ICSE Class 10 Biology Answer Key 2024, Get Free PDF Download

ICSE Class 10 Biology Answer Key 2024: ICSE Class 10 Biology exam was conducted on March 18, 2024. The paper was held for 2 hours and 15 minutes, including the question paper reading time. This was Science Paper 3 for ICSE students, with Physics and  Chemistry being Paper 1 and Paper 2 respectively. Students and teachers have reviewed the Biology paper to be moderately easy. Here’s the question paper PDF for the ICSE Class 10 Biology Exam 2024 along with its answer key. The answer key includes answers and solutions to the questions asked in the Biology paper. These answers have been crafted by the subject matter experts. Students can use these resources to know the correctness of their answers and evaluate their performance in the exam.

You can also check the link below to know the detailed analysis of the ICSE Class 10 Biology Exam 2024 which also includes reactions shared by students and teachers for more clarity on the difficulty level of the exam.

ICSE Class 10 Biology Paper Pattern 2024

The question paper for Biology in the ICSE Board Exam 2024 was for 80 marks.

• There were 8 questions divided into two sections:
• Section A - MCQs and Objective Type Questions (40 Marks)
• Section B - Descriptive Answer Type Questions (40 Marks)
• All the questions in Section A were compulsory.
• In Section B students were required to attempt any four questions.

ICSE Class 10 Biology Question Paper 2024

Download the complete question paper from the link provided below:

ICSE Class 10 Biology Paper Answer Key 2024

SECTION A

Question 1

Select the correct answers to the questions from the given options.

(i)Duplicated chromosomes are joined at a point termed:

(a) Centrosome

(b) Centromere

(c) Centriole

(d) Chromatid

Answer: (b) Centromere

(ii)The process of conversion of ADP to ATP during photosynthesis is called:

(a) Photolysis

(b) Phagocytosis

(c) Photophosphorylation

(d) Polymerisation

Answer: (c) Photophosphorylation

(iii)The process in which water is lost from the margins of strawberry leaves is

(a) Osmosis

(b) Imbibition

(c) Diffusion

(d) Guttation

Answer: (d) Guttation

(iv) The hormone that affects urination is:

(a) Adrenaline

(b) Vasopressin

(c) Oestrogen

(d) Thyroxine

Answer: (b) Vasopressin

(v)Which one of the following helps in the opening of stomata:

(a) Cobalt ions

(b) Potassium ions

(c) Magnesium ions

(d) Aluminium ions

Answer: (b) Potassium ions

(vi)A zygote which has Y chromosome inherited from the father will develop into a:

(a) Will depend on the chromosome inherited from the mother

(b) Girl

(c) Either boy or a girl

(d) Boy

Answer: (d) Boy

Explanation: Sex chromosomes of women have two X chromosomes and men have one X and one Y chromosome. If an X chromosome arrives from the male then the zygote will have XX chromosomes on fusion with the X chromosome of the female and the resulting offspring will be a girl. On the other hand, If a Y chromosome arrives from the male then the zygote will have XY chromosomes on fusion with the X chromosome of the female and the resulting offspring will be a boy.

(vii)The ear ossicle that transports sound vibrations to the inner ear.

(a) Stapes

(b) Malleus

(c) Incus

(d) Cochlea

Answer: (b) Malleus

(viii) If a person has a heart attack, what must be done immediately?

P. Loosen his/her clothing

Q. Make him/her lie down in an airy room

R. Rush him/her to the hospital

S. Engage him/her in a conversation

(a) P and Q

(b) P and S

(c) R and S

(d) P, Q and R

Answer: (d) P, Q and R

(ix)Adjusting the focal length of the eye lens to view objects at different distances is done by:

(a) Cornea

(b) Iris

(c) Ciliary muscles

(d) Sclera

Answer: (c) Ciliary muscles

(x)Four friends P, Q, R and S were discussing the examples of genetic disorders. The examples they quoted were as follows:

P.Colour blindness and Malaria

Q.Albinism and Cholera

R.Haemophilia and Colour blindness

S.Haemophilia and Albinism

Who gave the correct examples?

(a) P and Q

(b) R and S

(c) P and R

(d) Q and S

Answer: (b) R and S

Explanation: Malaria is caused by a parasite transmitted through the bite of infected mosquitoes while Cholera is a bacterial infection caused by ingesting contaminated food or water.

Hemophilia, albinism and colour blindness are genetic disorders.

(xi)Osmosis takes place when there is

(a) A freely permeable membrane

(b) cell wall

(c) selectively permeable membrane

(d) An impermeable membrane

Answer: (c) selectively permeable membrane

(xii)A male gorilla has 48 chromosomes in each of its body cells. How many chromosomes will each of the sperms have?

(a) 24

(b) 48

(c) 12

(d) 16

Answer: (a) 24

(xiii) Assertion (A): Sympathetic nervous system prepares the body for violent action against abnormal conditions.

Reason (R): Sympathetic nervous system accelerates heartbeat.

Which of the following is correct?

(a) Both A and R are True

(b) A is True, R is False

(c) A is False but R is True

(d) Both A and R are False

Answer: (a) Both A and R are True

(xiv) Birth rate is the number of live births per thousand persons in:

(a) 1 year

(b) 2 years

(c) 10 years

(d) 20 years

Answer: (a) 1 year

(xv) Industrial Melanism was observed in:

(a) Mice

(b) Peppered Moth

(c) House Flies

(d) Crow

Answer: (b) Peppered Moth

Question 2

(i) Name the following:

(a) Unicellular outgrowths from the epidermis of roots.

(b) A defect in our eyes, in which some parts of the object are in focus while the other parts are blurred.

(c) The tropic movement of plant parts in response to chemicals.

(d) The main nitrogenous waste formed in the body.

(e) The process of attachment of fertilized ovum to the wall of uterus.

Answer:

(a) Root hairs

(b) Astigmatism

(c) Chemotropism

(d) Urea

(e) Implantation

(ii) Arrange and rewrite the terms in each group in the correct order to be in a logical sequence beginning with the term that is underlined:

(a) Australopithecus, Cro-Magnon, Homo erectus, Neanderthal man.

(b) Pupil, Aqueous humour, Retina, Vitreous humour.

(c) Effector, Receptor, Motor neuron, Sensory neuron.

(d) Loop of Henle, Distal convoluted tubule, Bowman's Capsule, Proximal convoluted tubule.

(e) Water vapour, Soil water, Leaves, Ascent of Sap

Answer:

(a) Correct sequence of evolution till modern humans:

Australopithecus → Homo erectus → Neanderthal man → Cro-magnon man 

(b) Correct sequence for pathway of light through the eye to the retina:

Aqueous humour →  Pupil →  Vitreous humour →  Retina

(c) Correct sequence of the components in reflex arc is:

Receptor → Sensory neuron → Motor neuron → Effector

(d) Correct sequence of the parts of kidney is:

Bowman's capsule → Proximal convoluted tubule → Loop of Henle → Distal convoluted tubule

(e) Correct order of water movement in plants is:

Soil water →  Roots → Leaves → Ascent of Sap

Also Check:

ICSE Class 10 Specimen Paper 2024

ICSE Class 10 Syllabus 2024