Online Test — Nutrition in Plants and Animals
30 Questions • 15 min • Chapter MCQ
15:00
Question 1 of 30
Organisms that make their own food are called:
Heterotrophs
Autotrophs
Parasites
Saprophytes
Explanation: Autotrophs make their own food from simple raw materials.
Question 2 of 30
Green plants make their food mainly by:
Chemosynthesis
Photosynthesis
Holozoic feeding
Parasitism
Explanation: Green plants make food by photosynthesis using sunlight and chlorophyll.
Question 3 of 30
Feeding on dead and decaying matter is called ______ nutrition.
Holozoic
Saprophytic
Parasitic
Autotrophic
Explanation: Saprophytic organisms (e.g. fungi) feed on dead, decaying matter.
Question 4 of 30
A tapeworm living inside a host shows ______ nutrition.
Holozoic
Saprophytic
Parasitic
Autotrophic
Explanation: A parasite lives on/in a host and takes its food (parasitic nutrition).
Question 5 of 30
The mode of nutrition in which an animal takes in and digests food is:
Holozoic
Saprophytic
Parasitic
Chemosynthetic
Explanation: Holozoic nutrition involves taking in, digesting, and absorbing food.
Question 6 of 30
Photosynthesis takes place mainly inside which structures of the leaf cells?
Mitochondria
Chloroplasts
Vacuoles
Nuclei
Explanation: Photosynthesis occurs in chloroplasts, which contain chlorophyll.
Question 7 of 30
The gas released as a by-product of photosynthesis is:
Carbon dioxide
Oxygen
Nitrogen
Hydrogen
Explanation: Splitting of water in the light reactions releases oxygen.
Question 8 of 30
Which stage of photosynthesis traps light energy and splits water?
Light reactions
Dark reactions
Calvin cycle
Respiration
Explanation: The light reactions capture light energy and split water, releasing oxygen.
Question 9 of 30
The dark reactions (Calvin cycle) mainly use carbon dioxide to build:
Oxygen
Glucose
Water
Chlorophyll
Explanation: The dark reactions use CO2 and stored energy to make glucose.
Question 10 of 30
Which of these is a factor affecting the rate of photosynthesis?
Light intensity
Carbon dioxide level
Temperature
All of these
Explanation: Light, carbon dioxide, and temperature (plus water and chlorophyll) all affect the rate.
Question 11 of 30
Plants absorb minerals from the soil mainly through their:
Leaves
Roots
Flowers
Stem only
Explanation: Roots absorb minerals dissolved in water from the soil.
Question 12 of 30
Minerals needed by plants in large amounts are called:
Micronutrients
Macronutrients
Vitamins
Pigments
Explanation: Macronutrients (N, P, K, Ca, S) are required in large amounts.
Question 13 of 30
Which mineral is needed for making proteins and chlorophyll?
Nitrogen
Iron
Boron
Zinc
Explanation: Nitrogen is essential for proteins and chlorophyll.
Question 14 of 30
Yellowing of leaves and stunted growth usually indicate a deficiency of:
Potassium
Nitrogen
Calcium
Sulphur
Explanation: Nitrogen deficiency causes leaf yellowing and stunted growth.
Question 15 of 30
Iron, zinc, and copper, needed only in tiny amounts, are examples of:
Macronutrients
Micronutrients
Carbohydrates
Proteins
Explanation: These are micronutrients, essential in trace amounts.
Question 16 of 30
The breaking down of complex food into simple, soluble substances is called:
Absorption
Digestion
Egestion
Respiration
Explanation: Digestion breaks large food molecules into small, soluble ones.
Question 17 of 30
The muscular tube that carries food from the mouth to the stomach is the:
Oesophagus
Trachea
Small intestine
Liver
Explanation: The oesophagus (food pipe) pushes food to the stomach.
Question 18 of 30
Most digestion and absorption of food take place in the:
Stomach
Small intestine
Large intestine
Mouth
Explanation: The small intestine completes digestion and absorbs nutrients.
Question 19 of 30
Which organ produces bile that helps in the digestion of fats?
Pancreas
Liver
Stomach
Kidney
Explanation: The liver makes bile, which helps digest fats.
Question 20 of 30
The main function of the large intestine is to:
Digest proteins
Absorb water from undigested food
Make bile
Chew food
Explanation: The large intestine absorbs water, making the waste more solid.
Question 21 of 30
A substance that speeds up a chemical reaction in the body without being used up is a(n):
Enzyme
Mineral
Vitamin
Hormone
Explanation: Enzymes are biological catalysts that speed up reactions without being used up.
Question 22 of 30
Salivary amylase, found in saliva, begins the digestion of:
Proteins
Fats
Starch
Water
Explanation: Salivary amylase acts on starch, breaking it into simpler sugars.
Question 23 of 30
The enzyme pepsin works in the stomach and digests:
Starch
Proteins
Fats
Sugars
Explanation: Pepsin begins protein digestion in the acidic stomach.
Question 24 of 30
Fats are digested into fatty acids and glycerol by the enzyme:
Amylase
Pepsin
Lipase
Trypsin
Explanation: Lipase (helped by bile) breaks fats into fatty acids and glycerol.
Question 25 of 30
The final product of protein digestion is:
Glucose
Amino acids
Fatty acids
Starch
Explanation: Proteins are broken down into amino acids.
Question 26 of 30
The passage of digested nutrients through the intestine wall into the blood is called:
Digestion
Absorption
Egestion
Chewing
Explanation: Absorption moves digested nutrients into the blood and lymph.
Question 27 of 30
The tiny finger-like projections on the inner wall of the small intestine are called:
Cilia
Villi
Nephrons
Alveoli
Explanation: Villi are finger-like projections that increase surface area for absorption.
Question 28 of 30
Villi help absorption mainly because they:
Make enzymes
Increase the surface area
Store waste
Produce bile
Explanation: The many villi greatly increase the absorbing surface area.
Question 29 of 30
Glucose and amino acids are absorbed from the villi mainly into the:
Lymph vessel
Blood capillaries
Stomach
Liver duct
Explanation: Glucose and amino acids pass into the blood capillaries of the villi.
Question 30 of 30
The use of absorbed nutrients by body cells for energy, growth, and repair is called:
Absorption
Assimilation
Digestion
Egestion
Explanation: Assimilation is the cells' use of nutrients for energy, growth, and repair.