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All questions of Class 7 Science for CTET & State TET Exam

Which one is an herbivorous organism?
  • a)
    Cow
  • b)
    Tiger
  • c)
    Crow
  • d)
    Dog
Correct answer is option 'A'. Can you explain this answer?

Akanksha Yadav answered
The organisms that feed on only plant or plant part are called herbivores. Cow is an herbivores organism.
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Amoeba obtain the food using finger-like projection called
A: Pseudopodia
B: Spiracles
C: Diaphragm
D: Mouth
Correct answer is 'A'. Can you explain this answer?

Abhay Menon answered
The finger-like projections are called “pseudopodia“. They not only help in engulfing food molecules but also help the organism in movement.

Which one of the following is not an example of natural fibre?
  • a)
    Rayon
  • b)
    Cotton
  • c)
    Wool
  • d)
    Silk
Correct answer is option 'A'. Can you explain this answer?

Rithika Roy answered
Silk, cotton and wood are obtained from natural sources either plant or animal but rayon is a synthetic fibre.

Animals which eat the flesh of other animals are called
  • a)
    Carnivores
  • b)
    Insectivores
  • c)
    Herbivores
  • d)
    Omnivores
Correct answer is option 'A'. Can you explain this answer?

Anoushka Bajaj answered
The animals which eat the flesh of other animals are called carnivores. Tiger, lion etc are example of carnivorous animals.

Q.Silkworms feeds on leaves of
a)Guava
b)Mulberry
c)Banana
d)Mango
Correct answer is option 'B'. Can you explain this answer?

Kavya Rane answered
Silkworms can ONLY survive on mulberry leaves (genus Morus), sometimes Osage orange (Maclura pomifera) or silkworm food, which is made from mulberry leaves. Your worms may eat other types of vegetation, such as lettuce leaves, but it will kill them.

Acid turns blue litmus
A: Orange
B: Pink
C: green
D: Red
Correct answer is 'D'. Can you explain this answer?

Jithin Chawla answered
Acids turn blue litmus red. Litmus paper is used as indicator to check acids and bases.

Conduction takes place best in
a) Gases 
b) All of the above.
c) Liquid 
d) None of these
Correct answer is option 'D'. Can you explain this answer?

Nishanth Ghosh answered
Conduction takes place in solids, liquids and gases, but works best in solids as their atoms/molecules are located closer together.  Metals are the best solids for conducting heat. Metals have tightly packed atoms which can easily pass on their kinetic energy and also have free moving electrons. These electrons can move from the hot part of the metal to the colder part transferring the energy more quickly.

During exhalation, the ribs move
  • a)
    Outwards
  • b)
    Downwards
  • c)
    Upwards
  • d)
    To normal position
Correct answer is option 'B'. Can you explain this answer?

Disha Iyer answered
During exhalation, i.e. releasing air during respiration, the ribs move downwards to reduce the volume of the thoracic cavity.
During exhalation, your diaphragm relaxes and moves upward into the chest cavity. The intercostal muscles between the ribs also relax to reduce the space in the chest cavity. As they relax they position the rib cage downwards and inwards.

The heat in metals is conducted by the process of
A:Absorption
B:Radiation
C:Convection
D:Conduction
The answer is D. Can you explain this?

Anand Choudhury answered
The heat in metals is conducted by the process of conduction in which molecules in contact transfer heat to adjacent molecules.

Which of the following is a natural indicator
  • a)
    Turmeric
  • b)
    Methyl orange
  • c)
    Oxalic acid.
  • d)
    Phenolphthalein
Correct answer is option 'A'. Can you explain this answer?

Sanjana Kumar answered
Some of the natural indicators are red cabbage juice, onion paste, turmeric, lemon juice etc. Natural indicators are turmric,litmus,china rose etc are some natural indicators. Some Natural Indicators are red Cabbage juice,turmeric,china rose[hibiscus] and litmus.

Concave lens is also known as
  • a)
    Converging lens
  • b)
    Diverging lens
  • c)
    Bifocal length
  • d)
    Biconcave lens
Correct answer is option 'B'. Can you explain this answer?

Ananya Choudhary answered
Concave lenses are thinner at the middle. Rays of light that pass through the lens are spread out (they diverge). A concave lens is a diverging lens. When parallel rays of light pass through a concave lens the refracted rays diverge so that they appear to come from one point called the principal focus.

