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What full these kind of consumers wish that a stream marketplace is not for a time being offering?. A skeleton have been essentially minute with transparent directions as well as step-by-step illustrations. This inventory is for Full Dimension Skeleton upon Cd.
Answer: Vegetative propagation makes possible for the propagation 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: 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 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 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 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 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 not a pan Of the female reproductive system in human beings? The anther contains : a Sepals b Ovules c Carpel d Pollen 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 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 are three main methods of contraception :. Barrier methods: In barrier methods, physical devices such as condom, diaphragm and cervical caps are used. They prevent the entry Of sperms in the female genital tract during copulation. Chemical methods: 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 vas deferens in male, and the fallopian tube in female, in surgically removed or ligated tied.
Apart from these three methods the intrauterine 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 to populations Of species? Answer: The rate Of birth and death in a given population determine its stability. The rate of birth 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 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 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 show [NCERT Exemplar] a only similarities with parents b only variations with parents c both similarities and 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 because the offsprings receive some genes from mother and some from father. Because of mixing of genes on re-establishment of the exact 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 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. 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 results in formation of zygote.
Offsprings formed are clones. Clones are identical copy of parent organism. Sexual reproduction needs two type of gametes, i. During adolescence various changes occur in the body of humans. Mark one change associated with sexual maturation in males. Observe the diagram given along side. What happens after the above stage? What in your opinion could be the best reason to explain why menstruation is not taking place in a healthy woman? Because, during gestation period of pregnancy, menstruation does not take place.
Two 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 flower B bears both male and female reproductive parts, therefore it can get fertilised by pollination and can change into fruit.
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 sexual maturity and become capable of reproduction. Menstruation Menstrual cycle is a cyclic event that places roughly every month in females after 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, 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 maintains the continuity of life. From this, the characteristics and features of organisms are transformed to their progeny. It produces variations in organisms which is the basis of evolution of new species. Page Number: Question 1 How is the process of pollination different from fertilisation?
Answer: Binary fission Multiple fission 1. In this an organism divides into two similar organisms. In this an organism produces two or more organisms. A cyst or thick layer is not formed around the cell.
A cyst or thick layer is formed around the cell. It generally occurs in favourable conditions Example : Amoeba, paramecium 3. It can take place in unfavourable conditions too. Example: Malarial parasite. Answer: Pollination Fertilisation 1. The transfer of pollen grains from the anther of a stamen to the stigma of a carpel is called pollination.
Fertilisation occurs when the male gamete present in pollen grain joins with the female gamete or egg present in ovule. It takes place by various pollinating agents. It takes place by natural or artificial means. Answer: The various changes occur in girls at puberty are : Hair grow under armpits and pubic region.
Mammary glands or breasts develop and enlarge. The hips broaden. Extra fat is deposited in various parts of the body like hips and thighs. Fallopian tube, uterus and vagina enlarge. Ovaries start to release eggs. Menstruation monthly periods starts. Feelings and sexual drives associated with adulthood begin to develop. Answer: Question 8 What are the different methods of contraception? Answer: Reproduction mode in unicellular organisms Reproduction mode in multicellular organisms i A sexual reproduction takes place in unicellular organisms.
Answer: The reasons for adopting contraceptive devices are as follow: To control the birth rate and prevent the increase in population. To provide safety from sexually transmitted diseases. In such a carefully organised situation, it is not easy to develoP organism through regeneration Question 4. Answer: d Pollen grains Question 4. Answer: There are three main methods of contraception : Barrier methods, Chemical methods, and Surgical methods.
So, by checking birth rate, which is increasing at an alarming rate, stability to population of species can be provided Question Basic event in reproduction is the creation of a DN A copy.
Cells use chemical reactions to build two copies of the DNA in a reproducing cell. In addition, DNA copying is accompanied by the creation of an additional cellular apparatus. Then each DNA copy is separated with its own cellular apparatus.
Effectively, a cell divides to give rise to two cells. The S. It is denoted by D. Important questions and CBSE previous years board questions related to chapter 10 are given with answers. List four properties of the image formed by a plane mirror. List the four properties of the image formed by a convex mirror.
State the laws of refraction of light. What is meant by refraction of light? Important Questions on 10th Science Chapter 10 Define the principal focus of a concave mirror. Light rays that are parallel to the principal axis of a concave mirror converge at a specific point on its principal axis after reflecting from the mirror.
This point is known as the principal focus of the concave mirror. The radius of curvature of a spherical mirror is 20 cm. What is its focal length? Name the mirror that can give an erect and enlarged image of an object. When an object is placed between the pole and the principal focus of a concave mirror, the image formed is virtual, erect, and enlarged.
Why do we prefer a convex mirror as a rear-view mirror in vehicles? Convex mirrors give a virtual, erect, and diminished image of the objects placed in front of them.
They are preferred as a rear-view mirror in vehicles because they give a wider field of view, which allows the driver to see most of the traffic behind him. A ray of light travelling in air enters obliquely into water.
Does the light ray bend towards the normal or away from the normal? The light ray bends towards the normal. When a ray of light travels from an optically rarer medium to an optically denser medium, it gets bent towards the normal.
Since water is optically denser than air, a ray of light travelling from air into the water will bend towards the normal. The refractive index of diamond is 2. What is the meaning of this statement?
Define 1 dioptre of power of a lens.
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