Chapter 7: How do Organisms Reproduce? — Online MCQ Test
SCIENCE · Grade 10 · CBSE(NCERT)
Practice Chapter 7: How do Organisms Reproduce? with a free chapter-wise online MCQ test.
This chapter covers: Asexual reproduction Sexual reproduction Binary fission Budding Vegetative propagation Pollination Fertilisation Embryo Puberty Reproductive health.
AI-generated questions from basic to board-exam level, with instant results and explanations.
Chapter 7: How do Organisms Reproduce? — Important Questions & Answers
In Amoeba, reproduction usually takes place by which method?
- A. Binary fission
- B. Budding
- C. Fragmentation
- D. Spore formation
Answer: A. Binary fission
Amoeba is a unicellular organism that divides into two daughter cells by binary fission.
Amoeba is a unicellular organism that divides into two daughter cells by binary fission.
The transfer of pollen grains from the anther to the stigma is called:
- A. Fertilisation
- B. Pollination
- C. Germination
- D. Implantation
Answer: B. Pollination
Pollination is the process in which pollen grains are transferred from the anther to the stigma of a flower.
Pollination is the process in which pollen grains are transferred from the anther to the stigma of a flower.
Which part of the flower produces pollen grains?
- A. Stigma
- B. Style
- C. Anther
- D. Ovary
Answer: C. Anther
The anther is a part of the stamen and produces pollen grains containing male gametes.
The anther is a part of the stamen and produces pollen grains containing male gametes.
The fusion of male and female gametes is known as:
- A. Pollination
- B. Fertilisation
- C. Menstruation
- D. Regeneration
Answer: B. Fertilisation
Fertilisation is the fusion of the male gamete with the female gamete to form a zygote.
Fertilisation is the fusion of the male gamete with the female gamete to form a zygote.
A gardener wants to grow a plant that has the same desirable traits as the parent plant. Which method is most suitable?
- A. Growing from seeds after cross-pollination
- B. Vegetative propagation by cuttings
- C. Allowing random pollination
- D. Using only fertilised ovules
Answer: B. Vegetative propagation by cuttings
Vegetative propagation produces plants genetically similar to the parent, helping maintain desirable traits.
Vegetative propagation produces plants genetically similar to the parent, helping maintain desirable traits.
Which statement correctly compares asexual and sexual reproduction?
- A. Asexual reproduction always involves two parents, while sexual reproduction involves one parent.
- B. Asexual reproduction produces more variation than sexual reproduction.
- C. Sexual reproduction involves fusion of gametes, while asexual reproduction does not.
- D. Sexual reproduction occurs only in unicellular organisms.
Answer: C. Sexual reproduction involves fusion of gametes, while asexual reproduction does not.
Sexual reproduction involves the fusion of male and female gametes, whereas asexual reproduction does not involve gamete fusion.
Sexual reproduction involves the fusion of male and female gametes, whereas asexual reproduction does not involve gamete fusion.
A student observes that a single-celled organism first divides its nucleus many times and then divides its cytoplasm to form many daughter cells at once. Which process is most likely occurring?
- A. Binary fission
- B. Multiple fission
- C. Budding
- D. Regeneration
Answer: B. Multiple fission
In multiple fission, the nucleus divides repeatedly and many daughter cells are produced simultaneously, as seen in Plasmodium.
In multiple fission, the nucleus divides repeatedly and many daughter cells are produced simultaneously, as seen in Plasmodium.
Which sequence correctly represents events after pollination in a flowering plant?
- A. Pollen tube formation → fertilisation → zygote formation → seed formation
- B. Fertilisation → pollination → pollen tube formation → seed formation
- C. Seed formation → pollination → fertilisation → zygote formation
- D. Zygote formation → pollination → pollen tube formation → fertilisation
Answer: A. Pollen tube formation → fertilisation → zygote formation → seed formation
After pollination, a pollen tube grows through the style, male gametes reach the ovule, fertilisation occurs, and the ovule develops into a seed.
After pollination, a pollen tube grows through the style, male gametes reach the ovule, fertilisation occurs, and the ovule develops into a seed.
A plant produced by vegetative propagation and a plant produced by sexual reproduction are compared. Which statement is most accurate?
- A. Vegetatively propagated plants are usually genetically similar to the parent, while sexually produced plants may show more variation.
- B. Vegetatively propagated plants always have more variation than sexually produced plants.
- C. Sexually produced plants never contain DNA from parents.
- D. Both methods always produce genetically identical offspring.
Answer: A. Vegetatively propagated plants are usually genetically similar to the parent, while sexually produced plants may show more variation.
Vegetative propagation is asexual and generally produces clones, while sexual reproduction creates variation through fusion of gametes.
Vegetative propagation is asexual and generally produces clones, while sexual reproduction creates variation through fusion of gametes.
In a flowering plant, pollen grains reach the stigma successfully, but the pollen tube fails to grow. Which process will be directly prevented?
- A. Transfer of pollen to stigma
- B. Movement of male gamete to the ovule
- C. Formation of petals
- D. Development of anther
Answer: B. Movement of male gamete to the ovule
The pollen tube carries male gametes from the stigma through the style to the ovule; without it, fertilisation cannot occur.
The pollen tube carries male gametes from the stigma through the style to the ovule; without it, fertilisation cannot occur.