Animal Nutrition Practice Questions
20 free Animal Nutrition practice questions for the General Science. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.
Which enzyme found in human saliva is responsible for the initial breakdown of starch into maltose?
- A Pepsin
- B Trypsin
- C Salivary amylase
- D Pancreatic lipase
Correct answer: Salivary amylase
Salivary amylase, also known as ptyalin, begins the chemical digestion of complex carbohydrates in the mouth. It acts on cooked starch to convert it into simpler sugars like maltose before the food reaches the stomach.
In ruminants like cows, which chamber of the stomach is considered the 'true stomach' where enzymatic digestion occurs?
- A Rumen
- B Reticulum
- C Omasum
- D Abomasum
Correct answer: Abomasum
The abomasum is the fourth compartment of the ruminant stomach and functions similarly to a monogastric stomach. It secretes gastric juices and hydrochloric acid to digest proteins and microbial biomass.
What is the primary function of bile juice secreted by the liver during digestion?
- A Digestion of proteins
- B Emulsification of fats
- C Absorption of water
- D Breakdown of cellulose
Correct answer: Emulsification of fats
Bile does not contain enzymes but is essential for fat digestion. It breaks down large fat globules into tiny droplets (emulsification), increasing the surface area for lipase enzymes to act upon.
Which of the following describes 'Holozoic' nutrition?
- A Organisms that feed on dead and decaying organic matter.
- B Organisms that derive nutrients from a living host without killing it.
- C Organisms that ingest solid or liquid organic food and digest it internally.
- D Organisms that synthesize their own food from simple inorganic raw materials.
Correct answer: Organisms that ingest solid or liquid organic food and digest it internally.
Holozoic nutrition involves the stages of ingestion, digestion, absorption, assimilation, and egestion. This mode of nutrition is characteristic of most animals, including humans, amoebas, and lions.
The finger-like projections called 'villi' in the small intestine are primarily adapted for:
- A Storing undigested food until it is egested
- B Increasing surface area for nutrient absorption
- C Secreting mucus to lubricate the intestinal wall
- D Churning chyme mechanically before absorption
Correct answer: Increasing surface area for nutrient absorption
Villi and microvilli significantly increase the internal surface area of the small intestine. This ensures that the maximum amount of digested nutrients can pass through the intestinal wall into the bloodstream.
Which part of the digestive system is responsible for the maximum absorption of water from undigested food?
- A Stomach
- B Small Intestine
- C Esophagus
- D Large Intestine
Correct answer: Large Intestine
The large intestine's primary role is to absorb water and mineral salts from the remaining indigestible food matter. This process solidifies the waste into feces before egestion.
Amoeba captures its food with the help of temporary finger-like extensions called:
- A Microvilli
- B Flagella
- C Contractile vacuoles
- D Pseudopodia
Correct answer: Pseudopodia
Amoeba uses pseudopodia, or 'false feet,' to surround and engulf food particles through a process called phagocytosis. The food is then trapped inside a food vacuole for digestion.
Which of the following vitamins is fat-soluble and essential for blood clotting?
- A Vitamin B12
- B Vitamin C
- C Vitamin A
- D Vitamin K
Correct answer: Vitamin K
Vitamin K is a fat-soluble vitamin that plays a vital role in the synthesis of proteins required for blood coagulation. Without it, the body cannot form clots, leading to excessive bleeding.
The process of taking food into the body is called:
- A Ingestion
- B Digestion
- C Egestion
- D Assimilation
Correct answer: Ingestion
Ingestion is the first step of animal nutrition. It involves the physical act of taking in organic material through the mouth or other specialized structures.
Which acidic substance is secreted in the stomach to kill bacteria and activate pepsinogen?
- A Hypochlorous acid
- B Acetic acid
- C Lactic acid
- D Hydrochloric acid
Correct answer: Hydrochloric acid
Hydrochloric acid (HCl) creates an acidic environment (pH 1.5–3.5) in the stomach. This low pH kills many ingested pathogens and converts inactive pepsinogen into the active protein-digesting enzyme, pepsin.
Saprophytic nutrition is commonly observed in which of the following?
- A Fungi
- B Leeches
- C Tapeworms
- D Lice
Correct answer: Fungi
Saprophytes, such as many fungi and certain bacteria, obtain nutrients by secreting digestive enzymes onto dead organic matter and then absorbing the liquefied products. This is also known as absorptive nutrition.
Which mineral is a key component of hemoglobin, the oxygen-carrying protein in red blood cells?
- A Iron
- B Zinc
- C Magnesium
- D Potassium
Correct answer: Iron
Iron is essential for the production of hemoglobin. A deficiency in dietary iron leads to anemia, characterized by reduced oxygen transport and fatigue.
The rhythmic contraction and relaxation of the muscles of the digestive tract to push food forward is called:
- A Peristalsis
- B Mastication
- C Emulsification
- D Assimilation
Correct answer: Peristalsis
Peristalsis is a series of wave-like muscle contractions that move food through the esophagus, stomach, and intestines. This involuntary process ensures that food travels in one direction through the alimentary canal.
What is the primary end product of protein digestion that is absorbed into the bloodstream?
- A Amino acids
- B Fatty acids
- C Glucose
- D Glycerol
Correct answer: Amino acids
Proteins are large polymers broken down by proteases (like pepsin and trypsin) into their constituent monomers, amino acids. These small molecules are then absorbed by the small intestine.
Which of the following animals is a 'Sanguivore'?
- A Mosquito
- B Butterfly
- C Vulture
- D Snail
Correct answer: Mosquito
Sanguivores are animals that feed on the blood of other living organisms. Female mosquitoes, leeches, and vampire bats are classic examples of this nutritional specialization.
In humans, the common passage for both bile and pancreatic juice into the duodenum is the:
- A Cystic duct
- B Common hepatic duct
- C Hepatopancreatic duct
- D Accessory pancreatic duct
Correct answer: Hepatopancreatic duct
The bile duct and the pancreatic duct join together to form the hepatopancreatic duct (or Ampulla of Vater). This common duct releases both digestive fluids into the first part of the small intestine.
Which nutritional disorder is caused by a severe deficiency of both proteins and calories in children?
- A Kwashiorkor
- B Marasmus
- C Scurvy
- D Rickets
Correct answer: Marasmus
Marasmus is a form of severe malnutrition characterized by energy deficiency, leading to extensive tissue and muscle wasting. It differs from Kwashiorkor, which is primarily a protein deficiency despite adequate calorie intake.
The digestive enzymes of the pancreas are secreted into the small intestine in an inactive form to prevent:
- A Wastage of energy during transport
- B Self-digestion of the pancreatic tissue
- C Premature mixing with bile in the duct
- D Neutralization of stomach acid in the duodenum
Correct answer: Self-digestion of the pancreatic tissue
Enzymes like trypsin are secreted as inactive proenzymes (trypsinogen) so they do not digest the pancreas itself. They are only activated once they reach the lumen of the small intestine.
Which part of the tooth is the hardest substance in the human body?
- A Dentin
- B Pulp
- C Cementum
- D Enamel
Correct answer: Enamel
Enamel is the highly mineralized outer coating of the tooth. It is composed primarily of hydroxyapatite and is designed to withstand the mechanical stresses of biting and chewing.
The process by which absorbed nutrients are utilized by the body's cells for energy, growth, and repair is called:
- A Absorption
- B Assimilation
- C Chemical digestion
- D Egestion
Correct answer: Assimilation
Assimilation is the final constructive stage of nutrition. After nutrients are absorbed into the blood and transported to cells, they are incorporated into the living tissues or used for metabolic energy.