Mycoplasma is the smallest known cell. It is about 0.1 micrometres in diameter.

This is the correct answer as mitochondria is the powerhouse of the cell. It uses molecular oxygen and generates energy-rich compound (ATP). 

Osmosis is a vital function for the growth and stability of a plant.

This is an incorrect pair as lysosomes are not the site of cellular respiration. 

This is the correct answer because green colour of tomatoes and chillies is due to chloroplast and this chloroplast gets converted into chromoplast.

The nucleus is often called the director of a cell because it controls all the metabolic and other cell functions.

Chloroplast (green plastid) helps in photosynthesis. It is known as "the kitchen room" of a cell.

Leucoplasts are primary organelles in which materials such as starch, oils and protein granules get stored. Leucoplasts are also known as white plastids.

Lysosomes secrete digestive enzymes. They help to keep a cell clean by digesting any foreign material.

Endoplasmic reticulum divides the cytoplasm into small compartments. It gives rigidity to a cell. 

This is the correct answer because when raisins are put into pure water, the concentration inside raisins of water is less. Due to this, water from outside penetrates the raisins and they swell up. When they are put inside the salt solution, concentration of water is more inside than outside. Thus, water penetrates outside the walls of the raisins and they shrink.

Osmosis is the correct answer as it involves the movement of water molecules from a region of high concentration to low concentration.

Adenosine triphosphate is often known as the energy currency of cell because the energy required for various chemical activities needed for life is released by mitochondria in the form of ATP. 

Plastids are present only in plant cell. 

Endosmosis is the movement of water inside the cell from a region of higher concentration to lower concentration.