From what I might inspect it we would ncert solutions class 10th chapter 8 university to palm qualification each partial to a ship! Way behind to Democrat Boss Frankin Delano Roosevelt, insulting, as well as a compare of Ncert Solutions Class 10th Chapter 8 University a planks is most some-more critical. Your total categorical boat builders operate Lorem lpsum 304 boatplans/fishing-boat/fishing-boat-on-water click here "model ship" process prior Ncert Solutions Class 10th Chapter 8 University to they establish upon a chaptr pattern.
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Exercise 8. In given figure, find tan P Ncert Solutions Class 10th Chapter 8 University � cot R. Determine the values of sin P, cos P and tan P. State whether the following statements are true or Ncert Solutions Class 10th Chapter 8 University Ncert Solutions Class 10th Chapter 8 University false. Justify your answer. Trigonometry is the study of relationships between the sides and angles of a right-angled triangle. Trigonometric ratios of an acute angle in a right triangle express the relationship between the angle and the length of its sides.
Answer: The introduction of variations during reproduction provides stability to the populations of various species by preventing them from getting wiped out during adverse conditions. Reproduction also helps to generate copies of individuals which are suited to a particular environment. Question 11 What could be the reasons Ncert Solutions Class 10th Chapter 8 University for adopting contraceptive methods? Answer: The reasons for adopting contraceptive devices are as follow:.
Reproduction: Reproduction in animals and plants asexual and sexual Ncert Solutions Class 10th Chapter 8 University reproductive health � need and methods of family planning. Formulae Handbook for Class 10 Maths and Science. Page Question 1. What is Ncert Solutions Class 10th Chapter 8 University the importance of DNA copying in reproduction? Answer: DNA copying in reproduction is important for maintenance of body designs and features. Moreover, Ncert Solutions Class 10th Chapter 8 University Ncert Solutions Class 10th Chapter 8 University DNA copying leads to variations. Variation is useful for the survival of species.
Question 2. Why is variation beneficial to the species but not necessarily for the individual? Answer: Population of organisms reside in well-defined places or niches in the ecosystem. However, niches can change because of reasons beyond the control of the organisms, e. If population of reproducing organisms suited to particular niche and if Ncert Solutions Class 10th Chapter 8 University Ncert Solutions Class 10th Chapter 8 University the niche is drastically altered, the population can be wiped out. However, if some variations are present in a few inAividuals in these populations, there will be chances for their survival.
The surviving individual can further reproduce and develop a population according to the changed Ncert Solutions Class 10th Chapter 8 University niche, Thus, variation is beneficial to the species but not necessarily for the individual. Question 1. How does binary fission differ from multiple fission? Answer: When two new daughter cells are formed as a result of fission. It is called binary fission, e.
When Ncert Solutions Class 10th Chapter 8 University Ncert Solutions Class 10th Chapter 8 University Ncert Solutions Class 10th Chapter 8 University many daughter cells are formed as a result of fission, this is called multiple fission, e. How will an organism be benefited Ncert Solutions Class 10th Chapter 8 University if it reproduces through spores? Answer: Spore formation is an asexual mode of reproduction. Spores formed are covered by thick walls that protect them from adverse conditions. During favourable condition thick resistant wall breaks down and new organism grows from it.
Spores are very light Ncert Solutions Class 10th Chapter 8 University Ncert Solutions Class 10th Chapter 8 University weight and they easily get dispersed through winds which give them more variations and thus better chances of survival. Question 3. Can you think of reasons why more complex organisms cannot give rise to new individuals through regeneration?
Answer: Complex organisms are not simply a random collection of cells where sPecialized cells are organised as tissues, and tissues ale organised into organs which then have to Ncert Solutions Class 10th Chapter 8 University be placed at definite positions in the body.
In such a carefully organised situation, it is not easy to develoP organism through Ncert Solutions Class 10th Chapter 8 University regeneration. Question 4. Why is vegetative propagation practised for growing some type of plants? Answer: Vegetative propagation makes possible for the propagation Ncert Solutions Class 10th Chapter 8 University Ncert Solutions Class 10th Chapter 8 University of plants such as banana, orange, rose and jasmine that have lo6t the capacity to Produce seeds. Moreover, all plants produced through vegetative propagation are genetically similar to the parent plant.
Question 5. Why is DNA copying an essential part of the process of reproduction? Answer: Ncert Solutions Class 10th Chapter 8 University The process of reproduction results in the production of off springs which resemble to their parents. This means during the reproduction there must be a transfer of the blueprint of the body design from parent to the off springs. As we know DNA Ncert Solutions Class 10th Chapter 8 University contains all the information that passes from parents to the next generation, so before reproduction, DNA is copied in the parent cell.
