How do Organisms Reproduce
23 solved questions from Class 10 Science, each with the full working. Tap any question to see the step-by-step solution.
- 1 A certain type of algae reproduces asexually by binary fission. Starting with 5 cells, the population doubles every hour. How many cells will be present after 4 hours? hard 4 marks Binary fission – cell number calculation
- 2 Which of the following is a mode of asexual reproduction observed in hydra? easy MCQ 1 mark Asexual reproduction – budding
- 3 In flowering plants, fertilization occurs when: medium MCQ 2 marks Fertilization in angiosperms
- 4 Starfish can regenerate lost arms. Which asexual reproductive method does this represent? easy MCQ 1 mark Fragmentation
- 5 A culture of yeast contains 20 cells and the number of cells doubles every 30 minutes. How many cells will be present after 2 hours? easy 1 mark Asexual reproduction – growth rate
- 6 Which of the following is an example of biotic pollination? medium MCQ 2 marks Pollination
- 7 A culture of Paramecium contains 500 individuals. The population triples every 45 minutes. How many individuals will be present after 3 hours? medium 3 marks Population growth by tripling
- 8 Describe the process of fertilisation in flowering plants, starting from pollination to formation of the zygote. Include the role of the pollen tube. medium 4 marks Fertilisation in angiosperms
- 9 In the alternation of generations in a fern, which statement is correct? hard MCQ 5 marks Alternation of generations
- 10 Which asexual reproductive method is used by most bacteria? easy MCQ 1 mark Bacterial asexual reproduction
- 11 State two advantages of asexual reproduction in flowering plants. easy 2 marks Advantages of asexual reproduction
- 12 Which of the following agents is biotic and helps in the pollination of apple trees? easy MCQ 1 mark Biotic pollination
- 13 Starfish can regenerate lost arms. This asexual reproductive method is called: hard MCQ 3 marks Asexual reproduction – fragmentation
- 14 In mosses, which generation is dominant and what is its ploidy level? medium 2 marks Dominant generation in mosses
- 15 What is the primary topic or theoretical principle explored in 'How do Organisms Reproduce' (Class 10 SCIENCE)? medium MCQ Chapter Core Principle
- 16 Which key mechanism or analytical rule is highlighted in 'How do Organisms Reproduce'? medium MCQ Key Analytical Mechanism
- 17 In the life cycle of the fern *Pteridium aquilinum*, the gametophyte stage is dominant. What is its ploidy level, and which phase undergoes meiosis? medium 3 marks Alternation of generations ploidy and meiosis
- 18 A culture of Paramecium contains 200 individuals. The population doubles every 20 minutes. How many individuals will be present after 1 hour? easy 1 mark Population growth by exponential doubling
- 19 A fern releases a spore packet containing 50 spores. Each spore has a 20% probability of germinating into a gametophyte. What is the expected number of gametophytes from this packet? medium MCQ 3 marks Expected value in biological reproduction
- 20 A culture of budding yeast starts with 12 cells and doubles every 20 minutes. How many cells will be present after 1 hour? easy 2 marks Binary fission population growth
- 21 A single asexual fruit of a plant produces 200 seeds through a process that does not involve fertilization. If each seed is expected to develop into a mature plant with probability 0.9, what is the expected number of mature plants? easy 1 mark Expected value in asexual reproduction
- 22 A population of bacteria starts with 100 cells and grows by binary fission. If the doubling time is 30 minutes, how many cells will there be after 3 hours? medium 3 marks Exponential growth via binary fission
- 23 In the process of pollen tube growth, which hormone acts as a key attractant directing the tube toward the ovule? hard MCQ 4 marks Hormonal control of pollen tube guidance