Practice Quiz or MCQ (Multiple Choice Questions) with solutions are available for Practice, which would help you prepare for chapter  Physical and Chemical Changes, Class 7, Science. You can practice these practice quizzes as per your speed and improvise the topic. 
Q.
Melting of ice is a
  • a)
    Both physical and chemical change
  • b)
    Chemical change
  • c)
    Periodic change
  • d)
    Physical change
Correct answer is 'D'. Can you explain this answer?

Maitri Sarkar answered
Melting of ice is a physical change because it involves change only in the physical state of water: from ice in the solid state to water in the liquid state. 
Moreover, no new chemical substance is formed in the process and this change is reversible. Water can be converted back into ice simply by freezing.

A device which prevents or allow the current to flow through it
  • a)
    Motor
  • b)
    Terminal
  • c)
    Conductor
  • d)
    Switch
Correct answer is option 'D'. Can you explain this answer?

Rohini Seth answered
A circuit breaker can be used over and over again. The basic circuit breaker consists of a simple switch, connected to an electromagnet.
Generally electrical current requires a close path or circuit to flow, so when switch is off it won't flow. A switch prevents or allow the current to flow through it.

Ventilation in room is due to
  • a)
    Conduction
  • b)
    Radiation
  • c)
    Convection
  • d)
    Both radiation and conduction
Correct answer is 'C'. Can you explain this answer?

Anagha Choudhury answered
Ventilation is extremely necessary as it circulates air in the house. In this process, convection has the major role, which takes place only in liquids and gases.
There is a constant supply of fresh air and this removes the air present before. If there was no ventilation then the room might stink and there can be a feeling of stuffiness. In the room when air is hot its density decreases and rises up. So ventilators help to move out hot air from the room and lower its temperature.

Silk thread is obtained from
  • a)
    Cocoon
  • b)
    Caterpillar
  • c)
    Pupa
  • d)
    Adult moth
Correct answer is option 'A'. Can you explain this answer?

Meera Reddy answered
The protein fiber of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons. The best-known silk is obtained from the cocoons of the larvae of the mulberry silkworm Bombyx mori reared in captivity (sericulture).

Which one is a type of synthetic fibre?
  • a)
    Nylon
  • b)
    Silk
  • c)
    Cotton
  • d)
    Jute
Correct answer is option 'A'. Can you explain this answer?

Jaya Kumar answered
Cotton, silk and jute are natural fibres obtained from plant and animals. Nylon is a synthetic fibre manufactured by human beings.

In insects, air enters the body through
  • a)
    Spiracles
  • b)
    Gills
  • c)
    Lungs
  • d)
    Skin
Correct answer is option 'A'. Can you explain this answer?

Maitri Sarkar answered
Insect bodies have openings, called spiracles, along the thorax and abdomen. These openings connect to the tubular network, allowing oxygen to pass into the body, regulating the diffusion of CO2 and water vapor. 

 Grass is rich in ________ a special kind of carbohydrate which can only be digested by ruminants.
  • a)
    Glucose
  • b)
    Cellulose
  • c)
    Sucrose
  • d)
    Fructose
Correct answer is option 'B'. Can you explain this answer?

Aarav Sen answered
Cellulose is a type of carbohydrate that can be digested by ruminants and not by humans. 
Ruminants have a large sac-like structure called rumen between the oesophagus and the small intestine. The cellulose of the food is digested here by the action of certain bacteria which are not present in humans.

Sun’s light reaches to earth surface through
  • a)
    Radio wave
  • b)
    Conduction
  • c)
    Convection
  • d)
    Radiation
Correct answer is option 'D'. Can you explain this answer?

Varun Kapoor answered
Sunlight is a portion of the electromagnetic radiation given off by the Sun, in particular infrared, visible, and ultraviolet light. On Earth, sunlight is filtered through Earth's atmosphere, and is obvious as daylight when the Sun is above the horizon. When the direct solar radiation is not blocked by clouds, it is experienced as sunshine, a combination of bright light and radiant heat. When it is blocked by clouds or reflects off other objects, it is experienced as diffused light.|The sun's light takes about 8 minutes to reach the Earth after it has been emitted from the sun's surface. The time it takes for light to reach planets in our Solar System (not the Milky Way, which is our galaxy) varies from about 3 minutes for Mercury, to about 5.3 hours for Pluto.

