Class 10 Science Chapter 7
How do Organism Reproduce
Important Questions

Here are some critical Chapter 7 How do Organism Reproduce problems for Class 10 Science. These inquiries are intended to aid students in studying for and performing well on the CBSE Class 10 Science Examination 2023–24. Students can clear up their concerns and be ready for the exams by practising different types of questions. By answering these questions, you'll increase your confidence while also sharpening your problem-solving abilities. 

Introduction

Chapter 7, "How do Organisms Reproduce," in Class 10 Science, explores the fascinating world of reproduction. It delves into the remarkable ability of organisms to generate precise replicas of themselves, emphasizing various modes of reproduction employed by both single and multicellular organisms. This chapter also examines the intricate process of sexual reproduction, shedding light on the mechanisms that facilitate the perpetuation of life across diverse species.

Class 10 How do Organism Reproduce Important Questions and Answers

Q1. In Rhizopus tubular thread like structures bearing sporangia at their tips are called:

Options

(a) Filaments
(b) Rhizoids
(c) Roots
(d) Hyphae

Ans. (d)

Explanation:
Rhizopus is a saprobic fungus that feeds on dead organic materials that have decomposed. Rhizoids, stolons, and unbranched sporangiophores make up its body, which is made up of branching mycelium with three forms of hyphae: rhizoids, stolons, and unbranched sporangiophores.Rhizoids are hyphae that grow downward into the soil and help in water absorption. A stolen hypha is a slender horizontal hypha that aids in an organism's proliferation. Sporangiophores are unbranched tubular hyphae with rounded sporangia at their tips.Asexual reproduction is accomplished by sporangia, which produce non-motile multinucleate spores.

Q2. Which among the following is not the function of testis at puberty?
(i) Formation of germ cells
(ii) Secretion of testosterone
(iii) Development of placenta
(iv) Secretion of oestrogen

Options

(a) (i), (ii)
(b) (i), (iv)
(c) (ii), (iii)
(d) (iii), (iv)

Ans. (d)

Explanation:
Development of the placenta and secretion of oestrogen is not the function of the testes at puberty.

Q3. Answer the following related to AIDS.
Expand AIDS, HIV.

Explanation:
AIDS – Acquired Immunodeficiency Syndrome
HIV – Human Immunodeficiency Virus

Q4. How is the process of pollination different from fertilisation ?

Explanation:
Pollination is the process of transfer of pollen grains from anther to the stigma of pistil. It is carried out by various pollinating agents like water, wind, insects, animals etc., whereas fertilisation is the process of fusion of male gamete with a female gamete to produce a zygote. It occurs in the embryo sac present inside the ovule.

Q5. What is vegetative propagation in plants? Name the plants where it is seen.

Explanation:
Vegetative propagation is a method of asexual reproduction in plants where new plants are produced from vegetative parts of plants like root, stem and leaves. While animals cannot use this method of reproduction, plants can. This method is used to produce new plants by layering or grafting as in rose, jasmine, sugarcane and grapes for agriculture purposes. It has both benefits and some drawbacks. Some examples of vegetative propagation are shown below:
(i) Propagation by buds on leaf margins in Bryophyllum leaf. The buds that develop along the leaf margin fall on the soil and each of them develops into a new plant.  
(ii) A small cutting of a money plant when kept in water in a glass container or in a pot with soil grows into a new plant.
(iii) Buds in potato and ginger can grow into new plants under suitable conditions.
(iv) In sweet potato, the roots bear adventitious buds which can grow into new plants under favourable conditions.

CBSE Class 10 Science Chapter wise Important Questions

Conclusion

oswal.io offers a thorough set of questions for learning the topic in a better way if you're looking to further practise and improve your grasp of the concepts covered in the chapter.

Frequently Asked Questions

Q1:  How do organisms reproduce?

Ans: The organisms reproduce in two ways-

• Sexual, where the fusion of male and female gametes takes place.
• Asexual, where the fusion of male and female gametes does not take place.

Q2: What are the different modes of asexual reproduction?

Ans: The different modes of asexual reproduction include:

• Fission
• Budding
• Fragmentation
• Spore-formation
• Vegetative propagation

Q3: How does sexual reproduction occur in plants?

Ans: Plants reproduce sexually through pollination. In this process, the pollen from the anther of the flower is transferred to the stigma. The fusion of the male and female gametes takes place. A zygote is then formed which gives rise to an embryo. This leads to the formation of seed which gradually turns into a fruit.

Q4: What is budding?

Ans: This is a type of asexual reproduction in which a new organism grows from an outgrowth by cell division. It remains attached to the mother and derives nutrition from it. Once it matures it detaches itself from the mother and grows as an individual organism. This type of reproduction is seen in Hydra.

Q5: When a cell reproduces, what happens to its DNA?

Ans: When a cell reproduces, DNA replication occurs which forms two similar copies of DNA.