Biology
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Life processes (Movement, Respiration, Sensitivity, Growth, Reproduction, Excretion, Nutrition)
SubtopicLife processes (Movement, Respiration, Sensitivity, Growth, Reproduction, Excretion, Nutrition) under Biology for Grade 4 IGCSE.
Preview questions (no answers)
- 1.
An organism becomes taller and heavier. This is an example of:
A.Sensitivity
B.Respiration
C.Growth
D.Movement
- 2.
Which process involves getting rid of excess water and salts from the body?
A.Excretion
B.Nutrition
C.Reproduction
D.Growth
- 3.
The process of releasing energy from food happens in which parts of a living thing?
A.Only the stomach
B.Only the lungs
C.Every living cell
D.Only the skin
- 4.
When a person's pupils get smaller in bright light, they are showing:
A.Growth
B.Excretion
C.Sensitivity
D.Nutrition
- 5.
An explorer finds a strange object and records what it can and cannot do in the diagram below. Based on these observations, which two life processes is the object failing to show?
A.Movement and Growth
B.Sensitivity and Excretion
C.Respiration and Nutrition
D.Growth and Reproduction
- 6.
Which of these waste products is excreted by both plants and animals?
A.Oxygen
B.Carbon dioxide
C.Glucose
D.Urine
- 7.
A person feels cold and starts to shiver. The feeling of being cold is the _____, and the shivering is the _____.
A.Response; Stimulus
B.Excretion; Nutrition
C.Stimulus; Response
D.Growth; Movement
- 8.
Which of the following describes 'Sensitivity' in a root?
A.The root absorbing water from the soil
B.The root growing away from light and toward gravity
C.The root storing starch for later use
D.The root anchoring the plant firmly in the ground
- 9.
During the day, a plant produces oxygen. What is the plant doing with this oxygen?
A.It excretes some of it as waste and uses some for respiration
B.It turns all of it into glucose for nutrition
C.It uses all of it for growth and reproduction
D.It stores all of it in the roots for the winter
- 10.
A scientist measures the mass of a young rabbit every day for a month. Which life process are they studying?
A.Respiration
B.Movement
C.Growth
D.Excretion
Download the worksheet for Biology - Life processes (Movement, Respiration, Sensitivity, Growth, Reproduction, Excretion, Nutrition) to practice offline. It includes additional chapter-level practice questions.
Parts of a flowering plant and their functions
SubtopicParts of a flowering plant and their functions under Biology for Grade 4 IGCSE.
Preview questions (no answers)
- 1.
Which part of the plant grows downwards due to gravity?
A.Flower
B.Leaf
C.Stem
D.Root
- 2.
What is the main role of the stem during the plant's life?
A.Anchoring
B.Transportation of water
C.Attracting bees
D.Producing seeds
- 3.
Which of these parts is NOT part of a typical flower?
A.Stamen
B.Carpel
C.Petal
D.Root hair
- 4.
What part of the plant is a carrot?
A.A leaf
B.A flower
C.A root
D.A fruit
- 5.
Which part of the flower is often green and leaf-like, found at the very base of the petals?
A.The filament
B.The ovary
C.The sepal
D.The stigma
- 6.
What happens to a plant if its stem is severely damaged?
A.It will grow more roots to compensate
B.It will struggle to transport water and may wilt
C.It will start making food in its roots
D.It will flower immediately
- 7.
Which of these best describes the role of a pollinator?
A.It eats the plant's leaves
B.It carries pollen from one flower to another
C.It plants the seeds in the ground
D.It provides water to the roots
- 8.
A plant is placed in a window. After a week, the leaves are all facing the glass. If the plant is rotated 180 degrees, what will most likely happen over the next few days?
A.The leaves will stay where they are and the plant will grow a new set of leaves facing the window.
B.The leaves will gradually turn back toward the window to catch the light.
C.The plant will stop growing because it is confused by the rotation.
D.The roots will grow out of the soil to try and find the light.
- 9.
What is the primary function of the sepals in a flowering plant?
A.To attract pollinators with their green color.
B.To protect the flower when it is still in the bud stage.
C.To produce the seeds after the petals fall off.
D.To capture sunlight for the flower to grow.
- 10.
Some plants have special structures called 'nectaries' at the base of their flowers. What is the primary function of the liquid produced by these structures?
A.To provide a drink for the plant when the soil is dry.
B.To glue the pollen grains onto the stigma.
C.To act as a reward for insects that assist in pollination.
D.To wash the dust off the leaves of the plant.
