What is dispersal of seeds? State four agents of dispersal. Explain four disadvantages of vegetative propagation.

Question 1: A displacement reaction is a chemical reaction in which a more reactive element takes the place of a less reactive element in a compound.

Example: Zinc displaces copper from copper(II) sulfate solution.

$$\ce{Zn(s) + CuSO4(aq) -> ZnSO4(aq) + Cu(s)}$$

Question 2: Three components of a solar panel are:

• Photovoltaic (solar) cells
• Tempered glass cover
• Aluminium frame

Question 3: Two compounds formed by magnesium and chlorine: Magnesium chloride ($\ce{MgCl2}$). (Note: Primary stable compound is magnesium chloride; perhaps referring to systematic name magnesium dichloride.)

Question 4: Two compounds formed