6th Class General Science MCQs | Unit 4 Human Digestive System (انسانی نظامِ ہضم) | PakMCQs

Carbs, proteins, and fats is correct because these three large nutrient molecules form the main part of our food.

Too big is correct because large food molecules cannot pass through the tiny pores of the cell membrane.

Digestion is correct because it is the vital process that turns big food pieces into absorbable molecules.

When chewing food is correct because the breakdown of food starts in the mouth through physical chewing.

Digestive system organs is correct because food must pass through organs like the stomach and intestines to be fully digested.

Physical digestion is correct because big food pieces are first broken down mechanically before chemical action occurs.

Teeth is correct because they act physically to cut and grind food inside the mouth.

Tongue is correct because it mixes food with saliva and rolls it to make swallowing easier.

Stomach is correct because its strong muscles churn the food physically to help in digestion.

When it is broken down is correct because cells can only absorb nutrients when they are in very small, simple molecules.

Teeth is correct because their main function in the mouth is to slice and chop large pieces of food.

Tongue is correct because it actively moves food around the mouth and mixes it with saliva.

Stomach muscles is correct because they churn and mash food into a fine liquid paste similar to the action of a fork.

Chemical digestion is correct because enzymes use chemical reactions to break down nutrients into simpler forms.

Large food molecules is correct because enzymes target massive nutrient complexes to turn them into simple nutrients.

Carbohydrates is correct because bread is rich in complex starches that enzymes break into simple sugars.

They are absorbed and used by cells is correct because small soluble nutrients can easily enter the blood to nourish body cells.

Mouth is correct because digestion starts here when we chew our food.

Both Physical and Chemical is correct because both teeth chewing and saliva enzymes act in the mouth.

Tearing and crushing food is correct because teeth break down large bites into small pieces.

Rolling and mixing food is correct because the tongue moves food to mix it with saliva.

Saliva is correct because this watery mouth fluid has enzymes to break down food chemically.

Starch is correct because salivary enzymes specifically break down starches into simpler sugars.

Oesophagus is correct because it is the muscular tube that connects the mouth to the stomach.

Smooth muscles is correct because these involuntary muscles control the movement of food inside the digestive tract.

Contract is correct because the tightening and squeezing of these muscles forces the food downward.

Stomach is correct because it is the next digestive chamber where food is churned.

Partly digested is correct because food is only partially broken down in the mouth before stomach entry.

Both Physical and Chemical is correct because the stomach churns food physically and uses juices chemically.

Smooth muscles is correct because their automatic squeezing action physically grinds stomach contents.

Churning is correct because it is the mechanical grinding action of stomach walls that mixes food.

Gastric juice is correct because it contains the chemical ingredients needed to digest nutrients.

Stomach glands is correct because these specialized wall structures produce stomach acid and enzymes.

Enzymes and acid is correct because these substances break down food molecules and kill harmful bacteria.

Protein is correct because stomach acid activates enzymes that break down protein molecules like meat.

Soupy mixture is correct because the continuous physical and chemical digestion turns food into a thick liquid.

Small intestine is correct because it is the next organ where digestion and nutrient absorption occur.

Muscles is correct because muscular contractions of the stomach wall force the food forward.

Small intestine is correct because final food breakdown into absorbable molecules occurs inside this organ.

Pancreas and intestinal glands is correct because these organs release juices packed with enzymes for final digestion.

Nutrients is correct because fully broken down food yields useful components like sugars and proteins.

Into the blood is correct because tiny blood vessels in the intestinal walls take up the dissolved nutrients.

Villi is correct because these small structures absorb digested nutrients directly into the bloodstream.

Villi is correct because these microscopic folds increase the surface area for efficient food absorption.

Undigested material and liquids is correct because useful nutrients are already absorbed, leaving waste to pass forward.

Water is correct because recovering excess fluid from food waste helps to prevent body dehydration.

No digestion is correct because the large intestine is only responsible for processing waste and absorbing water.

Rectum is correct because it serves as a temporary storage chamber for digestive waste at the end of the large intestine.

Faeces is correct because it is the biological term for solid undigested food waste expelled from the bowels.

Anus is correct because it is the muscular opening at the very end of the digestive tract.

Liver is correct because it continuously synthesizes bile fluid to help break down dietary fats.

Fats is correct because bile emulsifies large lipid droplets into smaller particles for easier enzyme action.