Download the worksheet for Biology - Parts of a flowering plant and their functions to practice offline. It includes additional chapter-level practice questions.
The human skeleton and muscular system
SubtopicThe human skeleton and muscular system under Biology for Grade 4 IGCSE.
Preview questions (no answers)
- 1.
Which part of the skeletal system is made of bones that form the head?
A.Cranium
B.Carpals
C.Tarsals
D.Vertebrae
- 2.
How many pairs of ribs do most humans have?
A.5
B.12
C.20
D.2
- 3.
What is the name of the tissue that connects one bone to another bone at a joint?
A.Muscle
B.Ligament
C.Skin
D.Nerve
- 4.
Which joint is found between the thigh bone and the shin bone?
A.Elbow
B.Wrist
C.Knee
D.Shoulder
- 5.
How does exercise help the muscular system?
A.It makes the muscles disappear
B.It makes the muscles weaker
C.It makes the muscles thicker and stronger
D.It changes the muscles into fat
- 6.
Which of these bones is found in the ankle?
A.Carpals
B.Metacarpals
C.Tarsals
D.Phalanges
- 7.
When a muscle 'relaxes', what happens to its shape?
A.It becomes shorter and fatter
B.It becomes longer and thinner
C.It turns into bone
D.It stays exactly the same
- 8.
The shoulder and the hip are both joints, but they have different structures. Based on the diagram, why is the deep socket of Joint 2 a necessary adaptation for the hip?
A.It allows the leg to swing in a much larger circle than the arm can.
B.It makes the bones in the hip more flexible than the bones in the shoulder.
C.It provides the stability required to hold up the weight of the upper body.
D.It prevents the from leaking out of the joint.
- 9.
When you straighten your arm, which muscle is contracting?
A.Bicep
B.Tricep
C.Deltoid
D.Abdominal
- 10.
The and are bones found where?
A.The lower leg
B.The forearm
C.The rib cage
D.The spine
Download the worksheet for Biology - The human skeleton and muscular system to practice offline. It includes additional chapter-level practice questions.
Human digestive system and healthy diets
SubtopicHuman digestive system and healthy diets under Biology for Grade 4 IGCSE.
Preview questions (no answers)
- 1.
Which organ helps to get rid of the solid waste that the body cannot use?
A.Stomach
B.Heart
C.Large Intestine
D.Lungs
- 2.
Which of these should be eaten in small amounts only?
A.Fruits
B.Vegetables
C.Sugary sweets
D.Proteins
- 3.
Why is it important to chew food into small pieces?
A.To make it taste salty
B.To make it easier to swallow and digest
C.To change its color
D.To make it colder
- 4.
What is the name for the set of teeth humans get as adults?
A.Milk teeth
B.Permanent teeth
C.Baby teeth
D.Gold teeth
- 5.
What is the relationship between food and exercise?
A.Food provides the energy needed for exercise
B.Exercise is more important than food
C.Eating more food makes you exercise faster
D.You should only eat after exercising
- 6.
Which of these would be the most scientific way to measure how much energy is in a food item?
A.Measuring its weight
B.Looking at the color of the food
C.Checking the 'Calories' or 'Kilojoules' on the label
D.Counting how many bites it takes to eat it
- 7.
What is the primary function of the rectum in the digestive system?
A.Absorbing vitamins
B.Storing feces before they leave the body
C.Breaking down fats
D.Mixing food with saliva
- 8.
Which of the following describes the correct path taken by a piece of apple after it is swallowed?
A.Mouth -> Oesophagus -> Stomach -> Small Intestine -> Large Intestine
B.Mouth -> Stomach -> Oesophagus -> Large Intestine -> Small Intestine
C.Oesophagus -> Mouth -> Small Intestine -> Stomach -> Large Intestine
D.Mouth -> Oesophagus -> Large Intestine -> Small Intestine -> Stomach
- 9.
In an experiment, starch is mixed with saliva in a test tube. After 20 minutes, the starch has disappeared and sugar is present. What does this prove?
A.Saliva is made of sugar.
B.Saliva contains an enzyme that breaks starch down into sugar.
C.The starch evaporated into the air.
D.The test tube turned the starch into sugar because of the heat.
- 10.
What is the specific role of the 'premolars' in the digestive process?
A.They are the sharpest teeth for biting into apples.
B.They are used to tear meat away from bones.
C.They have a flat surface with ridges to help crush and grind food.
D.They are only used for speaking and do not help with food.
Download the worksheet for Biology - Human digestive system and healthy diets to practice offline. It includes additional chapter-level practice questions.
