ICSE Biology Past Year Paper with Solutions - 2024 | Biology Class 10 ICSE PDF Download

 Page 1


Biology [Official] 
CISCE 
(English Medium) 
Academic Year: 2023-2024 
Date & Time: 18th March 2024, 11:00 am 
Duration: 2h          Marks: 80 
1. Answers to this Paper must be written on the paper provided separately. 
2. You will not be allowed to write during the first 15 minutes. 
3. This time is to be spent reading the question paper. 
4. The time given at the head of this Paper is the time allowed for writing the answer
s. 
5. Section A is compulsory. Attempt any four questions from Section B. 
6. The intended marks for questions or parts of questions are given in brackets [ ]. 
SECTION-A (40 Marks) (Attempt all questions from this Section.) 
Question 1. Select the correct answers to the questions from the given options. (Do not 
copy the questions, write the correct answer only). 
1.1. Duplicated chromosomes are joined at a point termed ______. 
1. Centrosome 
2. Centromere 
3. Centriole 
4. Chromatid 
Solution 
Duplicated chromosomes are joined at a point termed centromere. 
Explanation: 
Until they are split during cell division, the centromere is the point of attachment 
between the two sister chromatids of a chromosome. 
Page 2


Biology [Official] 
CISCE 
(English Medium) 
Academic Year: 2023-2024 
Date & Time: 18th March 2024, 11:00 am 
Duration: 2h          Marks: 80 
1. Answers to this Paper must be written on the paper provided separately. 
2. You will not be allowed to write during the first 15 minutes. 
3. This time is to be spent reading the question paper. 
4. The time given at the head of this Paper is the time allowed for writing the answer
s. 
5. Section A is compulsory. Attempt any four questions from Section B. 
6. The intended marks for questions or parts of questions are given in brackets [ ]. 
SECTION-A (40 Marks) (Attempt all questions from this Section.) 
Question 1. Select the correct answers to the questions from the given options. (Do not 
copy the questions, write the correct answer only). 
1.1. Duplicated chromosomes are joined at a point termed ______. 
1. Centrosome 
2. Centromere 
3. Centriole 
4. Chromatid 
Solution 
Duplicated chromosomes are joined at a point termed centromere. 
Explanation: 
Until they are split during cell division, the centromere is the point of attachment 
between the two sister chromatids of a chromosome. 
1.2. The process of conversion of ADP to ATP during photosynthesis is called ______. 
1. Photolysis 
2. Phagocytosis 
3. Photophosphorylation 
4. Polymerisation 
Solution 
The process of conversion of ADP to ATP during photosynthesis is 
called photophosphorylation. 
Explanation: 
A phosphate group (a process known as phosphorylation) transforms adenosine 
diphosphate into adenosine triphosphate. Photophosphorylation (photo means light) is 
the process by which this is accomplished with light energy during photosynthesis. 
1.3. The process in which water is lost from the margins of strawberry leaves is ______. 
1. Osmosis 
2. Imbibition 
3. Diffusion 
4. Guttation 
Solution 
The process in which water is lost from the margins of strawberry leaves is guttation. 
Explanation: 
Guttation is the process by which liquid water droplets from the leaves are removed. 
This morning process takes place on the leaves margins of the strawberry plant through 
pores known as hydathodes. 
1.4. The hormone that affects urination is ______. 
1. Adrenaline 
2. Vasopressin 
3. Oestrogen 
4. Thyroxine 
Page 3


Biology [Official] 
CISCE 
(English Medium) 
Academic Year: 2023-2024 
Date & Time: 18th March 2024, 11:00 am 
Duration: 2h          Marks: 80 
1. Answers to this Paper must be written on the paper provided separately. 
2. You will not be allowed to write during the first 15 minutes. 
3. This time is to be spent reading the question paper. 
4. The time given at the head of this Paper is the time allowed for writing the answer
s. 
5. Section A is compulsory. Attempt any four questions from Section B. 
6. The intended marks for questions or parts of questions are given in brackets [ ]. 
SECTION-A (40 Marks) (Attempt all questions from this Section.) 
