Class 10 ICSE Biology Answer Key 2025 (OUT) Live Updates: Unofficial key PDF download

For the exam on March 24, Class 10 ICSE Biology Answer Key 2025 for all short-answer questions is provided here. ICSE Biology 2025 was held on March 24.

Class 10 ICSE Biology Answer Key 2025

Class 10 ICSE Biology Answer Key 2025 : Candidates can anticipate their performance in the ICSE Class 10 Biology Examination 2025, which was held on March 24, 2025. To make this easier, several respectable tutoring centres and subject matter specialists are making unofficial answer keys accessible for download in PDF format. These are arranged according to question paper sets. Section A and Section B are the two conventional divisions of the exam paper. The unofficial answer keys for these parts have been released following the exam, giving applicants a head start on assessing their performance. Candidates can estimate their scores before the official result announcement thanks to these, which are developed by CollegeDekho's renowned topic specialists.

Also Read | Class 10 ICSE Result Expected Release Date 2025

Class 10 ICSE Biology Answer Key 2025

Aspirants can check the unofficial answer key for the ICSE Class 10 Biology 2025 exam in the table below.

Section A Question 1

Q. No.	Answers
Q1 (i) The number of live births per thousand people per year is called:	Natality
Q1 (ii) The structure that lies at the junction of the choroid and the iris and is itself a part of the choroid is called:	Ciliary Body
Q1 (iii) Assertion (A): Seminal vesicles pour an alkaline secretion into the semen as it passes through the ureter. Reason (R): The female vagina is acidic and needs to be neutralized for sperm survival.	(A) is false and (R) is true
Q1 (iv) The hormone that induces vigorous contractions of the uterus in a pregnant mother is:	Oxytocin
Q1 (v) A scientist wanted to conduct a genetic experiment on mice. He cut the tails of all the mice and made them reproduce. What will be the phenotype of the offsprings?	All the offsprings will have tails.
Q1 (vi) Assertion (A): A turgid plant cell is in a balanced state. Reason (R): In a turgid cell, turgor pressure and wall pressure are equal and in the same direction.	Both (A) and (R) are true.
Q1 (vii) The optimum temperature for photosynthesis is:	25 - 35 ^o C
Q1 (viii) Ajay and Vijay are siblings. Ajay can roll his tongue while Vijay cannot. What is the genotype of their parents?	Both the parents are heterozygous dominant.
Q1 (ix) Assertion (A): Deficiency of Antidiuretic hormone causes an increase in urination. Reason (R): Antidiuretic hormone acts on the kidney to reabsorb water from the kidney tubules.	Both (A) and (R) are true.
Q1 (x) A phase of cell division where the spindle fibres disappear is:	Telophase
Q1 (xi) Assertion (A): Arachnoid layer helps in speeding up the transmission of nerve impulses along the axons. Reason (R): Axon endings at the synapse secrete acetylene.	(A) is false but (R) is true.
Q1 (xii) Many nuclear power plants are constructed near water sources. They use water for cooling their machinery and release it back into the water stream. Identify the kind of pollution caused.	Thermal Pollution
Q1 (xiii) Owls are nocturnal animals. They are active at night and hunt small animals for food. Owls have large eyes and can see well at night. This is due to:	Rods and Rhodopsin
Q1 (xiv) Sunil tried to match the tropic movements in plants with the stimulus they respond to. The tabulation is given below: Identify the correct pair:	P and R
Q1 (xv) Observe the following picture and identify the defect and the cause of the defect.	Ex-ophthalmic goitre, over secretion of thyroxine.