Out of these two copies, one copy is passed to the newly formed individual. How is the process Of pollination different from fertilization? Answer: Pollination is the transfer of pollen grains from the anther to the stigma Of a flower whereas fertilization is the fusion Ncert Solutions Class 10th Chapter 8 University Ncert Solutions Class 10th Chapter 8 University Of male gamete with female gamete egg. What is the role of the seminal vesicles and the prostate gland? Answer: Seminal vesicles and the prostate gland add their secretions so that the sperms are in a fluid semen which makes their transport easier and Ncert Solutions Class 10th Chapter 8 University Ncert Solutions Class 10th Chapter 8 University this fluid also provides nutrition.
What are the changes seen in girls at the time Of puberty? Answer: Changes seen in girls at the time of puberty are : 1.
Breast size begins to increase. Girls begin to menstruate. Growth Of pubic hair. Skin becomes Ncert Solutions Class 10th Chapter 8 University oily. Through placenta, glucose and oxygen pass from mother to the embryo. If a woman is using a copper-T will it help in protecting her from sexually transmitted diseases? Answer: No, copper-Twill not protect her from Only Barrier methods protect from sexually transmitted diseases. Asexual reproduction takes place through budding in : a Amoeba b Yeast c Plasmodium d Leishmania. Answer: b Yeast.
Which of the following is Ncert Solutions Class 10th Chapter 8 University Ncert Solutions Class 10th Chapter 8 University not a pan Of the female reproductive system in human beings? The anther contains : a Sepals b Ovules c Carpel d Pollen Ncert Solutions Class 10th Chapter 8 University 10th Class Chapter University Ncert Solutions 8 grains. Answer: d Pollen grains. What are the advantages of sexual reproduction over asexual reproduction? Answer: Sexual reproduction leads to new combination Of genes as it involves two parents and meiosis.
This produces variation in offspring. Variations are the basis for evolution. What are the functions performed by the testes in human beings? Answer: Functions Of testes are. Question 6. Why does menstruation occur? Answer: If the Ncert Solutions Class 10th Chapter 8 University Ncert Solutions Class 10th Chapter 8 University Ncert Solutions Class 10th Chapter 8 University egg is not fertilized and uterus does not get zygote, the developed lining slowly breaks and menstruation occur. Question 7. What are the different methods of contraception?
Answer: There Class 10th Chapter 4 Agriculture Ncert Solutions are three main methods of contraception :. Barrier methods: In barrier methods, physical devices such as Ncert Solutions Class 10th Chapter 8 University condom, diaphragm and cervical caps are used.
They prevent the entry Of sperms in the female genital tract during copulation. Chemical methods: Ncert Solutions Class 10th Chapter 8 University The chemical methods make use of specific drugs by females. There are two types of such drugs, Oral pills and vaginal pills. Oral pills are mainly hormonal preparation, and are called oral contraceptives OCS. Surgical methods: In the surgical methods, a small portion of Ncert Solutions Class 10th Chapter 8 University vas deferens in male, and the fallopian tube in female, in surgically removed or ligated tied. Apart from these three methods the intrauterine Ncert Solutions Class 10th Chapter 8 University Ncert Solutions Class 10th Chapter 8 University contraceptive devices are used to prevent pregnancies.
A copper-T is placed safely inside the uterus by a practising doctor or a skilled nurse. IUCDs prevent implantation in the uterus. Question 8. How are the modes for reproduction different in unicellular and multicellular organisms? Answer: Unicellular organisms reproduce asexually whereas multicellular organisms reproduce manly by n 1 reproduction.
Question 9. How does reproduction help in providing stability Ncert Solutions Class 10th Chapter 8 University to populations Of species? Answer: The rate Of birth and death in a given population determine its stability. The rate of birth Ncert Solutions Class 10th Chapter 8 University Ncert Solutions Class 10th Chapter 8 University should be approximately equal to the rate of death.
So, by checking birth rate, which is increasing at an alarming rate, stability to population of species can be provided. Question What could be the reasons for adopting contraceptive methods? Answer: Frequent pregnancies have an adverse Ncert Solutions Class 10th Chapter 8 University Ncert Solutions Class 10th Chapter 8 University effect on the health of a woman. Frequent and unwanted pregnancies can be avoided by adopting contraceptive methods. Also, these methods check population growth by controlling child birth rate. The ability of a cell to divide into several cells during reproduction in Plasmodium is Ncert Solutions Class 10th Chapter 8 University called [NCERT Exemplar] a budding b reduction division c binary fission d multiple fission Answer: d Multiple fission Organisms divide into many daughter cells simultaneously, e.
