Biology
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Transport in Plants (Xylem, Phloem, Osmosis, Transpiration)
SubtopicTransport in Plants (Xylem, Phloem, Osmosis, Transpiration) under Biology for Grade 8 ICSE.
Preview questions (no answers)
- 1.
If the concentration of water molecules is the same inside and outside the cell, the solution is said to be:
A.Hypotonic
B.Hypertonic
C.Isotonic
D.Dilute
- 2.
Sieve plates are found at the end walls of which cells?
A.Xylem vessels
B.Tracheids
C.Sieve tubes
D.Root hairs
- 3.
Which process requires the expenditure of metabolic energy ()?
A.Diffusion
B.Osmosis
C.Active Transport
D.Transpiration
- 4.
The liquid found inside the central vacuole of a plant cell is called:
A.Cytoplasm
B.Cell sap
C.Nucleoplasm
D.Blood
- 5.
In the mechanism of stomatal opening, what happens to the guard cells when they take in water?
A.They become flaccid and close the pore
B.They become turgid and the pore opens
C.They shrink and the pore opens
D.They remain unchanged
- 6.
A cell becomes flaccid when it is placed in a solution that is:
A.Isotonic
B.Hypotonic
C.Hypertonic
D.Pure water
- 7.
Which part of the plant helps in the exchange of gases and also participates in a small amount of transpiration in woody stems?
A.Stomata
B.Lenticels
C.Root hairs
D.Phloem
- 8.
Identify the incorrect statement about 'Phloem Fibres':
A.They provide mechanical strength to the plant.
B.They are made of dead sclerenchyma cells.
C.They are involved in the active translocation of sucrose.
D.They are also known as 'bast fibres'.
- 9.
Which of these processes is responsible for the 'unloading' of sugar at the sink (e.g., a growing fruit)?
A.Osmosis followed by passive diffusion.
B.Active transport requiring energy to move sugar out of the sieve tube.
C.Transpiration pull dragging the sugar into the fruit.
D.Gravity pulling the sugar downwards.
- 10.
Why is the xylem considered a 'complex' tissue?
A.Because it is difficult to see under a microscope.
B.Because it consists of more than one type of cell working together.
C.Because it can transport both water and food.
D.Because it is found in both the roots and the stem.
Download the worksheet for Biology - Transport in Plants (Xylem, Phloem, Osmosis, Transpiration) to practice offline. It includes additional chapter-level practice questions.
Reproduction in Plants (Sexual and Asexual, Pollination, Fertilization)
SubtopicReproduction in Plants (Sexual and Asexual, Pollination, Fertilization) under Biology for Grade 8 ICSE.
Preview questions (no answers)
- 1.
Which of these plants has seeds that are usually dispersed by wind, aiding in its reproduction cycle?
A.Coconut
B.Dandelion
C.Mango
D.Xanthium
- 2.
The protective outer layer of a seed is called the:
A.Embryo
B.Endosperm
C.Seed coat
D.Cotyledon
- 3.
A fruit is essentially a:
A.Fertilized ovule
B.Ripened ovary
C.Developed embryo
D.Modified leaf
- 4.
Non-flowering plants like ferns and mosses reproduce through:
A.Seeds
B.Spores
C.Buds
D.Fruits
- 5.
Which of the following is NOT a requirement for the germination of most seeds?
A.Water
B.Oxygen
C.Suitable temperature
D.Fertilizer
- 6.
The stalk of an individual flower in an inflorescence is known as the:
A.Peduncle
B.Pedicel
C.Petiole
D.Filament
- 7.
Which plant organ is modified into a 'Bulb' for reproduction in Garlic?
A.Root
B.Stem
C.Flower
D.Fruit
- 8.
Identify the incorrect statement regarding 'Double Fertilization'.
A.It involves two acts of fusion in the same embryo sac.
B.It results in the formation of both a diploid zygote and a triploid primary endosperm nucleus.
C.It is a characteristic feature found in all bryophytes and pteridophytes.
D.It ensures that nutritive tissue is formed only if fertilization is successful.
- 9.
In aquatic plants like Pistia (Water Lettuce), the horizontal branch of the stem that arises from the leaf axil and produces a rosette of leaves is called a/an:
A.Stolon
B.Runner
C.Offset
D.Sucker
- 10.
Which of the following is a disadvantage of vegetative propagation?
A.It is a very slow process compared to sexual reproduction.
B.The offspring are genetically identical, making them susceptible to the same diseases.
C.It requires the presence of two parent plants for successful growth.
