In which part of the human digestive system does maximum absorption of digested food nutrients take place into the bloodstream[cite: 1]?
Explanation: The small intestine has millions of tiny finger-like projections called villi that absorb digested nutrients into the blood[cite: 1]. The large intestine mainly absorbs water[cite: 1].
Which type of joint allows movement in almost all directions (360-degree rotation), such as the joint present in our shoulder and hip[cite: 1]?
Explanation: In a ball and socket joint, the rounded end of one bone fits into the hollow space (socket) of another, allowing maximum rotational movement[cite: 1].
A child has weak, soft bones that bend easily (Rickets). Which deficiency in the diet is primarily responsible for this disease[cite: 1]?
Explanation: Vitamin D and Calcium are necessary for strong bones[cite: 1]. Deficiency of Vitamin D causes Rickets in children[cite: 1].
Which part of the human brain controls involuntary actions like heartbeat, breathing, and blood pressure[cite: 1]?
Explanation: The Medulla Oblongata (brain stem) controls involuntary bodily functions like respiration and heart rate[cite: 1]. Cerebrum controls thinking and Cerebellum controls balance[cite: 1].
Which component of human blood helps in clot formation at the site of a wound to stop bleeding[cite: 1]?
Explanation: Platelets gather at a injury site and form blood clots to prevent excess blood loss[cite: 1].
Seeds of Dandelion and Maple plants have wing-like structures or tufts of hair. How are these seeds primarily dispersed[cite: 1]?
Explanation: Winged seeds and seeds with hairs/tufts are light in weight and easily carried away by the wind[cite: 1].
Which of the following plants can reproduce vegetatively through its leaves[cite: 1]?
Explanation: Bryophyllum leaves have buds along their margins that grow into new plantlets when they drop into moist soil[cite: 1].
Insectivorous plants like Venus Flytrap grow in nitrogen-deficient soil[cite: 1]. How do they obtain the required nitrogen[cite: 1]?
Explanation: Insectivorous plants catch insects and secrete digestive juices to absorb nitrogen compounds[cite: 1].
During photosynthesis, plants take in gas X from air and release gas Y[cite: 1]. Identify X and Y[cite: 1].
Explanation: Plants absorb Carbon dioxide (X) and release Oxygen (Y) as a byproduct during photosynthesis in presence of sunlight[cite: 1].
Crops sown during the monsoon season (June to October) are called Kharif crops[cite: 1]. Which of the following is a Kharif crop[cite: 1]?
Explanation: Rice (Paddy), Maize, and Cotton are Kharif crops grown in rainy season[cite: 1]. Wheat and Mustard are Rabi crops[cite: 1].
Which organ do tadpoles use for breathing underwater before developing into adult frogs[cite: 1]?
Explanation: Tadpoles are aquatic and breathe using gills[cite: 1]. Adult frogs breathe through lungs on land and moist skin in water[cite: 1].
Insects like cockroaches and grasshoppers breathe through tiny holes present along the sides of their bodies[cite: 1]. These openings are called[cite: 1]:
Explanation: Insects have small air openings on their body called spiracles connected to air tubes (tracheae)[cite: 1].
Siberian Cranes migrate from Russia to warmer countries like India during winter mainly for[cite: 1]:
Explanation: Birds migrate to escape extreme cold climate and shortage of food in winter conditions[cite: 1].
Which of the following creatures is a aquatic mammal that gives birth to live young ones and breathes through lungs[cite: 1]?
Explanation: Whales and Dolphins are mammals, not fish[cite: 1]. They breathe air through blowholes using lungs and give birth to young[cite: 1].
In a forest ecosystem food chain: Grass → Grasshopper → Frog → Snake → Eagle[cite: 1]. What happens if the population of frogs suddenly decreases sharply[cite: 1]?
Explanation: Frogs eat grasshoppers[cite: 1]. If frogs decrease, fewer grasshoppers will be eaten, causing grasshopper numbers to increase[cite: 1].
Which state of matter has a fixed volume but NO fixed shape, taking the shape of the container it is placed in[cite: 1]?
Explanation: Liquids have a definite volume because molecules are close together, but no fixed shape because molecules can flow past each other[cite: 1].
Which method is best suited to separate insoluble sand particles suspended in water[cite: 1]?
Explanation: Filtration uses filter paper/mesh to trap insoluble solid impurities (sand) while allowing liquid water to pass through[cite: 1].
Which of the following options represents a permanent **Chemical Change**[cite: 1]?
Explanation: Burning forms a new substance (ash/gases) that cannot be reversed[cite: 1]. Melting, dissolving, and tearing are physical changes[cite: 1].
What happens to the solubility of sugar in water when the temperature of the water is increased[cite: 1]?
Explanation: Heating increases kinetic energy of water molecules, creating more space for solid solutes like sugar to dissolve faster and in larger amounts[cite: 1].