Section A Question 2

Q. No.	Answers
Q2 (I) (a) The fully developed part of the ovary containing a mature ovum.	Graphian follicle
Q2 (I) (b) A waxy layer on the upper epidermis of leaves meant to reduce Transpiration.	Cuticle
Q2 (I) (c) The ear ossicle which opens into the oval window of Cochlea.	Stapes
Q2 (I) (d) The physiological process which is the starting point of all food chains.	Photosynthesis
Q2 (I) (e) An insect which is a classic example of natural selection due to industrial melanism.	Peppered moth
Q2 (II) The heart is enclosed by a membrane called (a) _______. The ventricles give rise to two large blood vessels called (b) _____ and (c) ______. The flaps of the cuspid valves are kept in position by (d) ________. (e) _______ arteries supply oxygenated blood to the walls of the heart.	(a) Pericardium (b) Aorta (c) Pulmonary artery (d) Chordae tendineae (e) Coronary arteries
Q2 (III) (a) Arrange the terms in each group in the correct order. Write them in a logical sequence beginning with the term that is underlined. Palisade cells, Cuticle , Upper epidermis, Spongy cells.	Cuticle, Upper epidermis, Palisade cells, Spongy cells
Q2 (III) (b) Hepatic portal vein, Stomach, Hepatic vein, Liver.	Stomach, Hepatic portal vein, Liver, Hepatic vein
Q2 (III) (c) Cyton, Dendrites , Synaptic cleft, Axon endings.	Dendrites, Cyton, Axon endings, Synaptic cleft
Q2 (III) (d) Insulin release, High blood sugar , Lowers blood sugar, Stimulates glucose uptake from blood.	High blood sugar, Insulin release, Stimulates glucose uptake from blood, Lowers blood sugar
Q2 (III) (e) Sperm duct, Seminiferous tubule , Epididymis, Efferent ducts.	Seminiferous tubule, Efferent ducts, Epididymis, Sperm duct
Q2 (IV) (a) The canal through which the testes descend down into the scrotum just before the birth of a male baby.	Inguinal canal
Q2 (IV) (b) The part of the brain that regulates the peristaltic movement of the alimentary canal.	Medulla oblongata
Q2 (IV) (c) A structure that collects the sound waves and conducts them through the external auditory canal.	Pinna
Q2 (IV) (d) The point of attachment of two chromatids of a chromosome.	Centromere
Q2 (IV) (e) Regulation of the opening and closing of stomata.	Guard cells

Class 10 ICSE Biology Exam Analysis 2025 Link

Candidates can check out the ICSE 10th Biology Exam Analysis 2025 by clicking the link below.

Class 10 ICSE Biology Exam Analysis 2025

Class 10 ICSE Subject-Wise Answer Key 2025 |

Subject	Answer Key Link
English Language	Class 10 ICSE English Language Answer Key 2025
English Literature	Class 10 ICSE English Literature Answer Key 2025
Economics	Class 10 ICSE Economics Answer Key 2025
Mathematics	Class 10 ICSE Mathematics Answer Key 2025
Hindi	Class 10 ICSE Hindi Answer Key 2025
History & Civics	Class 10 ICSE History & Civics Answer Key 2025
Geography	Class 10 ICSE Geography Answer Key 2025
Physics	Class 10 ICSE Physics Answer Key 2025
Chemistry	Class 10 ICSE Chemistry Answer Key 2025

Students should stay tuned to live updates for the latest information on expert analysis, difficulty level, and real-time updates.