Question 1. Select the correct answers to the questions from the given options. (Do not 
copy the questions, write the correct answer only). 
1.1. Duplicated chromosomes are joined at a point termed ______. 
1. Centrosome 
2. Centromere 
3. Centriole 
4. Chromatid 
Solution 
Duplicated chromosomes are joined at a point termed centromere. 
Explanation: 
Until they are split during cell division, the centromere is the point of attachment 
between the two sister chromatids of a chromosome. 
1.2. The process of conversion of ADP to ATP during photosynthesis is called ______. 
1. Photolysis 
2. Phagocytosis 
3. Photophosphorylation 
4. Polymerisation 
Solution 
The process of conversion of ADP to ATP during photosynthesis is 
called photophosphorylation. 
Explanation: 
A phosphate group (a process known as phosphorylation) transforms adenosine 
diphosphate into adenosine triphosphate. Photophosphorylation (photo means light) is 
the process by which this is accomplished with light energy during photosynthesis. 
1.3. The process in which water is lost from the margins of strawberry leaves is ______. 
1. Osmosis 
2. Imbibition 
3. Diffusion 
4. Guttation 
Solution 
The process in which water is lost from the margins of strawberry leaves is guttation. 
Explanation: 
Guttation is the process by which liquid water droplets from the leaves are removed. 
This morning process takes place on the leaves margins of the strawberry plant through 
pores known as hydathodes. 
1.4. The hormone that affects urination is ______. 
1. Adrenaline 
2. Vasopressin 
3. Oestrogen 
4. Thyroxine 
Solution 
The hormone that affects urination is vasopressin. 
Explanation: 
Secreted by the posterior lobe of the pituitary gland, vasopressin, sometimes known as 
antiduretic hormone (ADH), regulates the osmotic pressure of bodily fluids. It stimulates 
water reabsorption in the nephrons and returns it into the body's blood flow. Less 
quantity and concentrated urine are thus produced in the kidneys. 
1.5. Which one of the following helps in the opening of stomata? 
1. Cobalt ions 
2. Potassium ions 
3. Magnesium ions 
4. Aluminium ions 
Solution 
Potassium ions 
Explanation: 
Potassium ions play a part in opening and closing the stomata holes. Guard cells become 
hypertonic and water enters them as the K+ ion concentration rises there. This swells 
them, and when the membrane stretches, the stomata pore opens. In the shutting of 
stomata, the reverse occurs. K+ ion concentration lowers; the cell becomes hypotonic 
and water leaves the cell, flaccid. 
1.6. A zygote which has Y chromosome inherited from the father will develop into a 
______. 
1. Will depend on the chromosome inherited from the mother 
2. Girl 
3. Either boy or a girl 
4. Boy 
Solution 
A zygote which has Y chromosome inherited from the father will develop into a boy. 
Page 4


Biology [Official] 
CISCE 
(English Medium) 
Academic Year: 2023-2024 
Date & Time: 18th March 2024, 11:00 am 
Duration: 2h          Marks: 80 
1. Answers to this Paper must be written on the paper provided separately. 
2. You will not be allowed to write during the first 15 minutes. 
3. This time is to be spent reading the question paper. 
4. The time given at the head of this Paper is the time allowed for writing the answer
s. 
5. Section A is compulsory. Attempt any four questions from Section B. 
6. The intended marks for questions or parts of questions are given in brackets [ ]. 
SECTION-A (40 Marks) (Attempt all questions from this Section.) 
Question 1. Select the correct answers to the questions from the given options. (Do not 
copy the questions, write the correct answer only). 
1.1. Duplicated chromosomes are joined at a point termed ______. 
1. Centrosome 
2. Centromere 
3. Centriole 
4. Chromatid 
Solution 
Duplicated chromosomes are joined at a point termed centromere. 
Explanation: 
Until they are split during cell division, the centromere is the point of attachment 
between the two sister chromatids of a chromosome. 
