CBSE Class 10 Science Chapter 7 How do Organisms Reproduce Important Questions 2027
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21 questions from How do Organisms Reproduce appeared in 7 of the 7 CBSE papers we analysed (2022–2026) — here are the topics that matter, the questions that repeat, and every previous-year question from this chapter.
Key facts
- World of Living unit — 25 marks in the official syllabus
- Asked in 7 of 7 analysed papers (2022–2026)
- About 3.0 questions per paper (OR alternatives counted separately)
- 5 question patterns repeated across papers
Important topics in How do Organisms Reproduce
| # | Topic | Asked in | Importance |
|---|---|---|---|
| 1 | Asexual reproduction modes with examples | Board 2022Board 2023Board 2024Board 2025Board 2026Sample 2025Sample 2026 | ★★☆☆☆ |
| 2 | Sexual reproduction in flowering plants (flower parts, fertilisation) | Board 2022Board 2023Board 2025Board 2026Sample 2026 | ★★☆☆☆ |
| 3 | Human reproductive system (male/female) | Board 2022Board 2025Sample 2025 | ★☆☆☆☆ |
| 4 | Reproductive health, contraception and family planning | Board 2024 | ★☆☆☆☆ |
Repeated questions from How do Organisms Reproduce
1. Vegetative propagation of banana and variation
2×Sample 2025Sample 20265 marks
Puneet wanted to grow banana plants. (i) Based on your knowledge on plant reproduction should he opt for seeds or any alternate method of reproduction? Justify your answer. (ii) Offsprings of a banana plant usually show very little variation. What causes variation and are variations good or bad? Justify.
2. Draw/describe Hydra budding or Rhizopus spore formation
2×Board 2024Board 20252/5 marks
Draw labelled diagrams to show different stages of budding in Hydra.
3. Differentiate self vs cross pollination (with flower parts/diagram)
2×Board 2023Board 20255 marks
(i) Differentiate between self-pollination and cross-pollination. (ii) Identify A, B and C in the diagram given below (a diagram of a flower/pistil showing pollen germination and the ovule - see figure) and write one function of each.
4. Functions of reproductive organs
2×Board 2022Board 20253/5 marks
(i) Write the functions of the following parts of human female reproductive system: (I) Ovary (II) Fallopian tube (III) Uterus. (ii) State briefly two contraceptive methods used by human males.
5. Identify organism by asexual mode + example
2×Board 2022Board 20241/2 marks
In which of the following organisms, multiple fission is a means of asexual reproduction? (a) Yeast (b) Leishmania (c) Paramoecium (d) Plasmodium
How do Organisms Reproduce questions by paper
| Paper | Questions | Marks |
|---|---|---|
| Board 2022 | 3 | 7 |
| Board 2023 | 2 | 6 |
| Board 2024 | 3 | 11 |
| Board 2025 | 5 | 16 |
| Sample 2025 | 3 | 11 |
| Board 2026 | 3 | 5 |
| Sample 2026 | 2 | 10 |
Counts include both options of internal-choice (OR) questions.
Previous year questions: How do Organisms Reproduce
Board 2026 3 questions
If the part 'P' of the flower is removed, which of the following processes will not take place? (A) Formation of pollens (B) Formation of flower (C) Formation of fruit (D) Formation of seed
Assertion (A): Variations are not often seen in off-springs produced by asexual reproduction. Reason (R): DNA molecule generated by replication is not similar to the original DNA. (A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). (B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A). (C) Assertion (A) is true, but Reason (R) is false. (D) Assertion (A) is false, but Reason (R) is true.
Give reasons for the following: (a) Adrenal gland is known as the stress gland of the body. (b) Prenatal sex determination is banned in India. (c) Vegetative propagation is advantageous in some plants.
Sample 2026 2 questions
Puneet wanted to grow banana plants. (i) Based on your knowledge on plant reproduction should he opt for seeds or any alternate method of reproduction? Justify your answer. (ii) Offsprings of a banana plant usually show very little variation. What causes variation and are variations good or bad? Justify.
Annie was conducting research on the number of fruits produced by watermelon under different conditions. She grew 25 watermelon plants each in both glass house A and B. She introduced pollinators in glass house A only. (i) What difference will she observe in the number of fruits produced in the two glass houses? Explain with reason. (ii) List 3 changes that will occur in a flower once it gets fertilized.
