Ncert 10th Science Solution Hindi Medium Now,Class 10 Maths Ch 7 Ex 7.2 Time,Ncert Solutions Class 10th Exercise 5.2 Ed - PDF 2021
28.01.2021, adminAll the contents on this website are free to use without any login or password. Intext question as well as chapter end exercises question answers are given below updated for academic year Ask your doubts through Discussion Forum and ncert 10th science solution hindi medium now the questions asked by the other users.
DNA found in chromosomes in the nucleus of the cell has the information to create proteins which lead to body design of an organisms. If the organisms are to make exact copies of themselves, the DNA should replicate to make an exact copy of. DNA msdium in the cell with the help of various enzymes and this is accompanied by division of himdi basic unit of every organism, i.
The sexually act is very intimate connection of bodies and thus many diseases can be sexually transmitted. Variations are useful for the survival of species in changed environmental situations.
For example, if a population of reproducing organisms were suited to a particular niche well defined place of abode and if the niche is drastically changed, noow population could be wiped. However, if some variations were to be present in a few individuals in these populations, there would be some chance for them to survive.
Solutipn, if there is a population of bacteria living in temperate waters and if water temperature increases by global warming, most of bacteria would die.
But few a variants resistant to heat would survive and grow. Variation is thus useful for the survival of species over time. The methods used for regulation of child birth are: i Barrier method: In this method physical devices like condoms, cervical cap and diaphragm are used to prevent sperms to reach up hindl the ovum.
These drugs may be a oral pills or b vaginal pills. Oral pills mainly contains hormones and are called oral contraceptives. They disturb hormonal balance so that eggs are not released and fertilised. ICUDs prevents implantation of the fertilized ovum inside the uterus. In males, a small portion of vas deferens and the fallopian tube in female is surgically removed or ligated tied.
It is known as vasectomy in males which prevents release of sperms from the testes. In females, it is called tubectomy. Multi cellular organisms cannot simply ncert 10th science solution hindi medium now cell by cell because: i Many multi cellular organism are not simply a random collection of cells.
Specialised cell are organised as tissues and tissues are organised into organs which are mediuk at a definite position in the body. In such a carefully organised situation, cell by cell ncert 10th science solution hindi medium now for reproduction would be impracticable.
The hidi develops thick and spongy lining to receive fertilised egg. When the egg is not fertilised, uterine lining slowly break Ncert Solutions For Class 10th Science In Hindi Medium Now and comes out as blood and mucous. This cycle takes place roughly every month and is known as menstrual cycle menstruation. Fragmentation: The mode of reproduction of simple multicellular organisms in which body simply breaks up into smaller pieces upon maturity and each piece or ncert 10th science solution hindi medium now grows into a new individual is called fragmentation.
The relatively simple multicellular organisms which are simply a random collection of cells are involved in fragmentation type of reproduction. Example: Spirogyra. Role of seminal vesicle and Prostate gland. Along the path of the vas deferens, these glands add their secretions so that the sperms are now in a fluid which makes their transport easier and this fluid also provides nutrition to sperms.
The transfer of solition grains form anther of stamen to stigma is called pollination. The transfer of pollen from the anther of one flower to the stigma of another flower of a different plant of the same species is called cross pollination.
In this case, pollen grains of the same flower do not pollinate its stigma. In cross pollination, the transfer of pollen grains may take place through some agency like wind, insect, bird, water, mammals. Transfer of pollen from the anther of a flower to the stigma of the same flower or a flower on the same plant is called self pollination.
Question 1: a Name the following: i Thread like non-reproductive structures present in Rhizopus. Yindi 1: a i Ncsrt ii Sporangia b On maturity sporangia ruptures and release spores.
Each spore contains a nucleus and cytoplasm enclosed in a thick wall for protection. Function: Spores disperse far and wide. Each spore grows into new Rhizopus when come in contact of moist surface and other suitable conditions. Question 2: Differentiate between pollen gains and ovule? Answer 2: Pollen grain produces male germs-cell male gamete in the plants.
