Reproduction give rise to more organism with the same basic characteristics as their parents. (b) Mention the changes a flower undergoes after fertilisation. asexual and sexual reproduction. The production of a new organism from a single parent without the involvement of sex cells is called asexual reproduction. Stamen (2016 D) The bud may be unicellular or multicellular formed by mitotic division of its cells. This presents the sperms from coming out. 1. to make male sex cells (or male gametes) called sperms. Roots such as a corm, stem tuber, rhizomes and stolon undergo vegetative propagation. When a girl reaches puberty,then one follicle develops at a time to form mature egg. Kerala Syllabus 9th Standard Physics Solutions Guide, Kerala Syllabus 9th Standard Biology Solutions Guide, Class 10 Science Chapter 8 Important Questions with Answers How do Organisms Reproduce, How do Organisms Reproduce Class 10 Important Questions Very Short Answer Type, How do Organisms Reproduce Class 10 Important Questions Short Answer Type I, How do Organisms Reproduce Class 10 Important Questions Short Answer Type II, How do Organisms Reproduce Class 10 Important Questions Long Answer Type, Ekarthak Shabd in Hindi | एकार्थक शब्द की परिभाषा एवं उनके भेद और उदाहरण (हिन्दी व्याकरण), Tatsam Tadbhav Shabd in Hindi | तत्सम तद्भव शब्द की परिभाषा एवं उनके भेद और उदाहरण (हिन्दी व्याकरण), Shabd Vichar in Hindi | शब्द विचार की परिभाषा एवं उनके भेद और उदाहरण (हिन्दी व्याकरण), Kriya Visheshan in Hindi | क्रिया विशेषण की परिभाषा एवं उनके भेद और उदाहरण (हिन्दी व्याकरण), Paryayvachi Shabd in Hindi | पर्यायवाची शब्द की परिभाषा एवं उनके भेद और उदाहरण (हिन्दी व्याकरण), Anek Shabdon Ke Liye Ek Shabd in Hindi | अनेक शब्दों के लिए एक शब्द की परिभाषा एवं उनके भेद और उदाहरण (हिन्दी व्याकरण), Chhand in Hindi | छन्द की परिभाषा एवं उनके भेद और उदाहरण (हिन्दी व्याकरण), Anekarthi Shabd in Hindi | एकार्थक शब्द की परिभाषा एवं उनके भेद और उदाहरण (हिन्दी व्याकरण), Vilom Shabd in Hindi | विलोम शब्द (Antonyms) की परिभाषा एवं उनके भेद और उदाहरण (हिन्दी व्याकरण), Samvaad Lekhn in Hindi(Dialogue Letter)-संवाद-लेखन, Vismayadibodhak in Hindi | विस्मयादिबोधक (Interjection) की परिभाषा एवं उनके भेद और उदाहरण (हिन्दी व्याकरण), Samuchchay Bodhak in Hindi | समुच्चयबोधक (Conjunction) की परिभाषा एवं उनके भेद और उदाहरण (हिन्दी व्याकरण), Sambandh Bodhak in Hindi | संबंधबोधक (Preposition) की परिभाषा एवं उनके भेद और उदाहरण (हिन्दी व्याकरण), Patra lekhan in Hindi – पत्र-लेखन (Letter-Writing) – Hindi Grammar, हिन्दी निबंध – Essay in Hindi Writing- Hindi Nibandh. The process by which a living being produces its own like is called reproduction. The process of reproduction ensure continuity of life on earth. Reproduction is the process that helps in the growth of population of an organism. Meiosis happens during gamete formation; which is an important step of sexual reproduction.
In order to help students compare their answers to the sample responses, detailed solutions are provided to the NCERT textbook questions.
Plants grown by vegetative propagation grow much faster than those grown from seeds. The organisms produced by asexual reproduction are less diverse in nature.
It detaches from parent body upon maturation and develops into new individual. Answer:
In most of the cases in simple organisms, the parent generation ceases to exist after asexual reproduction. Reproductive health should be maintained in order to prevent sexually transmitted diseases (STDs). So a small family is a happy family. This type of reproduction is practised widely by unicellular organisms. Apart from being important for a particular individual, reproduction is also important for the whole ecosystem. Answer:
These organisms reproduce by binary fission; especially when conditions are favourable, i.e. Question 7. List any four methods of contraception used by humans. Example: Hydra. Name the part of Bryophyllum where the buds are produced for vegetative propagation. (2011 D) The other parts of flower like sepals, petals, stamens, stigma and style dry up and fall off. What are those organisms called which bear both the sex organs in the same individual? Plant parts are detached from the parent & form a new plant. It is the main feature of life on earth. Highly experienced professionals … Answer: The embryo gets nutrition from the mother’s blood with the help of a special tissue called placenta. (b) Explain why more variations are observed in the offsprings of sexually reproducing organisms? Name the parts A, B and C shown in the following diagram and state one function of each. Cross pollination. → The lining of the uterus becomes thick and spongy, required to support the embryo.