Board 2025 5 questions
The correct/true statement(s) for a bisexual flower is/are : (i) They possess both stamen and pistil. (ii) They possess either stamen or pistil. (iii) They exhibit either self-pollination or cross-pollination. (iv) They cannot produce fruits on their own. (A) (i) only (B) (iv) only (C) (i) and (iii) (D) (i) and (iv)
Draw labelled diagrams to show different stages of budding in Hydra.
(a) What are chromosomes ? (b) Explain in brief how stability of DNA content of a species is ensured in sexually reproducing organisms ?
(i) Write the functions of the following parts of human female reproductive system: (I) Ovary (II) Fallopian tube (III) Uterus. (ii) State briefly two contraceptive methods used by human males.
(i) Differentiate between self-pollination and cross-pollination. (ii) Identify A, B and C in the diagram given below (a diagram of a flower/pistil showing pollen germination and the ovule - see figure) and write one function of each.
Sample 2025 3 questions
Assertion (A): The number of chromosomes in a cell and in a germ cell is not the same in any species. Reason (R): When 2 germ cells combine they restore the normal number of chromosomes in a species. [Options: A. Both A and R are true, and R is the correct explanation of A. B. Both A and R are true, and R is not the correct explanation of A. C. A is true but R is false. D. A is false but R is true]
Attempt either option A or B. A. A banana plant is growing with the help of suckers. These suckers are small plant stem outgrowths which can be separated from the main plant and planted separately and they will grow into a new plant subsequently. (i) Give the name and type of reproduction that is shown. (1) (ii) List two advantages the farmer will have on using the type of reproduction mentioned above. (2) (iii) The plant produces male flowers. Explain how this plant will be involved in the process of pollination. (1) (iv) Why is the offspring of this banana plant not absolutely identical to its parent plant? (1)
Attempt either option A or B. B. A developing fetus is connected to the placenta by means of umbilical cord. The Umbilical vein and artery run inside the umbilical cord. (i) Name two substances that move through the blood vessels. (1) (ii) If the placenta has less villi how will it affect the baby's growth? (1) (iii) Name the region where the embryo develops inside the female body. Explain how this region is adapted for nourishing the baby. (1) (iv) Some of the fetal cells fall off into the amniotic fluid and can be collected by careful procedure. The cells were screened and found to contain XY chromosome. (2) a) What is the sex of the foetus? b) How is this prenatal sex determination misused?
Board 2024 3 questions
In which of the following organisms, multiple fission is a means of asexual reproduction? (a) Yeast (b) Leishmania (c) Paramoecium (d) Plasmodium
(i) Name three techniques/devices used by human females to avoid pregnancy. Mention the side effects caused by each. (ii) What will happen if in a human female (a) fertilisation takes place, (b) an egg is not fertilised?
(i) Draw a diagram showing spore formation in Rhizopus and label the (a) reproductive and (b) non-reproductive parts. Why does Rhizopus not multiply on a dry slice of bread? (ii) Name and explain the process by which reproduction takes place in Hydra.
Board 2023 2 questions
Select the INCORRECT match (between the plant and its vegetative part) from the following: (a) Bryophyllum, leaf (b) Potato, stem (c) Money-plant, stem (d) Rose, root
(a) Name the parts of a bisexual flower that are not directly involved in reproduction. (b) Differentiate between self pollination and cross pollination. List any two significance of pollination. (c) What is the fate of ovules and ovary after fertilization in a flower?
Board 2022 3 questions
(a) Which of the following flowers will have higher possibility of self-pollination? Mustard, Papaya, Watermelon, Hibiscus. (b) List the two reproductive parts of a bisexual flower.
Which one of the two multicellular organisms - Spirogyra and Planaria reproduces by regeneration and why? Give an example of any other organism which can also reproduce by the same process.
(a) Mention one function each of the following organs in human male reproductive system: (i) Testis (ii) Scrotum (iii) Vas deferens (iv) Prostate gland. (b) Name the type of germ cell which (i) is motile, and (ii) stores food.
Frequently asked questions
What are the most important topics in CBSE Class 10 Science Chapter 7 How do Organisms Reproduce?
By how often and how recently they were asked: Asexual reproduction modes with examples; Sexual reproduction in flowering plants (flower parts, fertilisation); Human reproductive system (male/female).
How many marks does How do Organisms Reproduce carry in the CBSE Class 10 Science exam?
How do Organisms Reproduce is part of the World of Living unit, which carries 25 marks in the official syllabus. In the analysed papers it had about 3.0 questions per paper.
Do questions from How do Organisms Reproduce repeat in board exams?
Yes — 5 question patterns from this chapter appeared in two or more past board or official sample papers. They are listed on this page with the years they were asked.