D.It produces plants that are more resilient to environmental changes.
Download the worksheet for Biology - Reproduction in Plants (Sexual and Asexual, Pollination, Fertilization) to practice offline. It includes additional chapter-level practice questions.
Reproduction in Animals (Sexual and Asexual, Metamorphosis)
SubtopicReproduction in Animals (Sexual and Asexual, Metamorphosis) under Biology for Grade 8 ICSE.
Preview questions (no answers)
- 1.
In external fertilization, the fusion of gametes takes place:
A.In the air
B.Outside the female body
C.Inside the male body
D.Inside the uterus
- 2.
Which of these is a male reproductive organ in humans?
A.Ovary
B.Uterus
C.Testis
D.Oviduct
- 3.
A hen's egg is actually:
A.A tissue
B.An organ
C.A single cell
D.An organ system
- 4.
Which of these is NOT a stage in the life cycle of a frog?
A.Egg
B.Tadpole
C.Caterpillar
D.Adult frog
- 5.
Which of the following statements about sexual reproduction is TRUE?
A.It involves only one parent.
B.It results in offspring that are identical to the parent.
C.It involves the fusion of male and female gametes.
D.It is a faster process than asexual reproduction.
- 6.
A tadpole uses which of the following to swim in water?
A.Lungs
B.Fins
C.Tail
D.Forelimbs
- 7.
In human females, the fallopian tubes are the site for which biological process?
A.Production of eggs
B.Implantation of the embryo
C.Fertilization
D.Production of estrogen
- 8.
Why is the process of 'Metamorphosis' considered an advantage for the survival of certain species like frogs?
A.It allows the young and adults to occupy different niches and use different food sources, reducing competition.
B.It ensures that the organism can reproduce asexually if no mates are found.
C.It makes the organism immune to all types of water pollution.
D.It allows the organism to bypass the zygote stage entirely.
- 9.
In the context of the male reproductive tract, what is the path taken by the sperm from its site of production to the point of exit from the body?
A.Urethra Vas deferens Testes
B.Testes Vas deferens Urethra
C.Testes Ureter Urethra
D.Vas deferens Testes Urethra
- 10.
A farmer notices that his chickens' eggs have a much thinner shell than usual. This could be dangerous for the developing embryo primarily because:
A.The embryo will not be able to get enough sunlight.
B.The egg will lose water too quickly (desiccation) and be more susceptible to mechanical damage.
C.The embryo will grow too large for the shell.
D.The sperm will not be able to fertilize the egg through the thin shell.
Download the worksheet for Biology - Reproduction in Animals (Sexual and Asexual, Metamorphosis) to practice offline. It includes additional chapter-level practice questions.
Ecosystems (Biotic and Abiotic components, Food chains, Food webs)
SubtopicEcosystems (Biotic and Abiotic components, Food chains, Food webs) under Biology for Grade 8 ICSE.
Preview questions (no answers)
- 1.
Which abiotic factor varies with the depth of the ocean?
A.The number of whales
B.The amount of light
C.The presence of fish
D.The species of coral
- 2.
Which of these is a characteristic of a food web?
A.It is a single straight line
B.It shows only one predator
C.It consists of many interconnected food chains
D.It does not include producers
- 3.
What is the function of the 'producers' in an ecosystem?
A.To consume other animals
B.To convert solar energy into chemical energy
C.To decompose dead plants
D.To provide shelter to herbivores
- 4.
Which of the following is a biotic factor?
A.Water
B.Soil
C.Earthworm
D.Air
- 5.
In a mountain ecosystem, as altitude increases, the temperature usually decreases. This is an example of:
A.A biotic factor affecting an abiotic factor
B.An abiotic factor influencing the distribution of biotic components
C.A food chain interaction
D.Commensalism between air and land
- 6.
What is the primary function of chlorophyll in the biotic component of an ecosystem?
A.To digest other organisms
B.To absorb light energy for food production
C.To store water in desert plants
D.To provide structural support to the stems
- 7.
Which of the following sets consists only of abiotic components?
A.Soil, Water, Bacteria
B.Temperature, Sunlight, Fungi
C.Air, Minerals, Temperature
D.Plants, Animals, Soil
- 8.
In an ecosystem, the energy an organism consumes is divided between 'Energy for Survival' (metabolism) and 'Energy for Growth' (biomass), as shown in the provided model. If an abiotic factor like extreme cold significantly increases the energy required for 'Survival' in primary consumers, which of the following describes the most likely impact on the biotic structure of the food web?
