Descriptive Questions on Reproductive System Class 10 Concise ICSE Biology Selina Solutions Ch-13. In this article you will get the solutions / answer of Descriptive Questions / Problems. Visit official website CISCE for detail information about ICSE Board Class-10 Biology.
Descriptive Questions on Reproductive System Class 10 Concise ICSE Biology Selina Solutions Ch-13
| Board | ICSE |
| Subject | Biology |
| Class | 10 |
| Book | Selina Concise |
| Chapter-13 | Reproductive System |
| Topics | Solutions of Descriptive Ans Type Questions |
Answer / Solutions of Descriptive Questions / Problems on Reproductive System of Human
Que-1: Define the following terms:
(a) Reproduction
(b) Hernia
(c) Ovulation
(d) Puberty
(e) Fertilization
(f) Hymen
Ans:
(a) Reproduction : Reproduction is the process of formation of new individuals by sexual or asexual means, which can repeat the process in their own turn.
(b) Hernia : Hernia is an abnormal condition which is caused when the intestine due to the pressure in abdomen bulges into the scrotum through the inguinal canal.
(c) Ovulation : Ovulation is the release of the mature ovum by the rupture of the Graafian follicle.
(d) Puberty : Puberty is the period during which immature reproductive system in boys and girls matures and becomes capable of reproduction.
(e) Fertilisation : The fusion of the male gamete (sperm) and the female gamete (ovum) to form a zygote is called fertilisation.
(f) Hymen : Hymen is a thin membrane which partially covers the opening of the vagina in young females.
Que-2: Distinguish between the following pairs:
(a) Spermatogenesis and oogenesis
(b) Implantation and gestation
(c) Pregnancy and parturition
(d) Placenta and umbilical cord
(e) Identical and fraternal twins
(f) Menarche and menopause
Ans:
(a) Differences between spermatogenesis and oogenesis :
| Spermatogenesis | Oogenesis |
| It is the process of production of sperms in seminiferous tubules of testes. | It is the growth process in which an ovum becomes a mature egg. |
(b) Differences between implantation and gestation :
| Implantation | Gestation |
| It is the fixing of the blastocyst to the endometrial lining of the uterus or the wall of the endometrium. | It is the time period of development of the embryo in the uterus. |
(c) Differences between pregnancy and parturition :
| Pregnancy | Parturition |
| It is the state of carrying a developing embryo or a foetus within the female body. | It is the process of giving birth to the young ones at the end of the gestation period. |
(d) Differences between placenta and umbilical cord :
| Placenta | Umbilical cord |
| It is disc-like structure attached to the uterine wall. | It is a cord containing blood vessels which connects the placenta with the foetus. |
(e) Differences between identical and fraternal twins :
| Identical twins | Fraternal twins |
| They are produced from one ovum i.e. one developing zygote splits and grows into two fetuses. | They are produced when two ova get fertilized at a time. |
(f) Differences between menarche and menopause :
| Menarche | Menopause |
| It is the onset of menstruation in a young female at about the age of 13 years. | It is the permanent stoppage of menstruation in females at about the age of 45 years. |
Que-3: What is the significance of the testes being located in the scrotal sacs outside the abdomen? Can there be any abnormal situation regarding their location? If so, what is that and what is the harm caused due to it?
Ans:
Testes are responsible for the production of male gametes i.e. sperms. The normal body temperature does not allow the maturation of the sperms. Being suspended outside the body cavity, the temperature in the scrotal sac is 2 to 3oC which is the suitable temperature for the maturation of the sperms
When it is too hot, the skin of the scrotum loosens so that the testes hang down away from the body. When it is too cold, the skin contracts in a folded manner and draws the testes closer to the body for warmth.
In an abnormal condition, in the embryonic stage, the testes do not descend into the scrotum. It can lead to sterility or incapability to produce sperms.
Que-4: What are the secondary sexual characteristics in the human male and female respectively?
Ans:
Secondary sexual characters in males:
(i) Beard and moustache
(ii) Stronger muscular built
(iii) Deeper voice
Secondary sexual characters in females:
(i) Breasts in females
(ii) Large hips
(iii) High pitched voic
Que-5: What are the accessory reproductive organs?
Ans:
The accessory reproductive organs include all those structures which help in the transfer and meeting of two kinds of sex cells leading to fertilization and growth and development of egg up to the birth of the baby.
For example: uterus in females, penis in males.
Que-6: Differentiate between the primary and accessory reproductive organs.
Ans:
| Primary Reproductive Organs | Accessory Reproductive Organs |
| The primary reproductive organs produce sex cells. | The accessory reproductive organs help in the transfer and meeting of two kinds of sex cells leading to fertilization. |
| The primary reproductive organs do not help in the development of baby. | The accessory organs help in the growth and development of egg up to the birth of baby. |
| Example: Testes in males and ovaries in females. | Example: penis in males, Uterus, vagina in female. |
Que-7: Name and describe very briefly, the stages in the development of human embryo.
Ans: (a) After fertilization zygote is formed inside the fallopian tube.
(b) The zygote then divides repeatedly to form a spherical mass of cells known as ‘Morula’.
(c) The morula then develops into a hollow sphere of cells with a surrounding cellular layer and an inner cell mass projecting from it centrally. This stage is known as the ‘blastocyst’. It implants itself into the uterine wall.
(d) From the blastocyst arises an embryo which is around 3 weeks old. It is a tiny organism that hardly resembles human being.
(e) By the end of 5 weeks, the embryo is with a devalued heart and blood vessels.
(f) By the end of 8 weeks, limbs are developed. This stage is known as ‘foetus’.
(g) At the end of nearly 40 weeks i.e. end of gestation period, the infant is born.
Que-8: Is it correct to say that the testes produce testosterone? Discuss.
Ans: Testosterone is the male reproductive hormone produced by the interstitial cells or the Leydig cells. These cells are located in the testes. They serve as a packing tissue between the coils of the seminiferous tubules. Therefore, it can be said that the testes produce the male hormone testosterone.
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