) They convert carbon dioxide and water into carbohydrates in the absence of sunlight

Which is the correct sequence of parts in human alimentary canal?


Mouth → stomach → small intestine → oesophagus → large intestine

Mouth →oesophagus → stomach → large intestine → small intestine

Mouth → stomach → oesophagus → small intestine → large intestine

Mouth → oesophagus → stomach → small intestine → large intestine


Answer: (d) Mouth → oesophagus → stomach → small intestine → large intestine

If salivary amylase is lacking in the saliva, which of the following events in the mouth cavity will be affected?


Proteins breaking down into amino acids

Starch breaking down into sugars

Fats breaking down into fatty acids and glycerol

Absorption of vitamins


Answer: (b) Starch breaking down into sugars [Salivary amylase digests starch. Hence, its absence will hamper digestion of starch.]



The inner lining of stomach is protected by one of the following from hydrochloric acid. Choose the correct one


Pepsin

Mucus

Salivary amylase

Bile


Answer: (b) Mucus

Which part of alimentary canal receives bile from the liver?


Stomach

Small intestine

Large intestine

Oesophagus


Answer: (b) Small intestine [Bile comes to the small intestine through hepato-pancreatic duct.]

A few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains


Complex proteins

Simple proteins

Fats

Starch


Answer: (d) Starch [Starch makes a dark blue complex with iodine.]



In which part of the alimentary canal food is finally digested?


Stomach

Mouth cavity

Small intestine

Large intestine


Answer: (c) Small intestine [Major part of digestion takes place in small intestine; where digestion is completed.]

Choose the function of the pancreatic juice from the following


Trypsin digests proteins and lipase carbohydrates

Trypsin digests emulsified fats and lipase proteins

Trypsin and lipase digest fats

Trypsin digests proteins and lipase emulsified fats


Answer: (d) Trypsin digests proteins and lipase emulsified fats

When air is blown from mouth into a test-tube containing lime water, the lime water turned milky due to the presence of


Oxygen

Carbon dioxide

Nitrogen

Water vapour


Answer: (b) Carbon dioxide [Carbon dioxide reacts with limewater to form calcium carbonate. Insoluble calcium carbonate is responsible for appearance of white colour.]
ans also i gave

Answer 1

Answer:

you already have given the answers ...