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All questions of Class 10 Biology for RRB Group D / RPF Constable Exam

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.
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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.

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.

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.

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.

The importance of reproduction in organisms is because of :-
  • a)
    Formation of new individuals
  • b)
    Production of individuals with same traits
  • c)
    Production of individuals with different traits so as to being varieties in a population
  • d)
    All of the above
Correct answer is option 'D'. Can you explain this answer?

Akshara Basu answered
Reproduction is an important characteristic feature of living organisms. It is an essential life process which not only helps in survival but also helps in continuity of that race and group immortality, as by reproduction. Young ones replace the old and dying ones. These young ones feed, grow and reproduce again.

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.

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.

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”.

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.)

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.

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.

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.

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

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.

‘There was no oxygen in our atmosphere earlier and it was added to the atmosphere later on’ the above statement is
  • a)
    false
  • b)
    True
  • c)
    Partially false
  • d)
    Partially true
Correct answer is option 'B'. Can you explain this answer?

Vivek Rana answered
Oxygen was first produced somewhere around 2.7 billion to 2.8 billion years ago.
It was produced by tiny organisms known as Cyanobacteria, or blue - green algae.

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 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.

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

Nk Classes answered
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. 

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.

As compared to human egg the spermatozoa has less :-
  • a)
    Chromosomes
  • b)
    Centrosomes
  • c)
    Cytoplasm
  • d)
    Mobility
Correct answer is option 'C'. Can you explain this answer?

Akshay Nair answered
Sperm cells are the smallest human cells. They are no more than a nucleus with a small amount of cytoplasm, some mitochondria (the energy suppliers of the cell) and a long tail. They have hardly any content and are the straightest cells.

Which of the following hormone known as anti-abortion hormone ?
  • a)
    Oxytocin
  • b)
    Estrogen
  • c)
    Progesterone
  • d)
    Testosterone
Correct answer is option 'C'. Can you explain this answer?

Vivek Rana answered
Progesterone is an anti abortion hormone. 
It is mainly secreted by the corpus luteum in the ovary during the second half of the menstrual cycle. It plays important roles in the menstrual cycle and in maintaining the early stages of pregnancy. Hence, progesterone is called as the " Anti-national abortion hormone ".

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

Amit Sharma answered
Cerebral is centre of thinking, will power, reasoning and memory, experience and learning knowledge and articulate speech.

“Nitrous oxide is a green house gas” the above statement is-
  • a)
    True
  • b)
    Partially false
  • c)
    Partially true
  • d)
    False
Correct answer is option 'A'. Can you explain this answer?

Amit Sharma answered
Like other greenhouse gases, nitrous oxide absorbs radiation and traps heat in the atmosphere, where it can live for an average of 114 years, according to the EPA.

Twins absolutely resembling each other in sex and external appearance result when :
  • a)
    Two similar sperms fertilise two similar eggs
  • b)
    Same sperm fertilises two eggs
  • c)
    Two halves of the same egg develop separately after it is fertilised by one sperm
  • d)
    Two halves of the same egg are fertilised by two separate sperms
Correct answer is option 'C'. Can you explain this answer?

Gaurav Kumar answered
Twins absolutely resembling each other in sex and external appearance are referred to as Identical Twins. Identical twins are formed when one egg after being fertilized by one sperm, divides into two halves. The two halves are genetically identical and of the same sex. Because these twins come from one zygote, they are also known as monozygotic.

The neurons that carry nerve impulse from spinal cord to effectors are called :-
  • a)
    Sensory neurons
  • b)
    Motor neurons
  • c)
    Interneurons
  • d)
    Spinal neurons
Correct answer is option 'B'. Can you explain this answer?

Krishna Iyer answered
Motor Neurons- Motor neurons carry impulses from the CNS to effector organs Motor neurons are also called efferent neurons. The cell bodies of motor neurons are inside the CNS.

Name the hormone which controls basal metabolic rate in animals :-
  • a)
    Adrenaline
  • b)
    Thymosin
  • c)
    Oxytocin
  • d)
    Thyroxine
Correct answer is option 'D'. Can you explain this answer?

