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All questions of Class 10 Biology for CTET & State TET Exam

Which of the following is biodegradable?
  • a)
    Plastic mugs
  • b)
    Leather belts
  • c)
    Silver foil
  • d)
    Iron nails
Correct answer is option 'B'. Can you explain this answer?

Raghav Bansal answered
Leather belts are biodegradable whereas silver foils, plastic mugs and iron nails are non - biodegradable. It takes leather between 25-50 years to completely decompose.
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A human zygote has :-
  • a)
    46 chromosomes
  • b)
    23 chromosomes
  • c)
    47 chromosomes
  • d)
    48 chromosome
Correct answer is option 'A'. Can you explain this answer?

Anoushka Nambiar answered
The cells from each parent that combine to form the zygote are called gametes. In humans, the male gamete is called sperm, and the female gamete is called an egg. When the gametes join they form a cell called a zygote. Human sperm and eggs contain 23 chromosomes. Human zygotes contain 46 chromosomes.

Practice Quiz or MCQ (Multiple Choice Questions) with Solutions of Chapter "Respiration (Life Processes)" are available for CBSE Class 10 Science and have been compiled as per the syllabus of CBSE Class 10 Science
 
Q. Vocal cards occur in –
  • a)
    Pharynx
  • b)
    Larynx
  • c)
    Glottis
  • d)
    Bronchial tube
Correct answer is option 'B'. Can you explain this answer?

Anjana Khatri answered
The vocal folds, also known commonly as vocal cords or voice reeds, are composed of twin infoldings of mucous membrane stretched horizontally, from back to front, across the larynx. They vibrate, modulating the flow of air being expelled from the lungs during phonation.

Which of the following groups does not contain only biodegradable items ?
  • a)
    Grass, flowers and leather
  • b)
    Grass, wood and plastic
  • c)
    Fruit-peels, cake and lime juice
  • d)
    Cake, wood and grass
Correct answer is option 'B'. Can you explain this answer?

Amit Kumar answered
Correct Answer :- b
Explanation : A Non-Biodegradable material can be defined as a kind of substance which cannot be broken down by natural organisms and acts as a source of pollution. ... Non-biodegradable wastes are those who cannot be decomposed or dissolved by natural agents.
Plastic is a non-biodegradable substance.

Can you explain the answer of this question below:

Haemoglobin is –

  • A:

    Vitamin

  • B:

    Skin pigment

  • C:

    Blood carrier

  • D:

    Respiratory pigment

The answer is D.

Krishna Iyer answered
the hemoglobin increases the oxygen carrying capacity of blood. In humans and most other vertebrates, the most common respiratory pigment is a protein called hemoglobin.

Which of the following is non-biodegradable?
  • a)
    Wool
  • b)
    Nylon
  • c)
    Animal bones
  • d)
    Tea leaves
Correct answer is option 'B'. Can you explain this answer?

Srishti Singh answered
Nylon plastic is the name for a long-chain, fiber forming polyamides, composing one of the largest groups of synthetic polymers. These chains are naturally very resistant to wear and tear, temperature and chemicals.so its non biodegradable.

How many lobes are present in cerebellum :-
  • a)
    1
  • b)
    3
  • c)
    5
  • d)
    7
Correct answer is option 'B'. Can you explain this answer?

Pooja Shah answered
Anatomical Lobes
There are three anatomical lobes that can be distinguished in the cerebellum; the anterior lobe, the posterior lobe and the flocculonodular lobe. These lobes are divided by two fissures – the primary fissure and posterolateral fissure.

Who introduced the idea of a spontaneous generation ?
  • a)
    Aristotle
  • b)
    Empedocles
  • c)
    Anaximus
  • d)
    Aristotle
Correct answer is option 'A'. Can you explain this answer?

Krishna Iyer answered
The doctrine of spontaneous generation was coherently synthesized by Aristotle, who compiled and expanded the work of earlier natural philosophers and the various ancient explanations for the appearance of organisms, and was taken as scientific fact for two millennia.

