plz. C@n any1 snd me the solved exercise of chapter reproductive system class 10 bio...ICSE of SELINA......which is given at the chapter ending
Answers
Solution A.1
(d) Epididymis - vas deferens - urethra
Solution A.2
(d) 28 days
Solution A.3
(d) About seven days
Solution B.1
(a) Scrotum
(b) Seminiferous Tubules
(c) GraafianFollicle
(d) Seminal vesicle
(e) Epididymis
Solution B.2
(a) Testosterone
(b) Ureter
(c) Ovum
(d) After birth
Solution B.3
(a) Testes Sperms Sperm duct Semen Penis
(b) Menarche Puberty Reproductive age Menstruals Menopause
(c) Graafian follicle Ostium Fallopian tube Uterus
Solution B.4
Seminiferous tubule Epididymis Vas deferens Penis
Solution C.1
Semen is the mixture of sperms and secretions from seminal vesicles, prostate gland and Cowper's (bulbo-urethral gland).
Solution C.2
(a) Inguinal canal: It is the canal which allows the descent of testes along with their ducts, blood vessels and nerves into the abdomen.
(b) Prostate gland: It is a bilobed structure which surrounds the urethra and pours an alkaline secretion into the semen.
(c) Testis: Testis is a male reproductive organ. There a pair of testes present in a scrotal sac descended outside the body cavity. Testes produce sperms which are the male gametes.
(d) Ovary: Ovary is a female reproductive organ.It produces ova i.e. female gametes.
(e) Oviduct: A pair of oviduct is present on either side of the uterus. Oviduct carries the released ovum from the ovary to the uterus.
Solution C.3
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 voice
Solution C.4
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.
Solution C.5
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.
Solution C.6
Hymen is a thin membrane which partially covers the opening of the vagina in young females.
Solution C.7
(a) Hernia: It is an abnormal condition which is caused when the intestine due to the pressure in abdomen bulges into the scrotum through the inguinal canal.
(b) Ovulation:It is the release of the mature ovum by the rupture of the Graafian follicle.
(c) Puberty:It is the period during which immature reproductive system in boys and girls matures and becomes capable of reproduction.
Solution C.8
Changes in human male:
1. Development of Beard and moustache
2. Voice becomes deeper
Changes in human female:
1. Development of Breasts in females
2. Development of high pitched voice
Solution C.9
(a) Menarche is the onset of menstruation in young females at about 13 years of age whereas menopause is the permanent stoppage of menstruation at about 45 years of age.
(b) Cowper's gland opens into urethra in human males and its secretion serves as a lubricant whereas the prostate gland surrounds the urethra in males and its alkaline secretion neutralizes acid in female's vagina.
(c) Hymen is a thin membrane that partially covers the opening of vagina in young females whereas clitoris is a small erectile structure located in the uppermost angle of vulva in front of the urethral opening.
(d) Uterus is a hollow, pear shaped muscular organ located in the pelvic cavity. It is the site of implantation for the embryo after fertilisation whereas the vagina is the muscular tube extending from the cervix to the outside. At the time of sexual intercourse, the vagina receives the male penis and provides entry for the sperms.
(e) Efferent ducts join to form the epididymis whereas the epididymis is continued by the side of the testes to give rise to the sperm duct or vas deferens.
Solution D.1
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.
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