Gall bladder is correct because it acts as a storage pouch for bile until food enters the small intestine.

Digestive enzymes is correct because pancreatic secretions are vital to breaking down all types of foods.

Small intestine is correct because the pancreatic duct delivers these enzymes to the small intestine for active digestion.

Villi of small intestine is correct because these microscopic folds contain blood vessels that pick up processed nutrients.

Circulatory system is correct because the blood in our blood vessels acts as the main transport network for food.

All cells of the body is correct because every single living cell requires nutrients to function and survive.

Finger-like projections is correct because this specific folded shape maximizes contact with digested food.

Small intestine is correct because it is the primary organ where nutrient absorption takes place.

Surface area is correct because having more surface area allows more nutrients to enter the blood capillaries at once.

20 is correct because young children develop this temporary set of teeth in early childhood.

6 and 12 years is correct because milk teeth loosen and fall out during these school-age years.

32 is correct because a complete set of fully grown adult teeth includes thirty-two teeth.

Permanent teeth is correct because once these adult teeth fall out, they cannot grow back naturally.

Iron nails is correct because stomach acid is highly concentrated hydrochloric acid capable of breaking down metals.

Mucus is correct because it forms a slippery protective lining on the inside wall of the stomach.

Large intestine is correct because it hosts trillions of helpful microbes that assist in body processes.

Vitamin K is correct because helpful gut bacteria produce this essential vitamin to support blood clotting.

30 % is correct because a significant portion of dried stool mass is made up of dead and living gut microbes.

Ingestion is correct because it is the initial step of consuming food into the mouth.

Physical digestion is correct because it involves mechanically breaking down food without altering its chemical makeup.

Chemical digestion is correct because enzymes chemically divide complex nutrient molecules into basic components.

Absorption is correct because it describes the physical uptake of soluble nutrients into the bloodstream.

Assimilation is correct because it refers to cells integrating and utilizing absorbed nutrients for energy and growth.

Egestion is correct because it is the final expulsion of waste matter through the end of the digestive tract.

Vomiting is correct because it describes the forceful reverse flow of food from the stomach out of the mouth.

All of the above is correct because food poisoning, digestive infections, and severe heartburn can all trigger vomiting.

Diarrhoea is correct because it is defined by frequent, loose, and watery bowel movements.

All of the above is correct because intestinal infections, side effects of medicines, and stress can cause loose motions.

Constipation is correct because slow movement of waste in the large intestine allows too much water to be absorbed, making waste dry.

All of the above is correct because low water intake, lack of physical activity, and low fiber in diet slow down bowel movements.

To enter cells through membrane is correct because cells can only absorb nutrients that are tiny enough to cross cell boundaries.

Mechanical and chemical is correct because food is processed both physically through crushing and chemically through reactions.

Mechanical digestion is correct because it uses physical forces like chewing and crushing to break food.

Chemical digestion is correct because chemical reactions are needed to alter and simplify complex nutrient bonds.

Enzymes is correct because they act as biological catalysts to speed up the chemical breakdown of foods.

Mouth to anus is correct because the digestive tract is a continuous tube starting from food intake to waste excretion.

All of the above is correct because the digestive tract manages food from eating and digesting to absorbing and excreting waste.

Blood is correct because the circulatory system uses blood to carry and distribute nutrients to all body tissues.

Both (A) and (B) is correct because vomiting, diarrhoea, and constipation are typical stomach and bowel problems.

Physical digestion is correct because the bread is broken down physically without changing its chemical identity.

Liver is correct because this organ synthesizes and secretes bile fluid to help break down lipids.

Mouth and stomach is correct because both structures physically crush food and chemically digest it using saliva or gastric juice.

Smooth muscles is correct because these involuntary muscles line the digestive tract walls to push food along.

Enzymes is correct because they act chemically to split big nutrient chains into simple, absorbable molecules.

Egestion is correct because it is the biological process of expelling solid digestive waste from the body.

Blood is correct because it runs through blood vessels to deliver absorbed nutrients to all body cells.

Gall bladder is correct because it serves as a temporary storage pouch for bile until it is needed for fat digestion.

Soupy mixture is correct because stomach churning and digestive juices turn food into a thick liquid.

Proteins is correct because gastric enzymes work together with acid to digest complex protein structures like meat.