Puberty age in girls is between :-
  • a)
    12–18 years of age
  • b)
    10–16 years of age
  • c)
    14–20 years of age
  • d)
    15–18 years of age
Correct answer is option 'B'. Can you explain this answer?

Poorvi.m. Singh answered
Option b is correct because girls attain sexual mechurity and the menstrual cycle /menarch start in this phase,,due to adolescence

Oxygen is carried by :-
  • a)
    Leucocytes
  • b)
    Erythrocytes
  • c)
    Platelets
  • d)
    None of these
Correct answer is option 'B'. Can you explain this answer?

Pooja Shah answered
The oxygen carried by the erythrocytes can diffuse into the plasma and then through the capillary walls to reach the cells, whereas some of the carbon dioxide produced by the cells as a waste product diffuses into the capillaries to be picked up by the erythrocytes.

Chipko movement was started in
  • a)
    Uttarakhand
  • b)
    Himachal Pradesh
  • c)
    Uttar Pradesh
  • d)
    Madhya Pradesh
Correct answer is option 'A'. Can you explain this answer?

Amit Sharma answered
In the 1970s, The Chipko movement was taken place in the northern Himalayan segment of Uttar Pradesh. Where it started, that well-known area names as Uttarakhand. The word “Chipko” means that “to stick” or “to hug”.

Can you explain the answer of this question below:

The maximum affinity of haemoglobin is with –

  • A:

    Carbon monoxide

  • B:

    Carbondioxide

  • C:

    Oxygen

  • D:

    Ammonia

The answer is A.

Naina Sharma answered
Hemoglobin in humans has a very high affinity for carbon monoxide, forming carboxyhemoglobin which is a very bright red in color. Carbon monoxide is thus problematic for humans because it has affinity higher than that of oxygen.

Copulation in human beings may result in fertilisation during (normal menstrual cycle is for 28 days)
  • a)
    4th day and 10th day
  • b)
    21th day and 28th day
  • c)
    11th day and 21st day
  • d)
    any day between 1st day and 28th day
Correct answer is option 'C'. Can you explain this answer?

Amit Sharma answered
Because fertilization of egg starts in 11 to 21 th days after that the unfertilized egg will ready to come out due to which copulation results in fertilization between 11 to 21 th days. 

Epiglottis guards the opening of :-
  • a)
    Oesophagus
  • b)
    Eustachian tubes
  • c)
    Larynx
  • d)
    Internal nares
Correct answer is option 'C'. Can you explain this answer?

Sonam malhotra answered
The epiglottis is a flexible flap at the superior end of the larynx in the throat. It acts as a switch between the larynx and the esophagus to permit air to enter the airway to the lungs and food to pass into the gastrointestinal tract. The epiglottis also protects the body from choking on food that would normally obstruct the airway.

Trophic level in an ecosystem represents
  • a)
    oxygen level
  • b)
    water level
  • c)
    energy level
  • d)
    salt level
Correct answer is option 'C'. Can you explain this answer?

Amit Sharma answered
  • Organisms occupy a place in the natural surroundings or in a community according to their feeding relationship with other organisms.
  • Based on the source of their nutrition or food, organisms occupy a specific place in the food chain that is known as their trophic level.
  • Producers belong to the first trophic level, herbivores (primary consumer) to the second and carnivores (secondary consumer) to the third.
  • The amount of energy decreases at successive trophic levels
Hence, trophic levels represent energy level as well.

Which of the following can reproduce through regeneration ?
  • a)
    Hydra
  • b)
    Planaria
  • c)
    Wall lizard
  • d)
    Both (A) and (B)
Correct answer is option 'D'. Can you explain this answer?

Akshara Basu answered
In asexual reproduction, the planarian detaches its tail end and each half regrows the lost parts by regeneration, allowing neoblasts (adult stem cells) to divide and differentiate, thus resulting in two worms. and hydra is reproduce by budding.

