Question

A flowering plant is planted in an earthen pot and irrigated urea is added in high amounts to make the plant grow faster but after some time the plant died. This may be due to-

• A. Endosmosis
• B. Exosmosis
• C. Suffocation
• D. Water logging

Answer 1

The correct option is B

Exosmosis

The correct option is B

Explanation of correct option:

1. Endosmosis and exosmosis are the two types of osmosis where the water moves across the cell membrane.
2. In a hypertonic solution, the solution consists of more solutes compared to the cell.
3. Thus, the water moves from the inside to the outer side of the cell. This is called exosmosis.
4. A high amount of urea solution is an example of hypertonic solution, thus causing exosmosis to occur.

Explanation of incorrect option

Option A

1. In a hypotonic solution, the solution consists of fewer solutes compared to the cell.
2. Thus, the water moves from the outside to the inside of the cell. This is called endosmosis.

Option C

1. Suffocation refers to the reduced availability of oxygen. This causes the organism to die.
2. Gaseous exchange occurs in the roots of plants. If overwatered, the plant can suffocate and eventually die.

Option D

1. Waterlogging refers to excess watering of plants, that causes stagnation of water.
2. This results in soil compaction thereby blocking the air-pockets present in the soil around roots.
3. This will cause the roots to rot as well as affect gaseous exchange.

Final Answer:

Irrigation of urea in high amounts in flowering plants may result in faster growth but cause the plant to die due to exosmosis.