Question

The presence or absence of certain sub-cellular components in the cells of three organisms (P, Q and R) is given.

Sub-cellular component	P	Q	R
Ribosomes	present	present	present
Mitochondria	present	absent	present
Mitochondria	present	absent	present
Lysosomes	present	absent	present
Vacuoles	many small-sized	absent	single large-sized

P, Q and R could most likely be.

• A. P: frog, Q: E. coli, R: garlic
• B. P: rat, Q: yeast, R: onion
• C. P: E.coli, Q: Paramecium, R: mushroom
• D. P: Spirogyra, Q: Bacillus, R: yeast

Answer 1

Answer: (A)

P: frog, Q: E. coli, R: garlic

Based on the given data, following interpretations can be made:

1. The cells of P have all the cell organelles which mean it must be a eukaryote and many small-sized vacuoles indicate that it must be an animal.

2. The cells of Q have only ribosomes and no cell organelle which means it must be a bacteria.

3. The cells of R have all the cell organelles which mean it must be a eukaryote and single large-sized vacuole indicates that it must be a plant.

Hence, P could be the frog, Q could be E. coli. and R could be Garlic.

So, the correct answer is A.