(a) List three distinguishing features between sexual and asexual types of reproduction. (i) that produces eggs – Ovary
Fragmentation: Reproduction by fragmentation is seen in filamentous algae, e.g. → Sexual maturation: The period of life when production of germ cells i.e. Pollination is done by insects, birds, wind and water. Artificial vegetative propagation has also helped in developing many new varieties of plants. Question 21. List four advantages of vegetative propagation. Distinguish between unisexual and bisexual flowers giving one example of each. Hydra reproduces by budding which is an asexual type of reproduction.
→ Receives the egg produced by the ovary and transfer it to the uterus. Fission: Question 23. → The time period from fertilization upto the birth of the baby is called gestation period. (b) Write the site of fertilization and the part where the zygote gets implanted in the human female. (2013 D, OD) When the pollen grains from the anther of a flower on one plant are transferred to the stigma of a flower on another similar plant, it is called cross pollination. This bud then grows gradually to form a small hydra. Question 19. And finally, the tiny new hydra detaches itself from the body of the parent hydra and lives as a separate organism. If you're seeing this message, it means we're having trouble loading external resources on our website.
The process of getting back a full organism from its body parts is called regeneration.
b)If the egg does not fertilised by sperm,the thick and soft uterus lining having blood vessels is not required.The unfertilised egg dies within a day and uterus lining also break down.
Answer: (b) (i) Fertilisation takes place in fallopian tube (oviduct). → Zygote divides to form embryo. (iv) ‘D’ ⇒ Fertilised egg or Zygote (b) How is regeneration different from reproduction? → If organism is somehow cut or broken into many pieces, each piece grows into a complete organism. → Many diseases can be sexually transmitted such as: → Use of condom prevents these infections to some extent.
The function of testosterone hormone is to control the development of male sex organs and male features such as deeper voice, moustache, beard and more body hair during male puberty. Three different methods of contraception: We hope the given CBSE Class 10 Science Notes Chapter 8 How do Organisms Reproduce Pdf free download will help you. If you have any query regarding NCERT Class 10 Science Notes Chapter 8 How do Organisms Reproduce, drop a comment below and we will get back to you at the earliest. Only the ovary is left behind. After fertilisation, zygote is formed which develops into an embryo. Question 14. This is a disc which is embedded in the uterine wall. Fertilization can be external or internal. Answer:
Thus, the parent hydra produces a new hydra.
Explain in brief. In sexual reproduction, male and female gametes are formed to produce an offspring. Answer: The students should practice these Question
2. Name a multicellular organism which reproduces by this method. Artificial Vegetative Propagation: Man has used artificial vegetative propagation to grow many plants. (b) Mention the role of gamete and zygote in sexually reproducing organisms.
During this type of reproduction, a bulb like projection arises from the parent body which is known as bud. (b) Explain the structure and the function of the structures released from the ‘blobs’ in Rhizopus. (2015 OD) sponges and Hydra). (2015 OD) Reproduction involves DNA copying which is the source of information for making proteins thereby controlling body design. How does it occur in plants?
(b) What is regeneration in organisms?
What are sexually transmitted diseases? Tuber of Potato: The potato tuber is a modified stem. Fertilisation occurs in plants as well as in animals. Question 11.
Explanation: If the body of planaria gets cut into a number of pieces, then each body piece can regenerate into a complete planaria by growing all the missing parts. Explanation: If the body of planaria gets cut into a number of pieces, then each body piece can regenerate into a complete planaria by growing all the missing parts. It prevents the egg to reach the uterus. Draw diagrams to explain the regeneration that takes place in each of the body parts of planaria when its body is cut into three pieces. (a) Leishmania and Plasmodium reproduce by fission (asexual mode of reproduction). We all are aware of the fact that how races of species are continued .we have seen in … Explain how the embryo gets nourishment inside the mother’s body. Answer: The parent generation ceases to exist, after binary fission. Answer: This category of contraceptives acts by changing the hormonal balance of the body so that eggs are not released and fertilisation cannot occur. → Uterus opens into vagina through cervix. adequate amount of food and moisture is available. (2011 OD) → This lining breaks and comes out through vagina as blood and mucus. On the mother’s side are blood spaces, which surround the villi.
This will make the parents as well as children happy. Answer: List six specific characteristics of sexual reproduction. During gamete formation meiosis occurs. (a) Fragmentation: It occurs in multicellular organisms with relatively simple body organisation, for example, in spirogyra (an algae plant). The flowers which contain both the sex organs, stamen as well as carpel are called bisexual flowers. To secrete female hormones estrogen and progesterone. The daughter nuclei; in turn; grow into new individuals. Answer: Question 10.
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