Chemical transmission of nerve impulses from one neuron to another at a synapse is by :-
  • a)
    Cholesterol
  • b)
    Acetylcholine
  • c)
    Cholecystokinin
  • d)
    ATP
Correct answer is option 'B'. Can you explain this answer?

Krishna Iyer answered
The distal end of the axon terminals have swollen ends to form “ bulbs” which store chemicals called neurotransmitters. These are responsible for passing the impulse from one neuron to another or from a neuron to a tissue. (Acetylcholine is an important neurotransmitter.)

Which of the following is the conventional sources of energy
  • a)
    Geothermal energy, wind energy
  • b)
    Solar, wind energy
  • c)
    Biomass, Nuclear energy
  • d)
    None of these
Correct answer is option 'C'. Can you explain this answer?

Krishna Iyer answered
Biomass is another semi - conventional energy source because it is in the process of becoming mainstream. Biomass energy comes from plant material. Biomass can be used for heating and generating electricity. 
Nuclear energy is one of the most environmental friendly conventional  sources of energy as it produces fewer greenhouse gas emissions during the production of electricity.

Which of these is not a raw material for photosynthesis?
  • a)
     Carbon dioxide
  • b)
    Water
  • c)
    Oxygen
  • d)
    None of these
Correct answer is option 'C'. Can you explain this answer?

Krishna Iyer answered
organism prepare their own food with the help of simple inorganic materials like CO2,H2O in sunlight with the help of chlorophyll. Thus, it doesn’t involve oxygen in the process.

The primary reason for increase in human population is :-
  • a)
    the increase in agricultural production
  • b)
    the increase in birth rate and decrease in death rate
  • c)
    the improvement in medical technology
  • d)
    all of the above
Correct answer is option 'B'. Can you explain this answer?

Akshay Nair answered
The two reasons for the rapid increase in population in recent times are :
(i) The death rate in India has fallen down due to increased scientific and medical knowledge.
(ii) Improved standard of living due to increased food production and industrial development and education has brought about an increase in population.

Which hormones regulate calcium and phosphorus levels in the body :-
  • a)
    Calcitonin and parathormone
  • b)
    Insulin an gulcagon
  • c)
    Oxytocin and vasopessin
  • d)
    Thyroxine and thymosin
Correct answer is option 'A'. Can you explain this answer?

Ritika Choudhury answered
A hormone called parathyroid hormone regulates the levels of calcium and phosphorus in your blood. When the phosphorus level is measured, a vitamin D level, and sometimes a PTH level, is measured at the same time. Vitamin D is needed for your body to take in phosphate.

Which of the following constitute a food-chain ?
  • a)
    Grass, wheat and mango
  • b)
    Grass, goat and human
  • c)
    Goat, cow and elephant
  • d)
    Grass, fish and goat
Correct answer is option 'B'. Can you explain this answer?

Vivek Rana answered
Grass, goat and human constitute a food chain. Grass is an autotroph i.e. it produces its own food. Grass is eaten by goat which is a herbivore. Human beings are omnivores (they eat both meat and plant foods) so they eat meat of goat. Hence this is a food chain.

What causes the tendril of a pea plant to circle around an object it touches?
  • a)
    Rapid growth on the side touching the object
  • b)
    Inhibition of growth on the side touching the object
  • c)
    Electrical impulses
  • d)
    Hormonal secretions
Correct answer is option 'B'. Can you explain this answer?

Harshad Majumdar answered
  1. Tendrils are sensitive in nature.
  2. They mainly respond to touch by growing and winding around the object.
  3. The coiling mechanism occurs when the part of the tendril which touches the object stops growing.
  4. Thus, the remaining part grows faster because of the plant hormone auxin which cause the coiling effect.
  5. Auxin stimulates cell growth on the opposite side so that the coil forms rapidly.
  6. The coiled portion of the tendrils is later concentrated with sclerenchyma cells to provide rigidity.
  7. The twining tendency of the tendril causes it to encircle or coil around the object it comes in contact with.

