Heredity and Evolution — Science STD 10 — Question

State whether the following statements are true or false:
According to Mendeleev’s periodic law, the properties of elements are a periodic function of their atomic numbers.

State whether the following statement is true or false:
Copper sulphate crystals are always wet due to the presence of water of crystallisation in them.

Looming happens due to total internal reflection. [True/ False]

Ultimate cause of variations among living beings is alteration in DNA sequence in the genes. [True/ False]

The sex chromosome for a male are XX where that for a female are XY. [True/ False]

State whether the following statements are true or false:
Energy can be produced in cells without oxygen.

Secondary consumers and tertiary consumers, both are carnivores.

State whether the following statement is true or false:
On going down in a group of the periodic table, the number of valence electrons increases.

State whether the following statement is true or false:
A chemical equation can be balanced easily by altering the formula of a reactant or product.

State whether the following statement is true or false:
The axis of earth’s imaginary magnet and the geographical axis coincide with each other.