Class 10 ICSE Biology Answer Key 2025 Live Updates

08 00 PM IST - 24 Mar'25
ICSE 10th Biology Answer Key 2025: Questions with Solutions
Aspirants can check the questions with solutions below as per the ICSE Class 10 Biology Answer Key 2025.
Question: The heart is enclosed by a membrane called (a) _______. The ventricles give rise to two large blood vessels called (b) _____ and (c) ______. The flaps of the cuspid valves are kept in position by (d) ________. (e) _______ arteries supply oxygenated blood to the walls of the heart.
Answer: (a) Pericardium
(b) Aorta
(c) Pulmonary artery
(d) Chordae tendineae
(e) Coronary arteries
07 40 PM IST - 24 Mar'25
Class 10 ICSE Biology Answer Key 2025: Questions with Solutions
Aspirants can check the questions with solutions below as per the ICSE Class 10 Biology Answer Key 2025.
Question: A waxy layer on the upper epidermis of leaves meant to reduce Transpiration.
Answer: Cuticle
07 20 PM IST - 24 Mar'25
ICSE Class 10 Biology Unofficial Answer Key 2025: Questions with Solutions
Aspirants can check the questions with solutions below as per the ICSE Class 10 Biology Answer Key 2025.
Question: The fully developed part of the ovary containing a mature ovum.
Answer: Graphian follicle
07 00 PM IST - 24 Mar'25
ICSE Class 10 Biology Answer Key 2025 Live: Questions with Solutions
Aspirants can check the questions with solutions below as per the ICSE Class 10 Biology Answer Key 2025.
Question: Observe the following picture and identify the defect and the cause of the defect.
Answer: Ex-ophthalmic goitre, over secretion of thyroxine.
06 40 PM IST - 24 Mar'25
ICSE 10th Biology Answer Key 2025: Questions with Solutions
Aspirants can check the questions with solutions below as per the ICSE Class 10 Biology Answer Key 2025.
Question: Sunil tried to match the tropic movements in plants with the stimulus they respond to. The tabulation is given below:
Answer: P and R
06 20 PM IST - 24 Mar'25
ICSE Class 10 Biology Answer Key 2025 Live: Questions with Solutions
Aspirants can check the questions with solutions below as per the ICSE Class 10 Biology Answer Key 2025.
Question: Owls are nocturnal animals. They are active at night and hunt small animals for food. Owls have large eyes and can see well at night. This is due to:
Answer: Rods and Rhodopsin
06 00 PM IST - 24 Mar'25
ICSE 10th Biology Unofficial Answer Key 2025: Questions with Solutions
Aspirants can check the questions with solutions below as per the ICSE Class 10 Biology Answer Key 2025.
Question: Many nuclear power plants are constructed near water sources. They use water for cooling their machinery and release it back into the water stream. Identify the kind of pollution caused.
Answer: Thermal Pollution
05 40 PM IST - 24 Mar'25
Class 10 ICSE Biology Answer Key 2025: Questions with Solutions
Aspirants can check the questions with solutions below as per the ICSE Class 10 Biology Answer Key 2025.
Question: Assertion (A): Arachnoid layer helps in speeding up the transmission of nerve impulses along the axons.
Reason (R): Axon endings at the synapse secrete acetylene.
Answer: (A) is false but (R) is true.
05 20 PM IST - 24 Mar'25
ICSE Class 10th Biology Answer Key 2025: Questions with Solutions
Aspirants can check the questions with solutions below as per the ICSE Class 10 Biology Answer Key 2025.
Question: A phase of cell division where the spindle fibres disappear is:
Answer: Telophase
05 00 PM IST - 24 Mar'25
Class 10 ICSE Biology Answer Key 2025: Questions with Solutions
Aspirants can check the questions with solutions below as per the ICSE Class 10 Biology Answer Key 2025.
Question: Assertion (A): Deficiency of Antidiuretic hormone causes an increase in urination.
Reason (R): Antidiuretic hormone acts on the kidney to reabsorb water from the kidney tubules.
Answer: Both (A) and (R) are true.
04 40 PM IST - 24 Mar'25
ICSE Class 10 Biology 2025 Answer Key: Questions with Solutions
Aspirants can check the questions with solutions below as per the ICSE Class 10 Biology Answer Key 2025.
Question: Ajay and Vijay are siblings. Ajay can roll his tongue while Vijay cannot. What is the genotype of their parents?
Answer: Both the parents are heterozygous dominant.
04 20 PM IST - 24 Mar'25
Class 10 ICSE Biology Answer Key 2025: Questions with Solutions
Aspirants can check the questions with solutions below as per the ICSE Class 10 Biology Answer Key 2025.
Question: The optimum temperature for photosynthesis is:
Answer: 25 - 35^oC
04 00 PM IST - 24 Mar'25
ICSE 10th Biology Answer Key 2025: Questions with Solutions
Aspirants can check the questions with solutions below as per the ICSE Class 10 Biology Answer Key 2025.
Question: Assertion (A): A turgid plant cell is in a balanced state.
Reason (R): In a turgid cell, turgor pressure and wall pressure are equal and in the same direction.
Answer: Both (A) and (R) are true.
03 40 PM IST - 24 Mar'25
ICSE Class 10 Biology Answer Key 2025: Questions with Solutions
Aspirants can check the questions with solutions below as per the ICSE Class 10 Biology Answer Key 2025.
