Class 10th science notes

NCERT NICHOOD - Most Important Questions with NCERT Line by line Notes

NCERT NICHOOD - Most Important Questions with NCERT Line by line Notes

Based on new 2024-25 syllabus

Last year many questions were directly from this book only so download it fast for this session

PYQ - 5 Marks

Answer 1-
(i) When A magnesium ribbon is burnt in air
2Mg(s) + O2(g) → 2MgO(s): Combination Reaction
(ii) When Limestone is heated
CaCO3(s) → CaO(s) + CO2(g): Thermal Decomposition Reaction
(iii) When Silver bromide is exposed to sunlight
2AgBr(s) → 2Ag(s) + Br2: Photolytic Decomposition Reaction
(iv) When Electricity is passed through acidified water
2H2O(l) → 2H2(g) + O2(g): Electrolytic Decomposition reaction
(v) When Ammonia and hydrogen chloride are mixed with each other.
NH3(g) + HCl(g) → NH4Cl(s): Combination Reaction

on of placent

in the mother’s body.
c. At what interval the egg is formed in human female ovary?
d. Name two STDs caused by bacterial infection.
e. Why is prenatal sex determination prohibited?
PYQ - 5 Marks
Answer 3-
a. Zygote is formed by the fusion of male and female gamete.
b. Placenta is a special tissue through which the developing embryo/foetus gets nutrition from mother’s blood. It also transports wastes of the embryo into mother’s blood.