Which pair of liquids are completely **miscible** (mix together completely)[cite: 1]?
Explanation: Milk and water mix together uniformly to form a single liquid phase, so they are miscible[cite: 1]. Oil/petrol float on top (immiscible)[cite: 1].
A pair of scissors is an example of a class of lever where the Fulcrum (F) is situated between the Load (L) and the Effort (E)[cite: 1]. Which class of lever is this[cite: 1]?
Explanation: In Class-1 levers (Crowbar, Scissors, Seesaw), the fulcrum lies in the middle between load and effort[cite: 1].
A toy car is pushed with equal force across four different surfaces[cite: 1]. On which surface will it travel the **furthest distance** before stopping[cite: 1]?
Explanation: Smooth surfaces offer minimum frictional resistance[cite: 1]. Lower friction allows objects to move easily and cover greater distances[cite: 1].
According to science, in which of the following scenarios is **work done**[cite: 1]?
Explanation: Scientific Work is done only when force applied causes displacement (movement) in the direction of force[cite: 1].
When a stretched rubber band is released, stored **Potential Energy** changes into[cite: 1]:
Explanation: Stretched rubber band stores elastic potential energy[cite: 1]. On release, this stored energy converts to motion (Kinetic Energy)[cite: 1].
The upward pushing force exerted by water on an object submerged in it is called[cite: 1]:
Explanation: Liquids exert an upward force called buoyancy or upthrust that causes light objects to float[cite: 1].
During a Solar Eclipse, which celestial body lies directly between the other two in a straight line[cite: 1]?
Explanation: In a solar eclipse, the Moon comes between the Sun and Earth, blocking sunlight from reaching Earth[cite: 1].
In which layer of Earth's atmosphere do weather changes like cloud formation, rain, and storms occur[cite: 1]?
Explanation: The Troposphere is the lowest atmospheric layer containing water vapor where almost all weather phenomena occur[cite: 1].
The Ozone layer situated in the Stratosphere protects life on Earth from harmful[cite: 1]:
Explanation: Ozone ($O_3$) gas absorbs harmful UV radiation from the Sun, preventing skin cancer and cataracts[cite: 1].
The revolution of Earth around the Sun on its tilted axis is responsible for causing[cite: 1]:
Explanation: Earth's revolution (365 days) along with its tilted axis causes seasonal variation[cite: 1]. Earth's rotation causes day and night[cite: 1].
An earthquake's intensity under the Earth's crust is recorded on an instrument called a[cite: 1]:
Explanation: Seismographs measure seismic waves generated by earthquakes[cite: 1]. Magnitude is measured on the Richter scale[cite: 1].
Which lightweight igneous rock forms from frothy lava filled with gas bubbles, and is famous for floating on water[cite: 1]?
Explanation: Pumice is a porous igneous rock containing trapped gas pockets, giving it low density so it floats on water[cite: 1].
Limestone undergoes high heat and pressure inside Earth to transform into which metamorphic rock[cite: 1]?
Explanation: Limestone (sedimentary) metamorphoses into Marble under heat and pressure[cite: 1]. Taj Mahal is built of white marble[cite: 1].
Which layer of soil contains maximum organic decaying material (humus) making it fertile for plant roots[cite: 1]?
Explanation: Topsoil is rich in organic humus and minerals necessary for plant growth[cite: 1].
Coal and Petroleum are non-renewable natural resources formed from[cite: 1]:
Explanation: Heat and pressure inside Earth transformed ancient buried organisms into fossil fuels like coal and petroleum[cite: 1].
Ploughing along contour lines on hilly slopes to slow down water runoff and prevent soil erosion is called[cite: 1]:
Explanation: Terrace farming cuts step-like flat fields on hill slopes to reduce the speed of flowing water, preventing topsoil erosion[cite: 1].
Which gas is majorly responsible for trapping heat in Earth's atmosphere, leading to Global Warming[cite: 1]?
Explanation: Greenhouse gases like $CO_2$ and Methane trap outgoing solar thermal radiation, leading to enhanced global warming[cite: 1].
Using a plastic water bottle repeatedly or turning an old glass jar into a pen holder is an example of which 'R'[cite: 1]?
Explanation: Reuse means finding a new purpose for an item instead of throwing it away[cite: 1]. Recycling involves processing materials into raw form[cite: 1].
Which chemical tablet is commonly added to municipal drinking water tanks to kill germs and bacteria[cite: 1]?
Explanation: Chlorination is the process of adding chlorine gas/tablets to drinking water to disinfect and destroy disease-causing microbes[cite: 1].
Which of the following energy sources is non-polluting and unlimitedly renewable[cite: 1]?
Explanation: Solar, Wind, and Hydro energy are renewable resources that never run out and do not emit harmful pollutants[cite: 1].
