How many marks does "How do Organisms Reproduce?" carry in Bihar Board Class 10 Science?

In the Bihar Board papers of 2021–2026, this chapter carried about 5 marks and about 6 questions a year; by marks it ranks 8 in Science.

Which are the most important (VVI) questions of "How do Organisms Reproduce?"?

The 18 questions above are from the board’s real papers, each with the years it was asked; the most-asked come first with their full model answers. All 18 written questions of this chapter, with answers, are in the AskMedha app.

Do the answers follow the board’s marking scheme?

BSEB does not publish a marking scheme. Each answer is written point by point on a structure derived from past papers and checked by a second, independent model; it is never called the board’s official scheme.

Bihar Board Class 10 · Science · Matric exam 2027

Chapter 8: How do Organisms Reproduce?

This chapter’s questions from Bihar Board (BSEB)’s real papers of 2021–2026 — the 18 asked most often, 3 with the full model answer, 13 with how the answer begins — and objective questions with the board’s key.

marks a year (about): 5
questions a year (about): 6
rank in Science: #8

From 6 years of papers, 2021–2026 · full chapter-wise marks

Chapter 8 notes (PDF) →

VVI questions — the ones the board asked most (18)

Q1Long answer5 marksAsked: 2026
What is the advantage of sexual reproduction over asexual reproduction ?
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Model answer · Advantages of sexual reproduction
1. 1.The main advantage of sexual reproduction is that it produces much more variation. In sexual reproduction, DNA from two different individuals, a male and a female, is combined. Each offspring therefore gets a new combination of variations. In asexual reproduction, a new generation comes from a single individual. Its offspring are almost identical copies of the parent, and variation arises only slowly through small errors in DNA copying.1.5 marks
2. 2.These variations help a species adapt to a changing environment. If the niche in which a population lives is drastically altered, a population of identical individuals could be wiped out. For example, when the water temperature rises because of global warming, most bacteria die. However, the few variants resistant to heat survive and grow further. In this way, variation ensures the survival of the species and reduces its chance of becoming extinct.1.5 marks
3. 3.Because sexual reproduction creates new variations faster, it speeds up evolution, the emergence of new species. Asexual reproduction produces identical offspring, so evolution is slower.1 mark
4. 4.The variations combined in sexual reproduction come from living individuals, so they do not have any really bad effects. These new combinations reduce the effect of harmful mutations, so the offspring receive healthier and stronger traits.1 mark
- Compare both modes of reproduction: in sexual reproduction, DNA from two individuals combines to give variation, while asexual reproduction gives identical offspring.
- Say that variation helps the species adapt to a changing environment and survive, and give the example of heat-resistant bacteria.
- Write that sexual reproduction speeds up evolution and that the offspring get healthier and stronger traits.
Marks split from a structure derived from past papers (checked twice); not Bihar Board’s official scheme
Q2Long answer5 marksAsked: 2023
Explain the fertilisation process in flowering plants with a diagram.
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Model answer · fertilisation in flowering plants
1. 1.After pollination the pollen grain lands on the stigma, germinates and forms a pollen tube.1 mark
2. 2.The pollen tube grows through the style to the ovary, enters the ovule through the micropyle and releases two male gametes into the embryo sac.1 mark
3. 3.One male gamete fuses with the egg cell to form the zygote, and the other fuses with the polar nuclei to form the endosperm nucleus — double fertilisation.1 mark
4. 4.After fertilisation the zygote develops into the embryo, the ovule into the seed and the ovary into the fruit.0.5 marks
5. 5.Diagram: a longitudinal section of the pistil with a pollen grain on the stigma and a pollen tube growing through the style to an ovule in the ovary; label stigma, style, ovary, pollen tube, ovule, male gamete and egg cell.1.5 marks
Diagram: Draw the longitudinal section of a flower/ovary showing a pollen grain germinating on the stigma with a pollen tube growing down through the style into the ovary and entering an ovule to reach the egg cell; label: stigma, pollen grain, pollen tube, style, ovary, ovule, egg cell (female gamete), male germ-cell, zygote.
Marks split from a structure derived from past papers (checked twice); not Bihar Board’s official scheme
Q3Long answer5 marksAsked: 2021
Define pollination. Describe the effect of rainfall on pollination.
Medha Ma’am
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Model answer · pollination, effect of rainfall
1. 1.Pollination is the process of transfer of pollen grains from the anther to the stigma. The stamen is the male reproductive part of the flower and produces pollen grains, while the carpel is the female reproductive part whose terminal part, the stigma, receives the pollen. If this transfer of pollen occurs in the same flower, it is referred to as self-pollination, and if the pollen is transferred from one flower to another, it is known as cross-pollination. This transfer of pollen from one flower to another is achieved by agents like wind, water or animals.2 marks