1.2. The process of conversion of ADP to ATP during photosynthesis is called ______. 
1. Photolysis 
2. Phagocytosis 
3. Photophosphorylation 
4. Polymerisation 
Solution 
The process of conversion of ADP to ATP during photosynthesis is 
called photophosphorylation. 
Explanation: 
A phosphate group (a process known as phosphorylation) transforms adenosine 
diphosphate into adenosine triphosphate. Photophosphorylation (photo means light) is 
the process by which this is accomplished with light energy during photosynthesis. 
1.3. The process in which water is lost from the margins of strawberry leaves is ______. 
1. Osmosis 
2. Imbibition 
3. Diffusion 
4. Guttation 
Solution 
The process in which water is lost from the margins of strawberry leaves is guttation. 
Explanation: 
Guttation is the process by which liquid water droplets from the leaves are removed. 
This morning process takes place on the leaves margins of the strawberry plant through 
pores known as hydathodes. 
1.4. The hormone that affects urination is ______. 
1. Adrenaline 
2. Vasopressin 
3. Oestrogen 
4. Thyroxine 
Solution 
The hormone that affects urination is vasopressin. 
Explanation: 
Secreted by the posterior lobe of the pituitary gland, vasopressin, sometimes known as 
antiduretic hormone (ADH), regulates the osmotic pressure of bodily fluids. It stimulates 
water reabsorption in the nephrons and returns it into the body's blood flow. Less 
quantity and concentrated urine are thus produced in the kidneys. 
1.5. Which one of the following helps in the opening of stomata? 
1. Cobalt ions 
2. Potassium ions 
3. Magnesium ions 
4. Aluminium ions 
Solution 
Potassium ions 
Explanation: 
Potassium ions play a part in opening and closing the stomata holes. Guard cells become 
hypertonic and water enters them as the K+ ion concentration rises there. This swells 
them, and when the membrane stretches, the stomata pore opens. In the shutting of 
stomata, the reverse occurs. K+ ion concentration lowers; the cell becomes hypotonic 
and water leaves the cell, flaccid. 
1.6. A zygote which has Y chromosome inherited from the father will develop into a 
______. 
1. Will depend on the chromosome inherited from the mother 
2. Girl 
3. Either boy or a girl 
4. Boy 
Solution 
A zygote which has Y chromosome inherited from the father will develop into a boy. 
Explanation: 
The combination will have XY set in this regard because the mother always carries the X 
chromosome. That will be a boy, then. 
1.7. The ear ossicle that transports sound vibrations to the inner ear: 
1. Stapes 
2. Mal 
3. Incus 
4. Cochlea 
Solution 
Stapes 
Explanation: 
The innermost bone of the middle ear, the stapes, links it to the inner ear. From the 
malleus and incus, the sound waves proceed to stape into the inner ear. The cochlea is 
not an ossicle or ear. 
1.8. 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 
1. P and Q 
2. P and S 
3. R and S 
4. P, Q and R 
Solution 
P, Q and R 
Explanation: 
Page 5


Biology [Official] 
CISCE 
(English Medium) 
Academic Year: 2023-2024 
Date & Time: 18th March 2024, 11:00 am 
Duration: 2h          Marks: 80 
1. Answers to this Paper must be written on the paper provided separately. 
2. You will not be allowed to write during the first 15 minutes. 
3. This time is to be spent reading the question paper. 
4. The time given at the head of this Paper is the time allowed for writing the answer
s. 
5. Section A is compulsory. Attempt any four questions from Section B. 
6. The intended marks for questions or parts of questions are given in brackets [ ]. 
SECTION-A (40 Marks) (Attempt all questions from this Section.) 
Question 1. Select the correct answers to the questions from the given options. (Do not 
copy the questions, write the correct answer only). 
1.1. Duplicated chromosomes are joined at a point termed ______. 
1. Centrosome 
2. Centromere 
3. Centriole 
4. Chromatid 
Solution 
Duplicated chromosomes are joined at a point termed centromere. 