The ovule contains a female gamete female germ cell or egg. Question 1: Name the plant that reproduces through leaves. List two advantages of this way of reproduction. Answer 1: Bryophyllum Meium i Many buds are produced in the notches along the margin of a single leaf. Each leaf-bud of Bryophyllum produces a plant.
Question 2: Give functions of the following organs of the human male reproductive. It keeps the temperature lower than the normal body temperature that is required for the formation of sperm. Barrier method: In this method, the fertilization of ovum and sperm is prevented with the help of barriers. Barriers are available for both males nncert females. Condoms are barriers made of thin rubber that are used to cover penis in males and vagina in females.
Ncert 10th science solution hindi medium now contraceptives: In this method, tablets or drugs are taken orally. These contain small doses of hormones that prevent the release of eggs and thus fertilization cannot occur.
Implants ncert 10th science solution hindi medium now surgical methods: Contraceptive devices such as the loop or Copper-T are placed in uterus to prevent pregnancy.
Some surgical methods can also be used to block the gamete transfer. It includes the blocking of vas deferens to prevent the transfer of sperms known as vasectomy. Similarly, fallopian tubes of the female can be blocked so that the egg will not reach the uterus known as tubectomy.
Ncert 10th science solution hindi medium now is the importance of DNA copying in reproduction? What are sexually transmitted diseases? Name an STD which damages the immune system of human body. Why is variation beneficial to the species but not necessarily for the individual?
What are the three categories of contraception methods? Write briefly about. Describe menstrual cycle. Define the process of fragmentation in some organisms. Which category of organisms are involved in this process?
Give one example. What is the role of seminal vesicle and the prostate gland? What is pollination? List the modes of pollination and define each of them? Name the plant that reproduces through leaves.
Bryophyllum Advantages: i Many buds are produced in the notches along the margin of a single leaf. How does the process of budding is differ from the process of spore formation? Budding: A bud, as in Hydra, develops as an outgrowth due to replicated cell division at a specific site. These buds when mature detach from the parent body and become new individual. Spore Formation: In spore formation, as in Rhizopus, a specific part called Sporangia that produce spores.
The spores are yindi by thick walls that protect them until a spore gets favourable conditions to grow into a new Rhizopus plant.
What are the advantages of sexual reproduction over asexual reproduction? Advantages of sexual reproduction: In sexual reproduction, more variations are produced. Thus, it ensures survival of species in a population. The new formed individual has characteristics of both mddium parents.
Variations are more viable in sexual mode than in asexual one. This is because in asexual reproduction, DNA has to function inside the inherited cellular apparatus. What are the functions performed by the testis in human beings?
The testes are the male reproductive organs that are located outside the abdominal cavity within a pouch called scrotum. Functions of testes: Produce sperms Produce a hormone called testosterone, which brings about secondary sexual characters in boys. Why does menstruation occur?
Menstruation is a process in which blood and mucous flows out every month through the vagina. This process occurs every month because one egg is released from the ovary every month and at the same time, the uterus womb prepares itself to receive the fertilized egg. Thus, the inner lining of mediuum uterus gets thickened and is supplied with blood to nourish the embryo.
If the egg does not get fertilised, then the lining of the uterus breaks down slowly and gets released in the form of blood and mucous ncert 10th science solution hindi medium now the vagina.
What are the different methods of contraception? The contraceptive methods can be broadly divided into the following types: Natural method: It involves avoiding the chances of meeting of sperms and ovum. In this method, the sexual act is avoided from day 10th to 17th of the menstrual cycle because during this period, ovulation is expected and therefore, the chances of fertilization are very high.
What could be the reasons for ncert 10th science solution hindi medium now contraceptive methods? Contraceptive methods are mainly adopted because of the following reasons: i To prevent unwanted pregnancies.
Update:When my Gran only had white eggs, left as well as right, you had been dry as well as friendly a complete time. A single cause we won't confront is fishing vigour. We might frame off a aged paint, have certain to dry them off.
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