Habitats, ecosystems, and adaptations
SubtopicHabitats, ecosystems, and adaptations under Biology for Grade 4 IGCSE.
Preview questions (no answers)
- 1.
Which of these would be a threat to a forest habitat?
A.Planting more trees
B.Cutting down all the trees for wood
C.Rain falling
D.Birds building nests
- 2.
What do we call a scientist who studies how living things interact with their environment?
A.A geologist
B.An ecologist
C.An astronomer
D.A chemist
- 3.
Which animal is a herbivore found in a grassland habitat?
A.Lion
B.Zebra
C.Leopard
D.Hyena
- 4.
What is the main source of energy for all food chains?
A.Water
B.Sunlight
C.Electricity
D.Soil
- 5.
Why do some desert animals stay underground in burrows during the heat of the day?
A.To find more food that grows underground
B.To avoid the extreme heat and stay cool
C.Because they cannot see in the bright sunlight
D.To practice digging deeper tunnels
- 6.
A pufferfish can inflate its body with water or air to look much larger and show sharp spines. This is an adaptation for:
A.Swimming faster to catch small fish
B.Discouraging predators from eating it
C.Attracting a mate in the coral reef
D.Floating on the surface to get more sunlight
- 7.
Which of these animals is best adapted for a life spent mostly in the trees (arboreal)?
A.An elephant with a long trunk
B.A monkey with a prehensile (grasping) tail
C.A mole with shovel-like front paws
D.A seal with streamlined flippers
- 8.
A species of owl has soft fringes on its wing feathers that allow it to fly almost silently. How does this adaptation most help the owl survive?
A.It helps the owl stay warm during the night.
B.It allows the owl to fly faster than other birds.
C.It allows the owl to sneak up on prey without being heard.
D.It prevents the owl from being seen by predators.
- 9.
What is the primary source of energy for almost all ecosystems on Earth?
A.The Moon
B.The Earth's core
C.The Sun
D.Volcanoes
- 10.
Some animals, like the North American Wood Frog, can actually freeze partially during winter and then 'thaw out' and come back to life in the spring. This is an adaptation to which environmental challenge?
A.Extreme heat in the summer.
B.Lack of food in the desert.
C.Extreme cold temperatures in sub-arctic habitats.
D.The need to hide from predators by pretending to be a rock.
Download the worksheet for Biology - Habitats, ecosystems, and adaptations to practice offline. It includes additional chapter-level practice questions.
Food chains and energy flow
SubtopicFood chains and energy flow under Biology for Grade 4 IGCSE.
Preview questions (no answers)
- 1.
Which of these animals is a predator that lives in the Arctic?
A.Polar bear
B.Seal
C.Fish
D.Krill
- 2.
What is the source of energy that plants use to make their food?
A.Rain
B.Soil
C.Sunlight
D.Wind
- 3.
A chimpanzee eats fruits, leaves, and occasionally small monkeys. It is an:
A.Omnivore
B.Herbivore
C.Producer
D.Autotroph
- 4.
Which of these is a producer that grows in a desert?
A.Scorpion
B.Cactus
C.Lizard
D.Camel
- 5.
Which of these lists contains ONLY consumers?
A.Grass, Rabbit, Fox
B.Caterpillar, Bird, Cat
C.Wheat, Mouse, Owl
D.Rose, Bee, Spider
- 6.
Which organism would be the most suitable to complete this food chain?
A.Small fish
B.Oak tree
C.Eagle
D.Lion
- 7.
What is the name for an animal that hunts and eats other animals?
A.Prey
B.Predator
C.Producer
D.Vegetarian
- 8.
What would be the most immediate effect of removing all the producers from an ecosystem?
A.The primary consumers would have nothing to eat and would starve.
B.The secondary consumers would start eating each other immediately.
C.The decomposers would double in population to replace them.
D.The sun's energy would be absorbed directly by the animals.
- 9.
In a rainforest, which of the following would be considered a 'secondary consumer'?
A.A fruit bat eating mangoes
B.A mahogany tree reaching for sunlight
C.A jaguar eating a caiman (which eats fish)
D.A spider eating a fly (which eats nectar)
- 10.
Why do plants need to produce more energy than they actually pass on to the herbivores that eat them?
A.To save energy for the winter.
B.To use for their own growth, respiration, and reproduction.
C.Because herbivores only eat the leaves and not the roots.
D.To make sure the predators don't get too much energy.
Download the worksheet for Biology - Food chains and energy flow to practice offline. It includes additional chapter-level practice questions.