One gram of ice is mixed with one gram of steam. At thermal equilibrium the temperature of mixture is
  • a)
    0°C
  • b)
    50°C
  • c)
    80°C
  • d)
    100°C
Correct answer is option 'D'. Can you explain this answer?

Kavya Yadav answered
Heat required melting 1g of ice at 0 degree to water at 0 degree = 80 cal
Heat required to raise the temperature of 1 g of water from 0 degree to 100 degree = 1 x 1 x 100 =100cal
Total heat required for maximum temperature of 100 = 180 cal
1 g of steam gives 540 cal so the temperature of mixture will be 100 degrees.

The excess of water absorbed plants by their roots gets evaporated through the process of
  • a)
    Absorption
  • b)
    Elimination
  • c)
    Transpiration
  • d)
    Excretion
Correct answer is option 'C'. Can you explain this answer?

Prisha Mehta answered
Plants lose gallons of water every day through the process of transpiration, the evaporation of water from plants primarily through pores in their leaves. Up to 99% of the water absorbed by roots is lost via transpiration through plant leaves.

Mode of nutrition in amoeba is
  • a)
    Herbivores
  • b)
    Holozoic
  • c)
    Omnivores
  • d)
    Autotrophic
Correct answer is option 'B'. Can you explain this answer?

Anmol Iyer answered
Nutrition in amoeba is holozoic. Thus, solid food particles are ingested which are then acted upon by enzymes and digested. It is an omnivore, feeding on both plants and animals. Its diet includes bacteria, microscopic plants like the diatoms, minute algae, microscopic animals like other protozoa, nematodes and even dead organic matter.

Absorption of water in alimentary canal takes place in
  • a)
    Small intestine 
  • b)
    Large intestine
  • c)
    Rectum
  • d)
    Stomach
Correct answer is option 'B'. Can you explain this answer?

Pooja Banerjee answered
Absorption of water in alimentary canal takes place in the Large intestine.
The process of absorption refers to the movement of water, nutrients, and other substances from the digestive system into the bloodstream. In the case of water absorption, it plays a crucial role in maintaining the body's fluid balance and preventing dehydration. The absorption of water in the alimentary canal specifically occurs in the large intestine.
Here is a detailed explanation of water absorption in the large intestine:
Anatomy of the Large Intestine:
- The large intestine is the final section of the digestive tract, following the small intestine.
- It is a wider and shorter tube that measures about 1.5 meters in length.
- The major parts of the large intestine include the cecum, colon, rectum, and anal canal.
Process of Water Absorption in the Large Intestine:
1. Residue from the small intestine enters the large intestine through the ileocecal valve.
2. In the large intestine, the residue passes through the ascending colon, transverse colon, descending colon, sigmoid colon, and finally reaches the rectum.
3. The large intestine mainly functions to reabsorb water and electrolytes from this residue before it is eliminated as feces.
4. The walls of the large intestine are lined with specialized cells called colonocytes that facilitate water absorption.
5. The colonocytes actively transport sodium ions out of the lumen of the large intestine and into the interstitial fluid.
6. The movement of sodium ions creates an osmotic gradient, causing water to follow passively through osmosis.
7. As a result, water is absorbed from the residue and into the bloodstream, helping to maintain the body's hydration levels.
8. The remaining residue, which is now more solid, continues to move through the large intestine and eventually reaches the rectum for elimination.

Significance of Water Absorption in the Large Intestine:
- The large intestine plays a crucial role in maintaining water balance in the body.
- It helps prevent dehydration by reabsorbing water from the residue, which would otherwise be lost as feces.
- The absorbed water is then transported to the bloodstream, where it can be distributed to various parts of the body.
- Adequate water absorption in the large intestine is essential for maintaining normal bowel movements and preventing constipation.
In conclusion, the absorption of water in the alimentary canal takes place in the large intestine. The walls of the large intestine, particularly the colonocytes, actively transport sodium ions, creating an osmotic gradient that facilitates water absorption through osmosis. This process helps maintain the body's fluid balance and prevents dehydration.

Land breeze blows from
  • a)
    Upper surface to surface layer
  • b)
    Lower surface to upper surface
  • c)
    Land to sea
  • d)
    Sea to land
Correct answer is option 'C'. Can you explain this answer?

Maitri Sarkar answered
The breeze that blows from the land toward the sea after sunset. The land cools more quickly than the ocean, cooling the air above it. The warmer air above the water continues to rise, and cooler air from over the land replaces it, creating a breeze.

