The following 20 Multiple Choice Questions (MCQ) are based on
Chapter 9: Life Processes in Animals from the NCERT Class 7
Science textbook Curiosity. Each question has four options - select the
best answer and click to check.
Instructions: Read each question carefully. Choose the most
appropriate option from (a), (b), (c), or (d). Click
Show Answer to reveal the correct answer with explanation.
Multiple Choice Questions
1Digestion is the process of:
(a) Breaking complex food into simpler absorbable forms
(b) Taking in oxygen only
(c) Removing urine
(d) Moving blood only
(a) is correct
Large food components must be converted into smaller soluble substances.
2The alimentary canal begins at the mouth and ends at the:
(a) Stomach
(b) Small intestine
(c) Oesophagus
(d) Anus
(d) is correct
It is a continuous digestive tube through which food and waste pass.
3Mechanical digestion begins in the mouth through:
(a) Action of bile only
(b) Breathing
(c) Chewing by teeth
(d) Absorption by villi
(c) is correct
Teeth cut, tear and grind food into smaller pieces.
4Saliva helps digestion by:
(a) Producing bile
(b) Moistening food and beginning starch breakdown
(c) Digesting all fats completely
(d) Absorbing nutrients into blood
(b) is correct
Salivary enzymes start the chemical digestion of starch.
5The food pipe is also called the:
(a) Oesophagus
(b) Trachea
(c) Rectum
(d) Ureter
(a) is correct
The oesophagus carries swallowed food from mouth to stomach.
6Wave-like muscular movement pushing food along the canal is:
(a) Respiration
(b) Diffusion
(c) Photosynthesis
(d) Peristalsis
(d) is correct
Coordinated contractions move food through the digestive tract.
7The stomach helps digest food using:
(a) Only oxygen
(b) Villi only
(c) Muscular churning and digestive juices
(d) Only teeth
(c) is correct
Stomach movements mix food with acid and enzymes.
8Bile is produced by the:
(a) Large intestine
(b) Liver
(c) Pancreas
(d) Stomach
(b) is correct
The liver makes bile, which is stored in the gall bladder.
9Bile mainly helps in digestion of:
(a) Fats
(b) Minerals
(c) Water
(d) Vitamins only
(a) is correct
Bile breaks large fat droplets into smaller droplets for easier enzyme action.
10Most digestion and absorption occur in the:
(a) Mouth
(b) Large intestine
(c) Oesophagus
(d) Small intestine
(d) is correct
Digestive juices complete breakdown, and the intestinal surface absorbs nutrients.
11Finger-like projections that increase absorption area are:
(a) Nephrons
(b) Spiracles
(c) Villi
(d) Alveoli
(c) is correct
Villi provide a large surface and contain vessels that carry absorbed nutrients.
12The large intestine mainly absorbs:
(a) Bile
(b) Water and some salts
(c) All proteins
(d) Oxygen
(b) is correct
Remaining water is recovered before faeces are formed.
13Ruminants bring partly digested food back to the mouth as:
(a) Cud
(b) Bile
(c) Saliva only
(d) Faeces
(a) is correct
Cud is rechewed to help digest tough plant material.
14Amoeba captures food using:
(a) Teeth
(b) A tongue
(c) Villi
(d) Pseudopodia
(d) is correct
Temporary projections surround a food particle and form a food vacuole.
15Respiration releases:
(a) Light from leaves
(b) Minerals from bones
(c) Energy from food
(d) Only water from soil
(c) is correct
Cells break down food to obtain usable energy.
16In humans, gas exchange occurs mainly in the:
(a) Kidneys
(b) Alveoli of the lungs
(c) Stomach
(d) Oesophagus
(b) is correct
Thin-walled alveoli provide a large surface for oxygen and carbon dioxide exchange.
17During inhalation, the diaphragm generally:
(a) Contracts and moves downward
(b) Relaxes and moves upward
(c) Stops moving permanently
(d) Closes the trachea
(a) is correct
This increases chest volume and draws air into the lungs.
18Fish obtain dissolved oxygen using:
(a) Lungs only
(b) Spiracles
(c) Skin only
(d) Gills
(d) is correct
Water flowing across gills allows gas exchange.
19Insects breathe through openings called:
(a) Alveoli
(b) Gills
(c) Spiracles
(d) Villi
(c) is correct
Spiracles connect to a network of air tubes called tracheae.
20Earthworms exchange gases through their:
(a) Lungs
(b) Moist skin
(c) Dry scales
(d) Gills
(b) is correct
Oxygen and carbon dioxide diffuse across the moist body surface.
