How do organisms reproduce Worksheet-9

How do organisms reproduce Worksheet-9

Subjective questions:

61. Name the outermost covering of testis.

62. What is the site of fertilisation in female reproductive tract?

63. What is the site of implantation and development of young one in man?

64. What happens if the ovum is not fertilised?

65. Name the part in the female reproductive tract, which is commonly called 'birth canal'.

66. How do the contraceptive pills prevent conception?

67. Name one sexually transmitted disease caused by virus.

68. What is the function of accessory sex organs?

69. What is gestation period?

70. Where do the sperms attain motility?

71. Mention the location of ovaries.

72. Give specific scientific terms for the following :

(i)     Cessation of menstrual cycle in females.

(ii)    Release of ovum from ovary into body cavity.

73. Write dual purposes served by the urethra.

74. Where does conception occur in human female? What is its other name?

75. What is the actual role of the placenta in the process of embryonic development?

76. State how the copper-T serves as an effective contraceptive device.

77. Name any two government endeavours for controlling the population growth rate.

78. Give one word for each phase :

(i)     A sexually transmitted disease caused by a virus.

(ii)    The reproductive organ cut and ligated for male sterilisation.

(iii)   The biological end of a full term gestation.

(iv)   The type of disease to which Trichomoniasis belongs.

79. What is germination?

80. What does DNA copying mechanism create?

Answer:

61. Scrotum.

62. Fallopian tube.

63. Endometrium of uterus.

64. If the ovum is not fertilised it is discharged along with the next menstrual flow.

65. Vagina.

66. Contraceptive pills contain synthesis hormones resembling estrogen and progesterone which prevent ovulation and monthly shielding of uterine lining through menstrual bleeding.

67. AIDS -Acquired Immuno Deficiency Syndrome.

68. Accessory sex organs help in transportation, nourishment and maturation of gametes.

69. Gestation period is the period between fertilisation of ova and birth of young individual.

70. In the epididymis.

71. Lower part of the abdomen in the upper pelvic cavity.

72. (i) Menopause, (ii) Ovulation.

73. Urethra is the common passage for the release of urine as well as sperms.

74. Fallopian tube. It’s other name is oviduct.

75. Placenta nourishes the growing foetus as well as helps in expelling the foetal waste.

76. Copper-T is placed inside the uterus by the doctor, which prevents implantation in the uterus.

77. National Population Policy and National Health Policy.

78. (i) AIDS (ii) Vasectomy (iii) Parturition (iv) STDs.

79. Germination is the initial stages in the growth of a seed to develop into a seedling under appropriate conditions.

80. DNA copying mechanisms create variations which are useful for ensuring the survival of the species. Modes of sexual reproduction allow for greater variation to be generated.