Science
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Chapter 8: How Do Organisms Reproduce?
Class: X
Exercise number 3
Question 1
How is the process of pollination different from fertilization?
Answer 1
Question 2
What is the role of the seminal vesicles and the prostate gland?
Answer 2
The seminal vesicle and prostate gland secretes fluid which provides lubrication to the sperms. The fluid medium helps in the easy transportation of sperms. This secretion also provides nutrient in the form of some enzymes, calcium, and fructose.
Question 3
What are the changes seen in girls at the time of puberty?
Answer 3:
Secondary sexual characteristics in girls:
1.Hair growth in the areas like hands, legs, underarms, and face.
2.Hair growth in the genital areas.
3.Darkening of the tips of the nipple area and increase in size of the breast.
4.Increase in size of the Ovary and Uterus.
5.Menstrual cycle starts.
6.Extra secretion of oil from the skin resulting in the appearance of pimples.
Question 4:
How does the embryo get nourishment inside the mother’s body?
Answer 4:
Mother’s body is the home of embryo, during the first nine month of its development. The outer tissue surrounding the embryo develops into finger like projections known as Villi. These Villi surrounded by uterine tissue and maternal blood, provide a large surface area for the exchange of nutrients and oxygen. The embryo receives the nutrients and blood through a special tissue called Placenta, which is connected to the Uterine wall. The waste material produced by the embryo is also removed through the Placenta.
Question 5:
If a woman is using a copper−T, will it help in protecting her from sexually transmitted
diseases?
Answer 5:
No. Copper-T only prevents the entry of semen to the uterus, hence preventing the implantation of embryo in the uterus. Therefore, even if a woman is using copper-T, it will never protect her from sexually transmitted diseases.
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