2. 2.Rain washes away pollen grains or makes them wet and heavy, so that they cannot be carried by the agents like wind, water or animals that normally bring about this transfer of pollen. Since the pollen grains become wet and heavy due to rain, their dispersal by wind or insects is prevented, and they cannot reach the stigma of another flower.1.5 marks
3. 3.Because rain prevents the proper dispersal of pollen grains, it reduces the rate of pollination. As pollination is necessary before the pollen tube can grow through the style to reach the ovary and bring about fertilisation, a reduced rate of pollination due to rain hinders the process of fertilisation, which in turn affects the formation of zygote, seed and fruit.1.5 marks
- Begin by writing the exact definition: 'the process of transfer of pollen grains from the anther to the stigma is called pollination.'
- State clearly that rain makes pollen grains wet and heavy, which prevents their dispersal by wind or insects.
- End by linking reduced pollination caused by rain to hindrance in the process of fertilisation.
Marks split from a structure derived from past papers (checked twice); not Bihar Board’s official scheme
Q4Short answer2 marksAsked: 2021
What is the significance of sexual reproduction?
How the model answer begins
1. Sexual reproduction leads to the generation of variations in the offspring. The DNA copying mechanism cannot be absolutely accurate, and the resultant errors are a source of variations in populations of organisms.
The full answer from Medha Ma’am →
Q5Short answer2 marksAsked: 2021
Write about contraceptive tablets.
How the model answer begins
1. Contraceptive pills act by changing the hormonal balance of the body so that eggs are not released, and fertilisation cannot occur. These drugs commonly need to be taken orally as pills. Since they change hormonal…
The full answer from Medha Ma’am →
Q6Short answer2 marksAsked: 2024
Write the importance of reproduction in living beings.
How the model answer begins
1. Reproduction is important because it allows organisms to maintain the continuity of their species. Populations of organisms fill well-defined places, or niches, in the ecosystem, using their ability to reproduce.…
The full answer from Medha Ma’am →
Q7Short answer2 marksAsked: 2025
What is pollination ?
Q8Short answer2 marksAsked: 2025
What is the difference between menarche and menopause?
How the model answer begins
1. Menarche is the first menstrual cycle that occurs in girls during puberty. At this time, girls begin to menstruate as the body undergoes sexual maturation.
The full answer from Medha Ma’am →
Q9Short answer2 marksAsked: 2026
What is the difference between budding and fragmentation ?
How the model answer begins
1. In budding, a bud develops as an outgrowth on the parent body due to repeated cell division at one specific site. This bud develops into a tiny individual and when fully mature, detaches from the parent body to become a…
The full answer from Medha Ma’am →
Q10Short answer2 marksAsked: 2026
What is the difference between self-pollination and cross-pollination ?
How the model answer begins
1. Self-pollination is the transfer of pollen grains from the anther to the stigma of the same flower or another flower of the same plant.
The full answer from Medha Ma’am →
Q11Short answer2 marksAsked: 2023
What is the function of umbilical cord ?
How the model answer begins
1. The umbilical cord provides nutrition and oxygen to the fetus from the mother's blood. This happens with the help of a special tissue called placenta, which gives a large surface area for glucose and oxygen to pass from…
The full answer from Medha Ma’am →
Q12Short answer2 marksAsked: 2022
Describe the accessory organs of a typical flower.
How the model answer begins
1. The accessory organs of a flower are the calyx and corolla which do not directly participate in reproduction. The calyx is the outermost whorl made up of sepals and the corolla is the whorl made up of petals, lying…
The full answer from Medha Ma’am →
Q13Short answer2 marksAsked: 2022
What is vegetative reproduction ?
How the model answer begins
1. Vegetative reproduction or vegetative propagation is the process of producing new plants from vegetative parts of the plant body like root, stem, or leaf.
The full answer from Medha Ma’am →
Q14Short answer2 marksAsked: 2022
What are the different methods of contraception ?
How the model answer begins
1. Barrier methods of contraception are the creation of a mechanical barrier so that sperm does not reach the egg. Condoms worn on the penis or similar coverings worn in the vagina can serve this purpose.
The full answer from Medha Ma’am →
Q15Short answer2 marksAsked: 2021
What is the process of regeneration?
How the model answer begins
1. Regeneration is the process in which an organism develops a complete individual from its cut or damaged body parts. If the individual is somehow cut or broken up into many pieces, many of these pieces grow into separate…
The full answer from Medha Ma’am →
Q16Short answer2 marksAsked: 2021
Write the names of sexually transmitted diseases in human being.
How the model answer begins
1. The sexually transmitted diseases in human beings include bacterial infections such as gonorrhoea and syphilis, and viral infections such as warts and HIV-AIDS.
The full answer from Medha Ma’am →
Q17Short answer2 marksAsked: 2021
Write two differences between binary fission and multiple fission.
How the model answer begins
1. In binary fission the parent's nucleus divides into two to form two daughter organisms; in multiple fission it divides into many parts to form many daughter organisms at once.
The full answer from Medha Ma’am →
Q18Short answer2 marksAsked: 2025
What is pollination ?

