Question

The following can be called as plant lysosomes.
A. Spherosomes
B. Aleurone grains
C. Vacuoles
D. All of the above

Answer 1

Hint: Lysosomes are membrane-bound cell organelle.
They are known to break down excess or damaged cells. This is why they are popularly called as suicidal bags of the cells.

Complete answer: Spherosomes (or Oleosomes) are single membrane-bound cell organelles that are found only in plant cells. Their name comes from a protein called oleosins. This protein stabilizes its membrane. They have an oval or spherical shape. They are known as plant lysosome as they contain hydrolytic enzymes like protease, phosphatase, ribonuclease, etc.
Aleurone grain is a specialized dry vacuole. In it, storage proteins accumulate in a stable form in seeds (usually in the endosperm). The aleurone layer is formed by cells containing aleurones.
The vacuole is a membrane-bound cell organelle that is filled with water contain9ing organic and inorganic molecules. A plant cell has a very large vacuole whereas animal cells either lack a vacuole or has a number of vacuoles but in small size.

So, the correct answer is “Option A”.

Note: Spherosomes were discovered by Perner. Their size is about 0.5 to 2.5 micron in diameter. They take part in the storage and synthesis of lipids. They originate from the endoplasmic reticulum and 98% of them are lipid (the remaining 2% are protein). Some of these proteins are enzymatic and take part in lipid synthesis. Spherosomes are found in large quantities in endosperm cells of oil seeds.