Chapter 2- Nutrition in Animals Class 7 Worksheet – Multiple-Choice Questions (MCQs)

• What is the primary source of energy for the body?

A) Proteins

B) Carbohydrates

C) Fats

D) Vitamins

Answer- B) Carbohydrates

Answer- D) Digestion

• What is the role of vitamins and minerals in the body?

A) Providing energy

B) Growth and repair

C) Insulation

D) Biochemical reactions and health maintenance

Answer- D) Biochemical reactions and health maintenance

• Which organ produces gastric juices that contain hydrochloric acid and digestive enzymes?

A) Small intestine

B) Liver

C) Stomach

D) Oesophagus

Answer- C) Stomach

• What is the primary role of villi in the small intestine?

A) Mechanical digestion

B) Absorption of digested nutrients

C) Production of digestive enzymes

D) Formation of chyme

Answer- B) Absorption of digested nutrients

Answer- B) Small intestine

• Which type of teeth is responsible for tearing food, such as when biting into a piece of meat?

A) Incisors

B) Canines

C) Premolars

D) Molars

Answer- B) Canines

• What is the primary role of premolars in the mouth?

A) Cutting and biting

B) Tearing food

C) Grinding and crushing food

D) Breaking down tough or fibrous foods

Answer- C) Grinding and crushing food

• What enzyme found in saliva initiates the chemical digestion of carbohydrates by converting starches into simpler sugars?

A) Protease

B) Lipase

C) Amylase

D) Nuclease

Answer- C) Amylase

• What is the function of amylase in saliva?

A) Breaking down fats

B) Initiating the breakdown of carbohydrates

C) Aiding in protein digestion

D) Promoting the absorption of nutrients

• Which tastes are detected by taste buds on the tongue?

A) Sweet, salty, spicy, umami

B) Sweet, salty, sour, bitter

C) Spicy, sour, umami, savoury

D) Sweet, sour, savoury, bitter

Answer- B) Sweet, salty, sour, bitter

• At what age do milk teeth typically start falling out in children?

A) Around three years

B) Around six months

C) Between six to eight years

D) Between twelve to fourteen years

Answer- C) Between six to eight years

• What is the main cause of tooth decay?

A) Chewing hard objects

B) Drinking too much water

C) Interaction of harmful bacteria with sugars

D) Lack of vitamin C

Answer- C) Interaction of harmful bacteria with sugars

• What is the role of the epiglottis during swallowing?

A) It aids in chewing food

B) It produces saliva

C) It closes off the windpipe to prevent choking

D) It helps digest carbohydrates

Answer- C) It closes off the windpipe to prevent choking

• What are the consequences of untreated tooth decay?

A) Shiny teeth

B) Tooth sensitivity

C) Enhanced chewing ability

D) Improved speech

Answer- B) Tooth sensitivity

• What is the purpose of peristalsis in the oesophagus?

A) Absorption of nutrients

B) Mixing food with gastric juices

C) Propelling food to the stomach

D) Storing food temporarily

Answer- C) Propelling food to the stomach

• What triggers the vomiting reflex in the body?

A) Digestion of food

B) Consumption of water

C) Overeating or harmful substances

D) Resting after a meal

Answer- C) Overeating or harmful substances

• Where does the stomach connect to in the digestive tract?

A) Small intestine

B) Large intestine

C) Oesophagus

D) Mouth

Answer- A) Small intestine

• What is the primary function of the mucus secreted by the stomach’s inner lining?

A) Activation of digestive enzymes

B) Killing harmful bacteria

C) Breaking down proteins

D) Shielding the stomach lining

Answer- D) Shielding the stomach lining

• Why is an acidic environment in the stomach essential for digestion?

A) It enhances the taste of food

B) It prevents overeating

C) It activates digestive enzymes and kills harmful bacteria

D) It soothes stomach discomfort

Answer- C) It activates digestive enzymes and kills harmful bacteria

• Which enzyme in the stomach is responsible for breaking down proteins into smaller peptide fragments?

A) Lipase

B) Amylase

C) Pepsin

D) Lactase

Answer- C) Pepsin

• What is the primary function of villi in the small intestine?

A) Production of digestive enzymes

B) Absorption of digested food components

C) Mixing of food with digestive juices

D) Storage of nutrients

Answer- B) Absorption of digested food components

• Where is bile produced, and what is its role in fat digestion?

A) Produced in the pancreas, breaks down proteins

B) Produced in the small intestine, emulsifies fats

C) Produced in the gallbladder, digests carbohydrates

D) Produced in the liver, emulsifies fats

Answer- D) Produced in the liver, emulsifies fats

• Which organ secretes pancreatic juice, and what does it contain?

A) Stomach, contains bile

B) Pancreas, contains digestive enzymes

C) Small intestine, contains hydrochloric acid

D) Liver, contains insulin

Answer- B) Pancreas, contains digestive enzymes

• What is the primary function of the villi in the small intestine?

A) Production of digestive enzymes

B) Absorption of digested food materials

C) Mixing of food with digestive juices

D) Storage of nutrients

Answer- B) Absorption of digested food materials

• Which substances are absorbed through the capillaries in the villi of the small intestine?

A) Starch and cellulose

B) Oxygen and carbon dioxide

C) Glucose, amino acids, and fatty acids

• D) Vitamins and minerals

Answer- C) Glucose, amino acids, and fatty acids

• What is the term for the process by which faeces are eliminated from the body through the anus?

A) Absorption

B) Egestion

C) Assimilation

D) Digestion

Answer- B) Egestion

• What is the primary function of the rumen in the digestive system of ruminant animals like cows and buffaloes?

A) Storage of undigested food

B) Mechanical breakdown of food

C) Fermentation and partial digestion of food

D) Absorption of nutrients

Answer- C) Fermentation and partial digestion of food

• Which type of carbohydrate is abundant in grass and poses a challenge for digestion in many animals, including humans?

A) Glucose

B) Cellulose

C) Starch

D) Sucrose

Answer- B) Cellulose

• What adaptation allows animals like horses and rabbits to digest cellulose-rich plant material?

A) Rumen

B) Caecum

C) Rumination

D) Small intestine

Answer- B) Caecum

• How does Amoeba capture and digest food?

A) Using tentacles

B) By secreting enzymes into the environment

C) Extending pseudopodia around the food and forming a food vacuole

D) Absorbing food directly through its cell membrane

Answer- C) Extending pseudopodia around the food and forming a food vacuole

• What is the primary feeding strategy employed by starfish to access animals with hard shells?

A) Biting and tearing the shell

B) Using its sharp beak to crack the shell

C) Extruding its stomach into the prey’s shell

D) Smashing the shell with its tube feet

Answer- C) Extruding its stomach into the prey’s shell

• What is the purpose of digestive enzymes released by starfish during the feeding process?

A) To harden the prey’s shell

B) To immobilise the prey

C) To break down the prey’s body into simpler substances

D) To protect the starfish from the prey

Answer- C) To break down the prey’s body into simpler substances