It contains pollen grains, having male germ cells. Characters that are transmitted from parents to offspring during reproduction Ncert Solutions Class 10th Chapter 8 University Ncert Solutions Class 10th Chapter 8 University Ncert Solutions Class 10th Chapter 8 University show [NCERT Exemplar] a only similarities with parents b only variations with parents c both similarities and Ncert Solutions Class 10th Maths Chapter 6 Day variations with parents d neither similarities nor variations Answer: c In sexual reproduction, the offsprings are not exactly identical to the parents or to one another.
This is Ncert Solutions Class 10th Chapter 8 University because the offsprings receive some genes from mother and some from father. Because of mixing of genes on re-establishment of the exact Ncert Solutions Class 10th Chapter 8 University Ncert Solutions Class 10th Chapter 8 University number of chromosomes as in the parents, the offsprings show both similarities and variations with their parents. Which among the following diseases is not sexually transmitted?
Hepatitis is a water borne viral disease which affects liver. Which of the following is not a part of the female reproductive system in human beings? A feature of reproduction that is common to Amoeba, Spirogyra and yeast is that [NCERT Exemplar] a they reproduce asexualiy b they are all unicellular c they reproduce only sexually d they are all multicellular Answer: a Amoeba and yeast are unicellular while Spirogyra is multicellular.
But, all the three reproduce asexualiy. Which among the following statements are true Ncert Solutions Class 10th Chapter 8 University for unisexual flowers? They possess both stamen and pistil. They possess either stamen or pistil. They exhibit cross-pollination. Unisexual flowers possessing only stamens cannot produce fruits. Since, only one reproductive organ is present in them, they depend on cross-pollination to form zygote after fertilisation.Ncert Solutions Class 10th Chapter 8 University
Both stamens and carpels are required for fertilisation, so only one of them cannot produce fruits. Answer: b Length of pollen tube depends on the distance between pollen grain on upper surface of stigma and ovule.
A pollen grain falls on the stigma of the carpel, bursts open and develops a pollen tube downwards through the style towards the ovule in the ovary. Which among the following statements arer true for sexual reproduction in flowering plants? It requires two types of gametes. Fertilisation is a compulsory event. It always Chapter 8 University 10th Class Solutions Ncert results in formation of zygote. Offsprings formed are clones. Clones are identical copy of parent organism.
Sexual reproduction needs two type of Ncert Solutions Class 10th Chapter 8 University Ncert Solutions Class 10th Chapter 8 University Ncert Solutions Class 10th Chapter 8 University gametes, i. During adolescence various changes occur in the body of humans. Mark one change associated with sexual maturation in males. Observe Ncert Solutions Class 10th Chapter 8 University the diagram given along side. What happens after the above stage? What in your opinion could be the best reason to explain Ncert Solutions Class 10th Chapter 8 University why menstruation is not taking place in a healthy woman?
Because, during gestation period of pregnancy, menstruation does not take place. Two Ncert Solutions Class 10th Chapter 8 University Ncert Solutions Class 10th Chapter 8 University Ncert Solutions Class 10th Chapter 8 University flowers are identified by a botanist with the following features that flower A is having only stamen and flower B is having both stamen and pistil.
Which of the following statements is correct? Answer: Option c is correct. Since, flower A bears only stamen, i. And Ncert Solutions Class 10th Chapter 8 University flower B bears both male and female reproductive parts, therefore it can get fertilised by pollination and can change into fruit.Ncert Solutions Class 10th Chapter 8 University
It involves the formation and fusion of the gametes. It leads to formation of variations in individuals. Variations form the basis of evolution of the species and ensure the survival of the species. Reproduction in Human Beings Puberty: The period during which adolescents reach Ncert Solutions Class 10th Chapter 8 University sexual maturity and become capable of reproduction.
Menstruation Menstrual cycle is a cyclic event that places roughly every month in females after Ncert Solutions Class 10th Chapter 8 University puberty. Unfertilized egg lives for 1 day after which it degenerates.
This discharge is known as menstruation which lasts for about days. Stamen is the male reproductive part and it produces pollen grains. Carpel is the female reproductive part made up of three parts: ovary, Ncert Solutions Class 10th Chapter 8 University style and stigma.
Hibiscus, mustard. Two types: self-pollination and cross pollination. The ovary grows rapidly and ripens to form a fruit. If you have any query regarding the how do organisms reproduce class 10 notes NCERT solutions, drop it in the comment section below and we will get back to you. Answer: DNA copying has following importance in reproduction: It maintains the characteristics of species.
It Ncert Solutions Class 10th Chapter 8 University Ncert Solutions Class Ncert Solutions Of Class 10th Chemistry Chapter 2 2020 10th Chapter 8 University Ncert Solutions Class 10th Chapter 8 University maintains the continuity of life. From this, the characteristics and features of organisms are transformed to their progeny. It produces variations in Ncert Solutions Class 10th Chapter 8 University organisms which is the basis of evolution of new species. Page Number: Question 1 How is the process of pollination different from fertilisation?
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