Pooja Shah answered
The basal metabolic rate, which is the amount of calories required by the body at rest, is determined by two hormones produced by the thyroid gland :- thyroxine. 

The narrowest and most numberous tubes of lungs are termed as –
  • a)
    Bronchus
  • b)
    Bronchioles
  • c)
    Alveoli
  • d)
    None of these
Correct answer is option 'B'. Can you explain this answer?

Vikas Kumar answered
Bronchiole is a fine respiratory tube in the lungs of reptiles, birds and mammals. It is formed by the subdivision of a bronchus. 

Plant can respire in :
  • a)
    Dark
  • b)
    Light
  • c)
    Both in light and dark
  • d)
    Morning
Correct answer is option 'C'. Can you explain this answer?

Arun Sharma answered
Respiration is constitutive process that occurs in all tissues. Unlike photosynthesis that can happen only in the presence of sunlight, respiration in plant occurs all time. So, the answer is - both light and dark.

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.

Khadin system of water harvesting is found in
  • a)
    Rajasthan
  • b)
    Himachal Pradesh
  • c)
    Haryana
  • d)
    Gujarat
Correct answer is option 'A'. Can you explain this answer?

Swara Chopra answered
The 'Khadin' system of rainwater harvesting was practiced in ancient times in Rajasthan. In this system, a very long (about 100 m - 300 m long) earthen embankment called 'Bund' is built across the lower hill slopes lying below gravelly uplands. The rainwater from the catchment area is made to flow down the slopes and stopped by the 'Bund' to form a reservoir. The rainwater collected in the reservoir formed by the 'Bund', and in the well, gradually penetrates into the land (or ground). This water - saturated land is subsequently used for growing crops. In this way, rain water harvesting was done using khadin system in Rajasthan.

Breathing is controlled by a centre in the
  • a)
    Lungs
  • b)
    Heart
  • c)
    Cerebellum
  • d)
    Medulla oblongata
Correct answer is option 'D'. Can you explain this answer?

Rahul Kapoor answered
The respiratory centers (RCs) are located in the medulla oblongata and pons, which are parts of the brainstem. The RCs receive controlling signals of neural, chemical and hormonal nature and 
control the rate and depth of respiratory movements of the diaphragm and other respiratory muscles.

The cerebellum is concerned with :-
  • a)
    Preception
  • b)
    Vision
  • c)
    Coordinate and movement
  • d)
    Memory
Correct answer is option 'C'. Can you explain this answer?

Ananya Das answered
The cerebellum is located behind the brain stem. While the frontal lobe controls movement, the cerebellum " fine - tunes " this movement. This area of the brain is responsible for fine motor movement, balance and thr brain's ability to determine limb position.

Carbon monoxide has greater affinity for haemoglobin as compared to oxygen by
  • a)
    1000 times
  • b)
    200 times
  • c)
    20 times
  • d)
    2 times
Correct answer is 'B'. Can you explain this answer?

Ananya Das answered
Carbon monoxide binds very strongly to the iron atoms in hemoglobin, the principal oxygen-carrying compound in blood. The affinity between CO and hemoglobin is 200 times stronger than the affinity between hemoglobin and oxygen. When CO binds to the hemoglobin it cannot be released nearly as readily as oxygen would be. The preferential binding of carbon monoxide to heme iron is the main reason for carbon monoxide poisoning. 

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.

Hyposecretion of thyroxine in children causes :-
  • a)
    Dwarfism
  • b)
    Gigantism
  • c)
    Acromegly
  • d)
    Cretinism
Correct answer is option 'D'. Can you explain this answer?

Vikas Kumar answered
Cretinism is a condition of severely stunted physical and mental growth owing to untreated congenital deficiency of thyroid hormone (congenital hypothyroidism) usually owing to maternal hypothyroidism.