Small intestine contain small finger-like projections to absorb digested food is called
  • a)
    Pseudopodia
  • b)
    Cilia
  • c)
    Villi
  • d)
    Flagella
Correct answer is option 'C'. Can you explain this answer?

Madhurima Kulkarni answered
The mucosa is a mucous membrane. It is the innermost lining of the small intestine. It is made up of a:
  • the layer of epithelial cells (called the epithelium)
  • a layer of loose connective tissue (called the lamina propria)
  • the very thin layer of muscle (called the muscularis mucosa)
 
The inner surface of the mucosa has many finger-like projections called villi. The villi increase the surface area of the small intestine, which helps it absorb digested food.

Bile juice is stored in
  • a)
    Stomach
  • b)
    Gall bladder
  • c)
    Liver
  • d)
    Urinary bladder
Correct answer is option 'B'. Can you explain this answer?

Divya Joshi answered
Bile salts are one of the primary components of bile. Bile is a greenish-yellow fluid made by the liver and stored in our gallbladder.

Which of the following component of food do not provide energy of body building?
  • a)
    Roughage
  • b)
    Proteins
  • c)
    Carbohydrates
  • d)
    Fats
Correct answer is option 'A'. Can you explain this answer?

Nandini Sengupta answered
Roughage is a component of food which do not provides energy or help in body building. Roughage helps in movement of food in alimentary canal.

Why do we feel more comfortable wearing light-colored clothes in the summer?
  • a)
    Because dark-colored clothes reflect most of the heat
  • b)
    Because dark-colored clothes absorb more heat
  • c)
    Because light-colored clothes trap heat better
  • d)
    Because light-colored clothes absorb more heat
Correct answer is option 'B'. Can you explain this answer?

Bespoke Classes answered
In the summer, we feel more comfortable wearing light-colored clothes because they reflect most of the heat that falls on them. This keeps us cooler compared to dark-colored clothes, which absorb more heat. So, when it's hot outside, light-colored clothes help us stay cool!

Which of the following is a reversible change?
  • a)
    Melting of ice
  • b)
    Germination of seed
  • c)
    Burning of matchstick
  • d)
    Changing of milk into curd
Correct answer is option 'A'. Can you explain this answer?

Varun Kapoor answered
Melting of ice is a reversible change while burning of matchstick, changing of milk into curd and germination of seed is chemical change.

Bile is secreted from
  • a)
    Pancreas
  • b)
    Small intestine
  • c)
    Stomach
  • d)
    Liver
Correct answer is option 'D'. Can you explain this answer?

Ananya Das answered
Bile is secreted from liver that contain bile salt. Bile salt helps in emulsification of fat.

In amoeba, digestion of food takes place inside
  • a)
    Food pipe
  • b)
    Gizzard
  • c)
    Food vacuole
  • d)
    Stomach
Correct answer is option 'C'. Can you explain this answer?

Geetika Shah answered
The mode of nutrition in amoeba is holozoic. Amoeba digests the food inside food vacuole that contain enzyme for digestion.

What are plants that depend on other plants for food called?
  • a)
    Autotrophs
  • b)
    none
  • c)
    Saprotrophs
  • d)
    Parasites
Correct answer is option 'D'. Can you explain this answer?

Tutorpedia Coaching answered
Plants that depend on other plants for food are called parasites. They extract nutrients from their host plant, often harming it in the process.

Water is a/an
  • a)
    Element
  • b)
    Mixture
  • c)
    Solution
  • d)
    Compound
Correct answer is option 'D'. Can you explain this answer?

Anand Iyer answered
Water is a compound as it contains hydrogen and oxygen in fixed ration by mass.

Rainwater harvesting is a method of
  • a)
    Water Conversation
  • b)
    Producing water for future use
  • c)
    Using rain water for daily purpose
  • d)
    All of these
Correct answer is option 'A'. Can you explain this answer?

Pragati Choudhary answered
Rain water harvesting is a method of water conservation by collection of rainwater mostly from the roof into a tank. It can then be used for multiple purposes. If untreated it can be used for watering the plants, washing the livestock etc. If treated properly it can be used for domestic purposes and even for drinking. One important application of collected rain water is to recharge the ground water.

Chapter doubts & questions for Class 7 Science - NCERT Textbooks (Class 6 to Class 12) 2025 is part of CTET & State TET exam preparation. The chapters have been prepared according to the CTET & State TET exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for CTET & State TET 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.

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