Class 10 · Science · Chapter 7: How do Organisms Reproduce?
Bihar Board · NCERT · CBSE
Only board questions that already carry a verified year are listed — BSEB annual exam questions (previous years) and questions from the board's official model set (marked separately, not an annual exam). No year is guessed. Answers are written by Study With Me, not an official answer key.
← Chapter 7: How do Organisms Reproduce? — full notes, video, questions
Self-pollination occurs in which of the following plants?
Correct answer: (B) Bisexual
In self-pollination pollen reaches the stigma of the same flower, so the flower must have both stamens and pistil — a bisexual flower such as hibiscus or mustard (lesson 7). It cannot happen in a unisexual flower like papaya.
In which part of the uterus does the embryo develop?
Correct answer: (A) Endometrium (inner lining)
The zygote divides to form an embryo, which is implanted in the thick, blood-rich inner lining of the uterus (endometrium) and grows there; the placenta also forms there (lesson 8).
Which of the following parts is found only in the male genitalia?
Correct answer: (D) Vas deferens
The vas deferens carries sperms from the testis towards the urethra — a part of the male reproductive system. The other three belong to the female system (lesson 8). This is also NCERT exercise Q2.
By which method does reproduction take place in Hydra?
Correct answer: (B) Budding
The book says Hydra forms a bud by repeated cell division at one specific site; the bud grows into a tiny Hydra and detaches — budding (lesson 4). Hydra can also regenerate, but binary fission is the method of Amoeba.
The male reproductive organ of a flower is the—
Correct answer: (A) Stamen
The stamen is the male part and makes pollen grains. The stigma is the tip of the pistil (female part); petals only attract (lesson 7).
Sperm is produced in the—
Correct answer: (D) Testis
Sperms are formed in the testes, which lie outside the abdominal cavity in the scrotum because sperm formation needs a temperature lower than the body temperature (lesson 8). Eggs are formed in the ovaries.
Write any five differences between sexual and asexual reproduction.
| Sexual reproduction | Asexual reproduction |
|---|---|
| two parents (male and female) take part | a single parent is enough |
| male and female gametes are formed | no gametes are formed |
| fertilisation takes place, a zygote forms | no fertilisation |
| gametes are made by meiosis (half the DNA) | only ordinary cell division |
| more variation in offspring — helps the species survive | offspring almost like the parent, very little variation |
| slower, takes more time | faster, many offspring in a short time |
| examples: humans, flowering plants | examples: Amoeba (fission), yeast and Hydra (budding), Rhizopus (spores) |
👉 Any five of these differences earn full marks (lessons 1–8).
← Chapter 7: How do Organisms Reproduce? — full notes, video, questions