MCQ (Multiple Choice Questions) or Practice Quiz with solutions of Chapter - "Control and Coordination" of Class 10 Science, the questions are available for practice
 
Q. Which one of the endocrine glands is known as master gland ?
  • a)
    Pituitary
  • b)
    Adrenal
  • c)
    Thyroid
  • d)
    Parathyroid
Correct answer is 'A'. Can you explain this answer?

Animesh prakash answered
Pituitary gland as the master gland

The pituitary gland is called the "master gland" because it controls the functions of other endocrine glands in the body. It is a small gland located at the base of the brain and is connected to the hypothalamus by a stalk-like structure called the infundibulum.

Functions of the pituitary gland

The pituitary gland secretes hormones that regulate many bodily functions, including growth and development, reproduction, metabolism, and water balance. It is divided into two parts: the anterior pituitary and the posterior pituitary.

Anterior pituitary hormones

The anterior pituitary produces and secretes several hormones, including:

1. Growth hormone (GH): promotes growth and development of bone, muscle, and other tissues.

2. Prolactin (PRL): stimulates milk production in the mammary glands.

3. Follicle-stimulating hormone (FSH): stimulates the growth and development of ovarian follicles in females and the production of sperm in males.

4. Luteinizing hormone (LH): stimulates ovulation in females and the production of testosterone in males.

5. Adrenocorticotropic hormone (ACTH): stimulates the production of cortisol by the adrenal glands.

6. Thyroid-stimulating hormone (TSH): stimulates the production of thyroid hormones by the thyroid gland.

Posterior pituitary hormones

The posterior pituitary stores and releases two hormones produced by the hypothalamus:

1. Oxytocin: stimulates uterine contractions during childbirth and milk ejection during breastfeeding.

2. Antidiuretic hormone (ADH): regulates water balance by increasing water reabsorption in the kidneys.

Conclusion

In summary, the pituitary gland is called the "master gland" because it controls the functions of other endocrine glands in the body. It secretes hormones that regulate many bodily functions, including growth and development, reproduction, metabolism, and water balance. The anterior pituitary produces and secretes several hormones, while the posterior pituitary stores and releases two hormones produced by the hypothalamus.

The term 'hormone' was coined by :-
  • a)
    Yabuta
  • b)
    Went
  • c)
    Starling
  • d)
    Wilson
Correct answer is option 'C'. Can you explain this answer?

Amit Sharma answered
Hormone, secretin: Hormone made by glands in the small intestine that stimulates pancreatic secretion. The word "hormone" was coined by the English physiologists Wm. M. Bayliss and Ernest H. Starling in connection with their discovery of secretin, the first hormone, in 1902.

Reproduction by budding takes place in :-
  • a)
    Hydra and Earthworm
  • b)
    Hydra and Yeast
  • c)
    Yeast and Bacteria
  • d)
    Bacteria and Amoeba
Correct answer is option 'B'. Can you explain this answer?

Sagarika Nair answered
Budding is an asexual mode of producing new organisms. In this process, a new organism is developed from a small part of the parent’s body. A bud which is formed detaches to develop into a new organism. The newly developed organism remains attached as it grows further. It is separated from the parent organism when it gets matured by leaving scar tissues behind. As this is an asexual reproduction, the newly developed organism is a replica of the parent and is genetically identical.
For reproduction, Hydra uses regenerative cells where a bud expands as an outgrowth because of repeated cell division at one specific location. These buds then developed into new small individuals which when completely matured, detach from the parent body.
For example- Both hydra and yeast reproduce by the process of Budding.

Which of the following tests is for determining, the sex of the foetus ?
  • a)
    Blood group test
  • b)
    Amniocentesis
  • c)
    Blood sugar test
  • d)
    pH value test
Correct answer is option 'B'. Can you explain this answer?

Arun Sharma answered
Amniocentesis is a medical procedure used primarily in prenatal diagnosis of chromosomal abnormalities and the fetal infections as well as for sex determination. 

Chapter doubts & questions for Class 10 Biology - General Science for Competitive Exams 2025 is part of RRB Group D / RPF Constable exam preparation. The chapters have been prepared according to the RRB Group D / RPF Constable exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for RRB Group D / RPF Constable 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.

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