Objective questions with the board’s key (10)

1. Bihar Board 2026
The appearance of the first menstruation is called
- (A) Menopause
- (B) Menarche ✓
- (C) Menstrual cycle
- (D) None of these
Answer: (B)
2. Bihar Board 2026
The method of asexual reproduction is
- (A) Sporulation
- (B) Budding
- (C) Fission
- (D) All of these ✓
Answer: (D)
3. Bihar Board 2026
The development of the embryo takes place in
- (A) Ovary
- (B) Vagina
- (C) Uterus ✓
- (D) Fallopian tube
Answer: (C)
4. Bihar Board 2026
In which of the following does binary fission occur?
- (A) Amoeba
- (B) Paramoecium
- (C) Euglena
- (D) All of these ✓
Answer: (D)
5. Bihar Board 2026
Which of the following is a sexually transmitted disease?
- (A) AIDS
- (B) Gonorrhoea
- (C) Typhoid
- (D) Both (A) and (B) ✓
Answer: (D)
6. Bihar Board 2026
The seed develops from
- (A) Ovule ✓
- (B) Anther
- (C) Ovary
- (D) Stamen
Answer: (A)
7. Bihar Board 2025
An example of vegetative propagation through leaves is
- (A) Onion
- (B) Potato
- (C) Rose
- (D) Bryophylum ✓
Answer: (D)
8. Bihar Board 2025
Changes occurring in adolescence are called
- (A) Diversity
- (B) Germination
- (C) Puberty ✓
- (D) None of these
Answer: (C)
9. Bihar Board 2025
Which of the following is an effective measure used in family planning?
- (A) Diaphragm
- (B) Condom
- (C) Copper T and loop
- (D) All of these ✓
Answer: (D)
10. Bihar Board 2025
At what stage of foetus does safe abortion occur?
- (A) Blastula ✓
- (B) Organ formation
- (C) Mature embryo
- (D) None of these
Answer: (A)

Questions parents and students ask

How many marks does "How do Organisms Reproduce?" carry in Bihar Board Class 10 Science?: In the Bihar Board papers of 2021–2026, this chapter carried about 5 marks and about 6 questions a year; by marks it ranks 8 in Science.
Which are the most important (VVI) questions of "How do Organisms Reproduce?"?: The 18 questions above are from the board’s real papers, each with the years it was asked; the most-asked come first with their full model answers. All 18 written questions of this chapter, with answers, are in the AskMedha app.
Do the answers follow the board’s marking scheme?: BSEB does not publish a marking scheme. Each answer is written point by point on a structure derived from past papers and checked by a second, independent model; it is never called the board’s official scheme.

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