A.The population of top predators will increase as they hunt more frequently to obtain the necessary energy.
B.The energy available for the next trophic level will decrease, potentially reducing the total number of levels the ecosystem can support.
C.The producers will automatically increase their rate of photosynthesis to compensate for the higher metabolic needs of the consumers.
D.The energy lost as heat will be recycled through the soil to increase the efficiency of the rule.
- 9.
Which of the following is NOT an abiotic component of an ecosystem?
A.Nitrogen-fixing bacteria in the soil
B.Dissolved oxygen in water
C.Solar radiation
D.Clay particles in soil
- 10.
Which of these represents a 'top-down' effect in a lake ecosystem?
A.Introducing predatory fish that reduce the population of zooplankton-eating fish.
B.Adding fertilizer to increase the growth of phytoplankton.
C.Increasing the temperature to speed up bacterial decomposition.
D.Draining the lake to expose the bottom sediment.
Download the worksheet for Biology - Ecosystems (Biotic and Abiotic components, Food chains, Food webs) to practice offline. It includes additional chapter-level practice questions.
Endocrine System and Adolescence (Hormones, Growth, Stress management)
SubtopicEndocrine System and Adolescence (Hormones, Growth, Stress management) under Biology for Grade 8 ICSE.
Preview questions (no answers)
- 1.
Which part of the cell carries the instructions for determining the sex of the baby?
A.Cytoplasm
B.Mitochondria
C.Chromosomes
D.Cell membrane
- 2.
Drugs are addictive. Once taken, there is an urge to take them again and again. What is the best way to stay away from drugs?
A.Try them once to see
B.Say 'No' firmly
C.Follow friends who use them
D.Use them only during stress
- 3.
Which hormone controls the metamorphosis (change from larva to adult) in frogs?
A.Insulin
B.Thyroxine
C.Adrenaline
D.Growth Hormone
- 4.
Which endocrine gland is active during early childhood but tends to shrink after puberty?
A.Thymus gland
B.Thyroid gland
C.Pancreas
D.Pituitary gland
- 5.
The endocrine system is slower than the nervous system because:
A.Hormones travel through blood whereas nerve impulses travel through fibers.
B.Endocrine glands are located far from the brain.
C.Hormones are larger than neurotransmitters.
D.Hormones are only released at night.
- 6.
Which hormone levels decrease sharply, leading to the onset of menstruation?
A.Thyroxine and Insulin
B.Adrenaline and Cortisol
C.Estrogen and Progesterone
D.Growth Hormone and TSH
- 7.
Over-secretion of Growth Hormone in adults, after the growth of long bones has ceased, leads to a condition called:
A.Gigantism
B.Acromegaly
C.Cretinism
D.Goitre
- 8.
Why is the Pituitary gland considered the 'Master Gland'?
A.It is the largest gland in the human body
B.It produces hormones that control the activity of several other endocrine glands
C.It is the only gland that can survive without a blood supply
D.It produces all the hormones required by the body
- 9.
Which endocrine disorder is characterized by 'low blood pressure, loss of energy, and skin pigmentation'?
A.Addison's Disease
B.Cushing's Syndrome
C.Diabetes Mellitus
D.Acromegaly
- 10.
What is the specific role of the Follicle Stimulating Hormone (FSH) in females?
A.It triggers the shedding of the uterine lining
B.It stimulates the maturation of the Graafian follicle in the ovary
C.It causes the secretion of milk from mammary glands
D.It decreases the heart rate during sleep
Download the worksheet for Biology - Endocrine System and Adolescence (Hormones, Growth, Stress management) to practice offline. It includes additional chapter-level practice questions.
The Circulatory System (Heart, Blood vessels, Blood groups, Lymph)
SubtopicThe Circulatory System (Heart, Blood vessels, Blood groups, Lymph) under Biology for Grade 8 ICSE.
Preview questions (no answers)
- 1.
The circulation of blood between the heart and the various organs of the body (excluding the lungs) is called:
A.Pulmonary circulation
B.Systemic circulation
C.Renal circulation
D.Hepatic circulation
- 2.
Which protein present in plasma is primarily responsible for blood clotting?
A.Hemoglobin
B.Insulin
C.Fibrinogen
D.Pepsin
- 3.
What happens when a person with blood group A receives blood from a person with blood group B?
A.Nothing happens
B.The blood flows faster
C.The blood cells clump together (agglutination)
D.The blood turns blue
- 4.
The scientific name for blood platelets is:
A.Erythrocytes
B.Leukocytes
C.Thrombocytes
D.Phagocytes
- 5.