In an ecosystem, herbivores represent
  • a)
    producers
  • b)
    primary consumers
  • c)
    secondary consumers
  • d)
    decomposers
Correct answer is option 'B'. Can you explain this answer?

Amit Sharma answered
A food chain is a linear sequence of organisms through which nutrients and energy pass as one organism eats another. 
(i)  At the base of the food chain lie the primary producers. The primary producers are autotrophs and are most often photosynthetic organisms such as plants, algae, or cyanobacteria.
(ii) Primary consumers are the organisms that eat the primary producers. They are usually herbivores, plant-eaters, though they may be algae eaters or bacteria eaters.
(iii) Secondary consumers are the organisms that eat the primary consumers. They are generally meat-eaters called carnivores.
(iv) Tertiary consumers are the organisms that eat the secondary consumers. These are carnivore-eating carnivores, like eagles or big fish.

The process of eating and being eaten is called-
  • a)
    Food chain
  • b)
    Food store
  • c)
    Food web
  • d)
    Food cycle
Correct answer is option 'C'. Can you explain this answer?

Amit Kumar answered
The food chain is a sequence of populations or organisms through which food and energy are passed on an ecosystem with the members of each trophic levels. A food chain shows who is eating whom. Here, organisms of higher trophic level derive its nutrients from organisms of a lower trophic level.

Which one of the following will undergo fastest bio-degradation?
  • a)
    Mango seed
  • b)
    Wood
  • c)
    Mango peel
  • d)
    Mango pulp
Correct answer is option 'D'. Can you explain this answer?

Gaurav Kumar answered
Mango pulp contains enzymes like polyphenol oxidase which results in its browning and later degrades it and it is mainly absent in other substances. 

Oxygen in lungs ultimately reaches –
  • a)
    Alveoli
  • b)
    Trachea
  • c)
    Bronchus
  • d)
    Bronchioles
Correct answer is option 'D'. Can you explain this answer?

Vikas Kumar answered
The answer is a.
The alveoli are the final branchings of the respiratory tree and act as the primary gas exchange units of the lung. Inhaled oxygen enters the lungs and reaches the alveoli. 

Cerebral hemispheres are the centres of :-
  • a)
    Balance
  • b)
    Smell
  • c)
    Taste
  • d)
    Thinking
Correct answer is option 'D'. Can you explain this answer?

Anmol tiwari answered
The correct answer is option 'D', which states that cerebral hemispheres are the centers of thinking. Let's delve into the details to understand why this is the correct answer.

The cerebral hemispheres, also known as the cerebrum, are the largest part of the brain and are responsible for various higher cognitive functions, including thinking, reasoning, problem-solving, and decision-making. They are divided into two halves: the left hemisphere and the right hemisphere. Each hemisphere controls the opposite side of the body.

Thinking Process:
- The cerebral hemispheres play a crucial role in the thinking process. They receive and process information from various sensory organs, enabling us to perceive the world around us. This information is then analyzed, synthesized, and interpreted to form thoughts and ideas.
- The left hemisphere is primarily responsible for logical and analytical thinking. It deals with language, mathematics, and problem-solving. It helps us in reasoning, planning, and making rational decisions.
- The right hemisphere, on the other hand, is associated with creative and intuitive thinking. It is responsible for artistic abilities, imagination, and recognizing patterns. It helps us in understanding emotions, visualizing objects and scenarios, and expressing ourselves creatively.
- The two hemispheres work together in a coordinated manner, allowing us to think critically, creatively, and holistically.

Other Functions:
While the cerebral hemispheres are primarily associated with thinking, it is important to note that they are also involved in other functions. Some of these functions include:

1. Perception and Sensation: The cerebral hemispheres receive and process sensory information, allowing us to perceive the world through our senses. They interpret signals from the eyes, ears, skin, and other sensory organs, enabling us to see, hear, touch, taste, and smell.

