Explain these following terms:

Solution

(a). Nucleus is called “Director of the cell”

(b). Mitochondria is called power house of cell.

(c).ATP is said to be the energy currency of cell.

(d). Lysosomes are commonly called suicidal bags of cells.

(e). Chlorophyll molecule trap radient energy for high reactions of photosynthesis.

(f). Chloroplasts are the kitchens of the cell.

(g). Meiosis is called reductional division.

(h).Interphase is called resting phase.

(i). Endoplasmic Reticulum is called circulatory system of cell.

(j). Meiosis is called reductional division.

Answer:

(a). It controls and co-ordintes all the cellular functions because nucleus directs all metabolic activities of the cell.

(b).Mitochondria synthesize, energy-rich compounds (ATP)

(c) . ATP is called energy currency as ATP has three phosphate which are attached with bonds. When it
breaks energy is released, which is used up by the cell.

(d).These have hydrolytic enzyme which can start autolysis after celluar death. i.e., Lysosomes digest the entire damaged or dead cell.

(e).Nuclear membrane is porous to allow the pessage of different types of RNAs, ribosomal proteins and ribosomal sub units.

(f). Chloroplast are the sites of photosynthesis of organic foods as it synthesis glucose in    presence of CO_2, H₂O and sunlight.

(g).Meiosis is called reductional division as number fo chromosome is reduced to half.

8. Interphase is the phase of active biosynthesis. It is called resting as the cell prepare it self for      next division.

(h).Endophasmic reticulum helps in distribution of soluble matters and it also provides a path way for thedistribution of nuclear material from one cell to other.

(i). Meiosis is called reductional division as number fo chromosome is reduced to half.