During heavy exercise, why does the heart rate increase?
A.To decrease the blood pressure
B.To supply more oxygen and nutrients to the working muscles
C.To stop the production of sweat
D.To store more carbon dioxide in the blood
- 6.
The wall separating the right and left sides of the heart is called the:
A.Pericardium
B.Septum
C.Endocardium
D.Valve
- 7.
What is the role of 'Heparin' found in the blood?
A.To help in the formation of a blood clot
B.To act as an anticoagulant and prevent blood from clotting inside the vessels
C.To transport iron to the bone marrow
D.To stimulate the production of more Red Blood Cells
- 8.
What prevents the blood from clotting within the blood vessels of a healthy individual?
A.The presence of Prothrombin
B.The constant flow of blood
C.The presence of natural anti-coagulant Heparin
D.The absence of Calcium ions in the blood
- 9.
An increase in the number of Eosinophils in a blood report (Eosinophilia) is usually an indicator of:
A.Bacterial infection
B.Allergic reactions or parasitic infections
C.Iron deficiency anemia
D.High altitudes
- 10.
The 'Bundle of His' is a collection of heart muscle cells specialized for electrical conduction. Where is it specifically located?
A.In the wall of the Right Atrium
B.In the Interventricular Septum
C.In the walls of the Left Ventricle
D.At the junction of the Vena Cava and Right Atrium
Download the worksheet for Biology - The Circulatory System (Heart, Blood vessels, Blood groups, Lymph) to practice offline. It includes additional chapter-level practice questions.
The Nervous System (Brain, Spinal cord, Reflex action)
SubtopicThe Nervous System (Brain, Spinal cord, Reflex action) under Biology for Grade 8 ICSE.
Preview questions (no answers)
- 1.
The part of the neuron that terminates in small bulb-like structures to pass signals is the:
A.Dendrite
B.Axon terminal
C.Cyton
D.Node
- 2.
Which layer of the meninges is thin and web-like?
A.Dura mater
B.Arachnoid
C.Pia mater
D.Gray mater
- 3.
Which of the following represents the correct sequence of messages in a reflex action?
A.Motor -> Sensory -> Brain
B.Receptor -> Sensory -> Spinal Cord -> Motor -> Effector
C.Effector -> Motor -> Spinal Cord -> Receptor
D.Brain -> Motor -> Sensory -> Effector
- 4.
The spinal cord ends in a bundle of nerves at its lower end called the:
A.Pons
B.Cauda equina
C.Cerebrum
D.Medulla
- 5.
Which of the following cranial nerves is responsible for the sense of smell?
A.Optic nerve
B.Auditory nerve
C.Olfactory nerve
D.Vagus nerve
- 6.
What happens when a person's cerebellum is injured?
A.They lose their memory completely
B.Their heartbeat stops immediately
C.Their movements become jerky and uncoordinated
D.They cannot sense pain or temperature
- 7.
A 'nerve' is technically defined as a bundle of:
A.Cytons
B.Dendrites
C.Axons
D.Meninges
- 8.
What is the destination of an impulse traveling through an 'Efferent' nerve fiber?
A.The Spinal Cord
B.The Brain
C.An Effector (Muscle or Gland)
D.A Sensory Receptor
- 9.
Which of the following describes the correct order of an impulse passing through a single neuron?
A.Axon -> Cell Body -> Dendrite
B.Dendrite -> Cell Body -> Axon
C.Cell Body -> Dendrite -> Axon
D.Axon -> Dendrite -> Cell Body
- 10.
The 'Somatic Nervous System' is a part of the Peripheral Nervous System that primarily controls:
A.Involuntary actions of smooth muscles.
B.Voluntary movements of skeletal muscles.
C.Secretions of the endocrine glands.
D.Automatic responses of the heart and lungs.
Download the worksheet for Biology - The Nervous System (Brain, Spinal cord, Reflex action) to practice offline. It includes additional chapter-level practice questions.
Diseases and First Aid (Communicable and Non-communicable diseases)
SubtopicDiseases and First Aid (Communicable and Non-communicable diseases) under Biology for Grade 8 ICSE.
Preview questions (no answers)
- 1.
A person having difficulty seeing in dim light is likely suffering from a deficiency of:
A.Vitamin D
B.Vitamin A
C.Vitamin B12
D.Vitamin C
- 2.
What is the pathogen that causes AIDS?
A.Bacteria
B.HIV (Virus)
C.Plasmodium
D.Fungi
- 3.
Which of the following is a symptom of Iron deficiency?