2. Motor Control: The cerebral hemispheres are involved in controlling voluntary movements. They send signals to the muscles, enabling us to perform various actions like walking, talking, writing, and playing instruments.

3. Memory and Learning: The cerebral hemispheres play a crucial role in memory formation and learning. They help in storing information and retrieving it when needed. Different areas within the hemispheres are responsible for different types of memory, such as short-term memory and long-term memory.

4. Language Processing: While language processing is primarily associated with the left hemisphere, both hemispheres contribute to various aspects of language. The left hemisphere is responsible for language production and comprehension, while the right hemisphere assists in understanding non-literal language, gestures, and emotional aspects of communication.

In conclusion, the cerebral hemispheres are the centers of thinking. They are involved in various cognitive functions such as perception, sensation, motor control, memory, learning, and language processing. The left hemisphere is associated with logical thinking, while the right hemisphere is involved in creative thinking. The coordinated functioning of both hemispheres allows us to think critically, creatively, and holistically.

In a given food chain, suppose the amount of energy at fourth trophic level is 5 kJ, what will be the energy available at the producer level ?
Grass → Grasshopper → Frog → Snake → Hawk
  • a)
    5 kJ
  • b)
    50 kJ
  • c)
    500 kJ
  • d)
    5000 kJ
Correct answer is option 'D'. Can you explain this answer?

Surbhi Gupta answered
According to 10 percent law, 90% of the energy captured from the previous trophic level is lost to the environment and only 10 percent is made available to the next trophic level.

In this food chain, at the 4th trophic level, 5 kJ energy is available to the snake

⇒ Energy available to Frog = 10% of 50 kJ

⇒ Energy available to Grasshopper = 10% of 500 kJ

⇒ Energy available to Grass = 10% of 5000 kJ.

Which group of organisms are not constituents of a food chain?
(i) Grass, lion, rabbit, wolf
(ii) Plankton, man, fish, grasshopper
(iii) Wolf, grass, snake, tiger
(iv) Frog, snake, eagle, grass, grasshopper
  • a)
    (i) and (ii)
  • b)
    (iii) and (iv)
  • c)
    (ii) and (iii)
  • d)
    (i) and (iv)
Correct answer is option 'C'. Can you explain this answer?

Krishna Iyer answered
The organisms in an ecosystem are related through food requirements. This relationship is called food chain. In option (i) grass is eaten by rabbit, rabbit is consumed by wolf and lion eats wolf. In option (iv) grasshopper eats grass, frog eats grasshopper, snake eats frog and eagle consumes snake. In option (ii) grasshopper is found in terrestrial ecosystems not aquatic ecosystems. In option (iii) there is no herbivore animal to consume grass. Thus, the correct answer is option C.

The chart given here shows a cell division. The division is :- 
 
  • a)
    Mitosis
  • b)
    Meiosis
  • c)
    Division of a zygote during development
  • d)
    Division of an Amoeba during binary fission
Correct answer is option 'B'. Can you explain this answer?

Kuldeep Raj answered
Option (b) Meiosis is correct friend.

Because, the definition of the Meiosis states that Reproductive cells/ germ cells/ sex cells have half (Haploid) number of chromosomes and DNA compared to other non reproductive cells of body by special type of cell division called Meiosis. It helps to maintain same number of chromosomes in successive generation as like in parents.

Number of cranial nerves in human :-
  • a)
    12
  • b)
    24
  • c)
    11
  • d)
    29
Correct answer is option 'A'. Can you explain this answer?

Anjana Khatri answered
There are 12 pairs of Carnial nerves.
Cranial nerves are the nerves that emerge directly from the brain (including the brainstem), in contrast to spinal nerves (which emerge from segments of the spinal cord). 10 of 12 of the cranial nerves originate in the brainstem. Cranial nerves relay information between the brain and parts of the body, primarily to and from regions of the head and neck.

Chapter doubts & questions for Class 10 Biology - 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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