Question: A scientist wanted to conduct a genetic experiment on mice. He cut the tails of all the mice and made them reproduce. What will be the phenotype of the offsprings?
Answer: All the offsprings will have tails.
03 20 PM IST - 24 Mar'25
Class 10 ICSE Biology Answer Key 2025: Questions with Solutions
Aspirants can check the questions with solutions below as per the ICSE Class 10 Biology Answer Key 2025.
Question: The hormone that induces vigorous contractions of the uterus in a pregnant mother is:
Answer: Oxytocin
03 00 PM IST - 24 Mar'25
ICSE 10th Biology Answer Key 2025: Questions with Solutions
Aspirants can check the questions with solutions below as per the ICSE Class 10 Biology Answer Key 2025.
Question: Assertion (A): Seminal vesicles pour an alkaline secretion into the semen as it passes through the ureter.
Reason (R): The female vagina is acidic and needs to be neutralized for sperm survival.
Answer: (A) is false and (R) is true
02 45 PM IST - 24 Mar'25
Class 10 ICSE Biology Answer Key 2025: Questions with Solutions
Aspirants can check the questions with solutions below as per the ICSE Class 10 Biology Answer Key 2025.
Question: The structure that lies at the junction of the choroid and the iris and is itself a part of the choroid is called:
Answer: Ciliary Body
02 30 PM IST - 24 Mar'25
ICSE Class 10 Biology Answer Key 2025 Live: Questions with Solutions
Aspirants can check the questions with solutions below as per the ICSE Class 10 Biology Answer Key 2025.
Question: The number of live births per thousand people per year is called:
Answer: Natality
02 15 PM IST - 24 Mar'25
Is there an official answer key for ICSE Class 10 Biology 2025?
As of now, CISCE does not release an official answer key for Class 10th exams. However, students can refer to unofficial keys for reference.
02 00 PM IST - 24 Mar'25
ICSE 10th Biology Answer Key 2025: Can you object?
Unfortunately, students will not be able to raise their objections to the Class 10 ICSE Biology Answer Key 2025 as it is unofficial in nature. ICSE will not be releasing an official answer key, so students will not have the chance to object to the answer key.
01 45 PM IST - 24 Mar'25
ICSE Class 10 Biology Answer Key 2025: How to access?
The Class 10 ICSE Biology Answer Key 2025 will be directly available here for students to check their answers. Students need not download or visit any page to check their answers.
01 30 PM IST - 24 Mar'25
Is Class 10 ICSE Biology Answer Key 2025 OUT?
The subject experts are working on the Class 10 ICSE Biology Answer Key 2025 which will shortly be out for the students to check. Carefully reading each question the answers are being prepared to ensure accuracy and correctness.
01 15 PM IST - 24 Mar'25
Class 10 ICSE Biology Answer Key 2025 soon!
The question paper for the Class 10 ICSE Biology 2025 exam is now being collected by the CollegeDekho team from the students who have departed from the exam hall to prepare the Class 10 ICSE Biology Answer Key 2025. It is expected to be available soon.
01 00 PM IST - 24 Mar'25
Class 10 ICSE Biology Exam 2025 ends!
The Class 10 ICSE Biology exam 2025 now ends. Collection of answer sheet begins, and as soon as the question paper is available to our experts, the Class 10 ICSE Biology Answer Key 2025 will be available.
12 40 PM IST - 24 Mar'25
Class 10 ICSE Biology Result 2025 Date
The ICSE Class 10 result 2025 for all the subjects will be declared together on the same day. The scorecard will include the marks of all the subjects. Until then students may refer to the Class 10 ICSE Biology Answer Key 2025 provided here for reference to analyse their performances.
12 20 PM IST - 24 Mar'25
Class 10 ICSE Biology Answer Key 2025: How to access?
The Class 10 ICSE Biology Answer Key 2025 will be directly available here for students to check their answers. Students need not download or visit any page to check their answers.
12 00 PM IST - 24 Mar'25
Class 10 ICSE Biology Answer Key 2025: Can you object?
Unfortunately students will not be able to raise their objections to the Class 10 ICSE Biology Answer Key 2025 as it is unofficial in nature. ICSE will not be releasing an official answer key, so students will not have the chance to object to the answer key.
11 40 AM IST - 24 Mar'25
Are Class 10 ICSE Biology Answer Key 2024 reliable?
Yes, the Class 10 ICSE Biology Answer Key 2025 are absolutely reliable as it is being prepared by subject-experts on the basis of the question paper obtained from the students who have appeared for the exams.
11 20 AM IST - 24 Mar'25
Class 10 ICSE Biology Answer Key 2025: Section A
The Class 10 ICSE Biology Answer Key 2025 will be provided for Section A only. As the questions from Section A are objective and have a particular, it will be easy to fit the correct answer. However, questions from Section B include subjective-type questions which are opinion based questions, and students may write their own answers.
11 00 AM IST - 24 Mar'25
Class 10 ICSE Biology 2025 Exam Begins!