A.Pale skin and fatigue
B.Bowing of legs
C.Bleeding gums
D.Swelling of joints
- 4.
Which disease is spread through the consumption of contaminated water?
A.Tuberculosis
B.Cholera
C.Asthma
D.Dengue
- 5.
Lack of Vitamin K in the body leads to:
A.Night blindness
B.Inability of blood to clot efficiently
C.Bleeding gums
D.Deformed bones
- 6.
Which of the following is a communicable disease caused by a virus and leads to swelling of the parotid glands?
A.Measles
B.Mumps
C.Influenza
D.Chickenpox
- 7.
A person has accidentally touched a live electric wire. What is the very first step the rescuer should take?
A.Pull the person away with bare hands
B.Turn off the main power supply
C.Pour water on the person to cool the shock
D.Check the person's pulse immediately
- 8.
Which non-communicable condition involves the 'Degeneration' of the myelin sheath of neurons, leading to loss of muscle control?
A.Multiple Sclerosis
B.Cerebral Palsy
C.Parkinson's Disease
D.Alzheimer's Disease
- 9.
A person with 'Type O negative' blood is often called a 'Universal Donor' in first aid/emergencies because:
A.Their blood contains all types of antibodies.
B.Their red blood cells lack both A and B antigens as well as the Rh factor.
C.Their plasma contains no antibodies against A or B antigens.
D.Their blood has a higher oxygen-carrying capacity than other types.
- 10.
What is the causative agent of 'Syphilis', and how is it primarily transmitted?
A.Treponema pallidum (Bacterium); through sexual contact.
B.Human Immunodeficiency Virus; through blood transfusion.
C.Neisseria gonorrhoeae (Bacterium); through contaminated water.
D.Trichomonas vaginalis (Protozoan); through the air.
Download the worksheet for Biology - Diseases and First Aid (Communicable and Non-communicable diseases) to practice offline. It includes additional chapter-level practice questions.
Food Production (Agriculture, Animal Husbandry, Organic Farming)
SubtopicFood Production (Agriculture, Animal Husbandry, Organic Farming) under Biology for Grade 8 ICSE.
Preview questions (no answers)
- 1.
In animal husbandry, the term 'apiary' refers to:
A.A place where fish are kept
B.A place where honey bee hives are kept
C.A place where silkworms are reared
D.A place where cows are milked
- 2.
Which of these is a widely used nitrogenous fertilizer?
A.Potash
B.Superphosphate
C.Urea
D.Compost
- 3.
High moisture content in stored grains leads to the growth of:
A.Crystals
B.Flowers
C.Fungi and bacteria
D.Vitamins
- 4.
Which of the following is a draught animal used for pulling carts and ploughing?
A.Goat
B.Bullock
C.Hen
D.Sheep
- 5.
In a composite fish culture system, multiple fish species are raised in the same pond to ensure that food at all depths is utilized. Based on the vertical distribution of feeding zones shown below, which fish species should correctly replace 'X'?
A.Rohu
B.Silver Carp
C.Common Carp
D.Calbasu
- 6.
Agricultural scientists often develop new crop varieties to combine desirable characteristics from different parents. Study the process shown in the diagram. What is the specific term for this method of crop improvement used to produce 'Variety X'?
A.Selection
B.Hybridization
C.Polyculture
D.Transplantation
- 7.
Which of the following is a common poultry disease?
A.Foot and mouth disease
B.Ranikhet disease
C.Anthrax
D.Rinderpest
- 8.
Which of the following is a major 'Macronutrient' required by plants for the synthesis of proteins and nucleic acids?
A.Zinc
B.Manganese
C.Nitrogen
D.Copper
- 9.
What is the primary advantage of 'Transplantation' in the cultivation of crops like Paddy and Chillies?
A.It saves the farmer from the work of preparing the main field.
B.It allows the selection of only healthy and vigorous seedlings for the main field.
C.It reduces the water requirement of the crop by 50%.
D.It ensures that no weeds grow in the main field.
- 10.
In the context of 'Organic Farming', what does the term 'In situ' conservation of soil fertility refer to?
A.Bringing manure from outside the farm to enrich the soil.
B.Conserving soil nutrients by preventing erosion and using cover crops on the same field.
C.Removing the topsoil and treating it in a laboratory before replacing it.
D.Using chemical fertilizers only in specific spots where nutrients are low.
Download the worksheet for Biology - Food Production (Agriculture, Animal Husbandry, Organic Farming) to practice offline. It includes additional chapter-level practice questions.