Explanation: 
Until they are split during cell division, the centromere is the point of attachment 
between the two sister chromatids of a chromosome. 
1.2. The process of conversion of ADP to ATP during photosynthesis is called ______. 
1. Photolysis 
2. Phagocytosis 
3. Photophosphorylation 
4. Polymerisation 
Solution 
The process of conversion of ADP to ATP during photosynthesis is 
called photophosphorylation. 
Explanation: 
A phosphate group (a process known as phosphorylation) transforms adenosine 
diphosphate into adenosine triphosphate. Photophosphorylation (photo means light) is 
the process by which this is accomplished with light energy during photosynthesis. 
1.3. The process in which water is lost from the margins of strawberry leaves is ______. 
1. Osmosis 
2. Imbibition 
3. Diffusion 
4. Guttation 
Solution 
The process in which water is lost from the margins of strawberry leaves is guttation. 
Explanation: 
Guttation is the process by which liquid water droplets from the leaves are removed. 
This morning process takes place on the leaves margins of the strawberry plant through 
pores known as hydathodes. 
1.4. The hormone that affects urination is ______. 
1. Adrenaline 
2. Vasopressin 
3. Oestrogen 
4. Thyroxine 
Solution 
The hormone that affects urination is vasopressin. 
Explanation: 
Secreted by the posterior lobe of the pituitary gland, vasopressin, sometimes known as 
antiduretic hormone (ADH), regulates the osmotic pressure of bodily fluids. It stimulates 
water reabsorption in the nephrons and returns it into the body's blood flow. Less 
quantity and concentrated urine are thus produced in the kidneys. 
1.5. Which one of the following helps in the opening of stomata? 
1. Cobalt ions 
2. Potassium ions 
3. Magnesium ions 
4. Aluminium ions 
Solution 
Potassium ions 
Explanation: 
Potassium ions play a part in opening and closing the stomata holes. Guard cells become 
hypertonic and water enters them as the K+ ion concentration rises there. This swells 
them, and when the membrane stretches, the stomata pore opens. In the shutting of 
stomata, the reverse occurs. K+ ion concentration lowers; the cell becomes hypotonic 
and water leaves the cell, flaccid. 
1.6. A zygote which has Y chromosome inherited from the father will develop into a 
______. 
1. Will depend on the chromosome inherited from the mother 
2. Girl 
3. Either boy or a girl 
4. Boy 
Solution 
A zygote which has Y chromosome inherited from the father will develop into a boy. 
Explanation: 
The combination will have XY set in this regard because the mother always carries the X 
chromosome. That will be a boy, then. 
1.7. The ear ossicle that transports sound vibrations to the inner ear: 
1. Stapes 
2. Mal 
3. Incus 
4. Cochlea 
Solution 
Stapes 
Explanation: 
The innermost bone of the middle ear, the stapes, links it to the inner ear. From the 
malleus and incus, the sound waves proceed to stape into the inner ear. The cochlea is 
not an ossicle or ear. 
1.8. 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 
1. P and Q 
2. P and S 
3. R and S 
4. P, Q and R 
Solution 
P, Q and R 
Explanation: 
In the case of a heart attack, the patient must be made comfortable and ventilated 
properly. Any form of stress should be avoided. As a result, loosening tight clothes and 
causing him/her to lie down in an airy environment is correct. Also, we should rush the 
guy to the hospital. However, conversing with others can exhaust and stress a person. 
1.9. Adjusting the focal length of the eye lens to view objects at different distances is 
done by ______. 
1. Cornea 
2. Iris 
3. Ciliary muscles 
4. Sclera 
Solution 
Adjusting the focal length of the eye lens to view objects at different distances is done 
by ciliary muscles. 
Explanation: 
Ciliary muscles both contract and relax to respectively make the eye lens thicker and 
flattening. This alters the eye lens's focus length and enables variable distance object 
viewing. 
1.10. 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? 
1. P and Q 
2. R and S 
3. P and R 
4. Q and S