Gases like Sulfur Dioxide released from factories mix with water droplets in clouds to form[cite: 1]:
Explanation: Sulfur dioxide and nitrogen oxides dissolve in rainwater droplets to form acidic rain that damages buildings and aquatic life[cite: 1].
Look at the seed cross-section diagram below. Which part provides stored food nourishment to the developing embryo during germination[cite: 1]?
Explanation: Cotyledons (seed leaves) store starch and food reserves used by the embryo until green leaves grow[cite: 1].
In any balanced ecological energy pyramid, which organisms always occupy the base producer level[cite: 1]?
Explanation: Green plants synthesize their own food using sunlight and form the base producer level of all food chains[cite: 1].
Camels have thick leathery pads under their feet, long eyelashes, and can store fat in their humps[cite: 1]. These features adapt them to live in[cite: 1]:
Explanation: Padded feet prevent sinking in sand; long eyelashes block sandstorms; fat in humps provides energy when food/water is scarce[cite: 1].
Which feature helps fish reduce water resistance and swim smoothly through water[cite: 1]?
Explanation: A streamlined body tapered at both ends cuts through fluid easily, minimizing drag[cite: 1].
When an opaque object is illuminated by a point light source, a dark region where no light reaches is formed behind it[cite: 1]. This region is called[cite: 1]:
Explanation: Light travels in straight lines[cite: 1]. When an opaque object blocks light rays, a dark shadow forms on the opposite side[cite: 1].
In an experiment, an inverted glass tumbler pushed vertically down into a trough of water does not fill with water[cite: 1]. This proves that[cite: 1]:
Explanation: The trapped air inside the inverted glass occupies space and prevents water from entering until tilted[cite: 1].
Water droplets forming on the outer surface of a glass filled with ice-cold water is caused by[cite: 1]:
Explanation: Warm air around the cold glass loses heat, causing invisible water vapor to condense into liquid droplets[cite: 1].
Why can astronauts standing on the surface of the Moon NOT hear each other speaking directly without radio equipment[cite: 1]?
Explanation: Sound is a mechanical wave requiring a medium to travel[cite: 1]. Space/Moon is a vacuum, so sound cannot propagate[cite: 1].
Which material can be used to complete an electric circuit switch and conduct electricity[cite: 1]?
Explanation: Metals are good conductors of electricity[cite: 1]. Plastic, wood, and rubber are insulators[cite: 1].
Which bean-shaped organ filters blood to remove liquid metabolic waste and excess water in the form of urine[cite: 1]?
Explanation: A pair of kidneys filter blood, extract urea and toxins, forming urine excreted via ureters[cite: 1].
Which component of our food is known as the "Building Blocks of the Body" required for growth and tissue repair[cite: 1]?
Explanation: Proteins (pulses, milk, eggs) repair damaged tissues and promote growth[cite: 1]. Carbohydrates provide instant energy[cite: 1].
Which disease is transmitted to humans by the bite of an infected female *Anopheles* mosquito[cite: 1]?
Explanation: Female *Anopheles* mosquitoes spread Malaria parasite (*Plasmodium*)[cite: 1]. Dengue is spread by *Aedes* mosquitoes[cite: 1].
Why do vehicle tires have deep tread grooves cut into their rubber surface[cite: 1]?
Explanation: Treads increase surface roughness and road grip, ensuring effective braking without slipping[cite: 1].
Which planet in our Solar System is known as the "Red Planet" due to iron oxide rust on its surface[cite: 1]?
Explanation: Mars appears reddish due to high concentrations of iron oxide dust on its soil and atmosphere[cite: 1].
Which of the following natural fibres is obtained from the cocoon of an insect[cite: 1]?
Explanation: Silk threads are harvested from cocoons spun by silkworm larvae (*Bombyx mori*)[cite: 1].
By which mode of heat transfer does energy from the Sun travel through the vacuum of space to reach Earth[cite: 1]?
Explanation: Radiation transfers heat in electromagnetic waves and does not require any material medium[cite: 1].
The loss of excess water in the form of water vapor from tiny pores (stomata) on plant leaves is termed[cite: 1]:
Explanation: Transpiration cools the plant and creates a suction pull that draws water/minerals up from roots[cite: 1].
Animals without a backbone (vertebral column), such as Earthworms, Snails, and Insects, are classified as[cite: 1]:
Explanation: Animals lacking an internal backbone or spinal column are called invertebrates[cite: 1].
Which sedimentary rock is made up of mineral calcite derived from shells/skeletons of sea creatures and turns lime when heated[cite: 1]?
Explanation: Limestone forms from accumulated marine organisms' shells containing calcium carbonate[cite: 1].
Pickling in oil and salt prevents food spoilage primarily because[cite: 1]:
Explanation: High salt content extracts moisture through osmosis, and oil creates a seal isolating food from airborne microbes[cite: 1].