Significance of reproductive health in the society: (i) Prevention of STDs, (ii) Advantage of small family, (lii) Less mortality among newborns, (iv) Reduces the cases of maternal mortality. Related areas which have improved over the last 50 years: - Family Planning - Decrease in STD cases
Significance of reproductive health in the society:
(i) Prevention of STDs,
(ii) Advantage of small family,
(lii) Less mortality among newborns,
(iv) Reduces the cases of maternal mortality.
Related areas which have improved over the last 50 years:
– Family Planning
– Decrease in STD cases
Chromosomes: These are thread-like structures made up of DNA found in the nucleus. The original number of chromosomes becomes half during gamete formation. Hence, when the gametes combine, the original number of chromosomes gets restored in the progeny.
Chromosomes: These are thread-like structures made up of DNA found in the nucleus. The original number of chromosomes becomes half during gamete formation. Hence, when the gametes combine, the original number of chromosomes gets restored in the progeny.
Specific characteristics of sexual reproduction: (l) Two partners are involved. (ii) Two dissimilar gametes are formed, gamete formation involves meiosis. (lii) Variations are produced. (iv) It occurs in all the higher and some of the lower organisms. (v) Fertilization/fusion of gametes leads to zygRead more
Specific characteristics of sexual reproduction:
(l) Two partners are involved.
(ii) Two dissimilar gametes are formed, gamete formation involves meiosis.
(lii) Variations are produced.
(iv) It occurs in all the higher and some of the lower organisms.
(v) Fertilization/fusion of gametes leads to zygote formation.
(vi) It is comparatively a slow process.
(vii) Each partner produces gamete – sperms (male) .
(viii) Ova or egg (Female).
Electronic configuration of element with atomic number 16 is 2, 8, 6. Since it has 3 shells, the period number will be 3. Since the number of valence electrons is 6, the group number will be 10 + 6 = 16. Valency of the element will be 8 - valence electrons, i.e. 8 - 6 = 2.
Electronic configuration of element with atomic number 16 is 2, 8, 6.
Since it has 3 shells, the period number will be 3.
Since the number of valence electrons is 6, the group number will be 10 + 6 = 16.
Valency of the element will be 8 – valence electrons, i.e. 8 – 6 = 2.
test 1 (Litmus Test): Take two strips of blue litmus paper. place a drop each of the alcohol and carboxylic acid on these strips separately. The blue litmus paper turns red in the case of carboxylic acid and remains unaffected in the case of alcohol. Test 2 (Sodium Hydrogen Carbonate Test/Sodium CarRead more
test 1 (Litmus Test): Take two strips of blue litmus paper. place a drop each of the alcohol and carboxylic acid on these strips separately. The blue litmus paper turns red in the case of carboxylic acid and remains unaffected in the case of alcohol.
Test 2 (Sodium Hydrogen Carbonate Test/Sodium Carbonate Test): A pinch of sodium hydrogen carbonate or sodium carbonate is added separately in both. If brick effervescence with the evolution of a colorless gas is observed, it indicates the presence of carboxylic acid. If no change is observed, it confirms the presence of alcohol.
Test 3 (Ester Test) or any other suitable test.
List four points of significance of reproductive health in a society. Name any two areas related to reproductive health which have improved over the past 50 years in our country.
Significance of reproductive health in the society: (i) Prevention of STDs, (ii) Advantage of small family, (lii) Less mortality among newborns, (iv) Reduces the cases of maternal mortality. Related areas which have improved over the last 50 years: - Family Planning - Decrease in STD cases
Significance of reproductive health in the society:
See less(i) Prevention of STDs,
(ii) Advantage of small family,
(lii) Less mortality among newborns,
(iv) Reduces the cases of maternal mortality.
Related areas which have improved over the last 50 years:
– Family Planning
– Decrease in STD cases
What are chromosomes? Explain how in sexually reproducing organisms the number of chromosomes in the progeny is maintained.
Chromosomes: These are thread-like structures made up of DNA found in the nucleus. The original number of chromosomes becomes half during gamete formation. Hence, when the gametes combine, the original number of chromosomes gets restored in the progeny.
Chromosomes: These are thread-like structures made up of DNA found in the nucleus. The original number of chromosomes becomes half during gamete formation. Hence, when the gametes combine, the original number of chromosomes gets restored in the progeny.
See lessList six specific characteristics of sexual reproduction.
Specific characteristics of sexual reproduction: (l) Two partners are involved. (ii) Two dissimilar gametes are formed, gamete formation involves meiosis. (lii) Variations are produced. (iv) It occurs in all the higher and some of the lower organisms. (v) Fertilization/fusion of gametes leads to zygRead more
Specific characteristics of sexual reproduction:
See less(l) Two partners are involved.
(ii) Two dissimilar gametes are formed, gamete formation involves meiosis.
(lii) Variations are produced.
(iv) It occurs in all the higher and some of the lower organisms.
(v) Fertilization/fusion of gametes leads to zygote formation.
(vi) It is comparatively a slow process.
(vii) Each partner produces gamete – sperms (male) .
(viii) Ova or egg (Female).
Taking the example of an element of atomic number 16, explain how the electronic configuration of the atom of an element relates to its position in the modern periodic table and how valency of an element is calculated on the basis of its atomic numb
Electronic configuration of element with atomic number 16 is 2, 8, 6. Since it has 3 shells, the period number will be 3. Since the number of valence electrons is 6, the group number will be 10 + 6 = 16. Valency of the element will be 8 - valence electrons, i.e. 8 - 6 = 2.
Electronic configuration of element with atomic number 16 is 2, 8, 6.
See lessSince it has 3 shells, the period number will be 3.
Since the number of valence electrons is 6, the group number will be 10 + 6 = 16.
Valency of the element will be 8 – valence electrons, i.e. 8 – 6 = 2.
List two tests for experimentally distinguishing between an alcohol and a carboxylic acid and describe how these tests are performed.
test 1 (Litmus Test): Take two strips of blue litmus paper. place a drop each of the alcohol and carboxylic acid on these strips separately. The blue litmus paper turns red in the case of carboxylic acid and remains unaffected in the case of alcohol. Test 2 (Sodium Hydrogen Carbonate Test/Sodium CarRead more
test 1 (Litmus Test): Take two strips of blue litmus paper. place a drop each of the alcohol and carboxylic acid on these strips separately. The blue litmus paper turns red in the case of carboxylic acid and remains unaffected in the case of alcohol.
See lessTest 2 (Sodium Hydrogen Carbonate Test/Sodium Carbonate Test): A pinch of sodium hydrogen carbonate or sodium carbonate is added separately in both. If brick effervescence with the evolution of a colorless gas is observed, it indicates the presence of carboxylic acid. If no change is observed, it confirms the presence of alcohol.
Test 3 (Ester Test) or any other suitable test.