ICSE Class 10 Biology Question Paper 2023

About this paper

This is the official ICSE Class 10 Biology (Science Paper 3) question paper from the 2023 examination, paper code T23 523. It carries 80 marks, with two hours of writing time plus 15 minutes of reading time. Section A (40 marks) is compulsory: Question 1 has 15 one-mark multiple-choice questions, and Question 2 has five parts on naming, logical sequences, matching hormonal disorders, odd one out and exact locations. In Section B candidates attempt any four of Questions 3–8, each worth 10 marks and built from one-, two- and three-mark parts, including picture-based items on a shoot movement, climate change, a variegated-leaf experiment and the heart. The paper has questions only, without answers.

Exam

ICSE Class 10

Subject

Biology

Year

2023

Paper code

T23 523

Maximum marks

80

Time allowed

2 hours + 15 min reading

Questions

8

Pages

11

Answers included

No, questions only

Paper pattern

• Section A – Question 1

  15 marks

  15 multiple-choice questions, one mark each

• Section A – Question 2

  25 marks

  Five five-mark parts: naming, logical sequences, matching, odd one out and exact locations

• Section B

  40 marks

  Questions 3–8, attempt any four; each 10 marks, split into five parts of one to three marks

Topics covered

• Cell cycle and cell division
• Genetics and Mendel's laws
• Photosynthesis
• Transpiration
• Plant movements and hormones
• Circulatory system
• Excretory system
• Nervous system
• Sense organs: eye and ear
• Endocrine system
• Human reproduction
• Population and climate change

Questions from this paper

1. Differentiate between karyokinesis and cytokinesis.
2. Excessive use of fertilisers in agricultural fields reduces the yield of crops. Justify the statement.
3. State Mendel's Law of Segregation.
4. The renal cortex has a dotted appearance and the renal medulla has a striped appearance. Explain.
5. What is the significance of the human testes being located in scrotal sacs outside the abdomen?
6. A pure-breeding red-flowered pea plant (RR) is crossed with a pure-breeding white-flowered pea plant (rr). Draw a Punnett square to find the phenotypic and genotypic ratios of the F2 generation.