Students have now been distributed the question papers with the time of the Class 10 ICSE Biology exam 2025 begins.
10 40 AM IST - 24 Mar'25
Class 10 ICSE Biology Exam 2025: To begin soon
The Class 10 ICSE Biology exam 2025 will begin soon now. Students have now started to enter the exam hall with verification at the gate.
10 20 AM IST - 24 Mar'25
Class 10 ICSE Biology Exam 2025: Last-minute tips!
Here are some helpful tips to complete the Class 10 ICSE Biology exam 2025 smoothly:
- Students should complete the Section A as quickly as possible.
- Leave space for answers to attempt later in case of any doubts.
- It is advisable to draw the diagrams at the last to save time, although it is best to leave space. Make sure to draw and mark clearly each diagram even if not mentioned.
- Maintain the question paper numbering format.
10 00 AM IST - 24 Mar'25
Class 10 ICSE Biology Sample Questions 2025 (8)
Refer to the revision questions here for the Class 10 ICSE Biology Exam 2025:
Question: Answer the following:
1. State two structural differences between an artery and a vein.
2. State any two objectives of Swachh Bharat Abhiyan.
3. Mention any two features of the Cro-Magnon man.
4. Define excretion.
5. Write any two functions of Lymph
09 45 AM IST - 24 Mar'25
Class 10 ICSE Biology Sample Questions 2025 (7)
Refer to the revision questions here for the Class 10 ICSE Biology Exam 2025:
Question: Answer the following:
1. Define – Osmosis.
2. What is the scientific name for man?
3. Name the two sensory cells in retina meant for light adaptation.
4. What are vestigial organs? Give one example.
5. Mention one function each for – Cerebrum and Cerebellum
09 30 AM IST - 24 Mar'25
Class 10 ICSE Biology Sample Questions 2025 (6)
Refer to the revision questions here for the Class 10 ICSE Biology Exam 2025:
Question: Answer the following: (3 Marks each)
1. Draw a neat, labelled diagram of a duplicated chromosome.
2. Draw a neat, labelled diagram of a human gamete that has the sex chromosome.Y
3. Draw a neat, labelled diagram to show the internal structure of a human kidney.
4. Draw a neat, labelled diagram of root hair.
5. Draw a neat, labelled diagram of human sperm.
6. Draw a neat, labelled diagram showing the cross-section of an Artery and Vein.
09 15 AM IST - 24 Mar'25
Class 10 ICSE Biology Sample Questions 2025 (5)
Refer to the revision questions here for the Class 10 ICSE Biology Exam 2025:
Question: Answer the following: (2 Marks each)
1. What are the two hormones secreted by Corpus luteum?
2. Differentiate between Menarche and Menopause.
3. What is the significance of placenta in the growth of foetus?
4. Mention the contraception methods in man and woman.
5. name two harmful effects of noise pollution.
09 00 AM IST - 24 Mar'25
Class 10 ICSE Biology Sample Questions 2025 (4)
Refer to the revision questions here for the Class 10 ICSE Biology Exam 2025:
Question: Answer the following: (2 Marks each)
1. State Mendel’s Law of Dominance.
2. What are Homologous chromosomes?
3. Differentiate between Phenotype and Genotype.
4. Write the difference between the terms Phenotype and Genotype.
5. What are tropic hormones? Give examples.
08 45 AM IST - 24 Mar'25
Class 10 ICSE Biology Sample Questions 2025 (3)
Refer to the revision questions here for the Class 10 ICSE Biology Exam 2025:
Question: Fill in the blanks with suitable words:
1. The technical term for short sightedness is (a) __________. This defect is caused because the eyeball is (b) __________ from front to back or the lens is too (c) __________. It can be corrected by using a suitable (d) __________ lens. The power of the lens is mentioned in (e) __________.
08 30 AM IST - 24 Mar'25
Class 10 ICSE Biology Sample Questions 2025 (2)
Refer to the revision questions here for the Class 10 ICSE Biology Exam 2025:
Question: Name the following:
1. The duct which carries urine from the urinary bladder to outside the body.
2. The structure that connects the placenta and the human foetus.
3. The Basic Units of Heredity.
4. The nitrogenous base that pairs with adenine
5. The collective term for the protective membranes of the brain.
08 15 AM IST - 24 Mar'25
Class 10 ICSE Biology Sample Questions 2025 (1)
Refer to the revision questions here for the Class 10 ICSE Biology Exam 2025:
Question: Name the following:
1. The respiratory pigment in Erythrocytes.
2. The knot like mass of blood capillaries in Bowman's Capsule.
3. The tissue that transports manufactured food from the leaves to all the parts of the plant.
4. The statistical study of Human population.
5. The type of gene, which in the presence of a contrasting allele, is not expressed.
08 00 AM IST - 24 Mar'25
Class 10 ICSE Biology Exam 2025 Today at 11 AM
As per the schedule, the Class 10 ICSE Biology exam 2025 will be conducted today, March 23, 2025, at 11 AM at all exam centres for students appearing for the exam. The exam will be for two hours, so, it will end at 1 PM. Soon after which, the Class 10 ICSE Biology Answer Key 2925 will be provided here.