11: Population- Increasing Numbers And Rising Problems : Icse-x-biology

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11: Population- Increasing Numbers and Rising Problems

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ICSE
Answers for Chapter 11 Population- Increasing Numbers and Rising Problems Class 10 Selina Biology

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Section : A
Exercise A. Multiple Choice Type:

Qstn #1
What was directly responsible for the rapid rise of world population in the twentieth century? (a) Increased food production (b) Better transport facilities (c) Better education and job prospects (d) Use of antibiotics and prophylactic vaccinations
Ans : (d) Use of antibiotics and prophylactic vaccinations

Qstn #2
Birth rate is the number of live births

#2-a
Per 1000 people per year (b) Per 100 people per decade (c) Per 1000 people per decade (d) Per 100 people per year
Ans : Per 1000 people per year
B. Very Short Answer type:

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Section : B

Qstn #1
Give the technical term for the statistical study of human population of a region
Ans : Demography

Qstn #2
Name two surgical techniques (one for the human male and another for the human female) that can be used to prevent pregnancy.
Ans : (i) Tubectomy (For Female)
(ii) Vasectomy (For Male)

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Section : C
C. Short

Qstn #1
Write true (T) or false (F) for the following:

#1-a
Vasectomy is the surgical method of sterilization in human males.......
Ans : True

#1-b
Tubectomy is the placing of a diaphragm on the cervix.
Ans : False

Qstn #2
What is the total world population at present?
Ans : It is approximately 7 billion.

Qstn #3
Define the following terms:

#3-a
Birth rate
Ans : Birth Rate: It is the number of live births per 1000 people of population per year.