Question

The 1st phase of respiration in which carbohydrates are used up

• A. Floating respiration
• B. Protoplasmic respiration
• C. Mitochondrial respiration
• D. ER respiration

Hint:

Remember:
- ______Floating Respiration:______ Uses ______Carbohydrates & Fats______ (Safe/Normal).
- ______Protoplasmic Respiration:______ Uses ______Proteins______ (occurs during Starvation, leads to cell death).

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Cellular respiration is the biochemical process where organic substrates are oxidized to release metabolic energy (ATP).
Depending on the physiological state of the cell and the nature of the respiratory substrates oxidized, respiration is classified into two distinct types: floating respiration and protoplasmic respiration.

Step 2: Detailed Explanation:
Let us compare these two physiological phases of respiration:
1. Floating respiration: This is the normal, healthy phase of cellular respiration. In this phase, the cell utilizes accumulated storage carbohydrates (like starch, sucrose, glucose), fats, or organic acids as the respiratory substrates.
Because these substrates "float" in the cytoplasm and vacuole as reserves, the cell structure is not harmed, and no toxic by-products are generated. Carbohydrates are always metabolized first in this phase.
2. Protoplasmic respiration: This phase occurs only during prolonged starvation when all carbohydrate and lipid reserves are completely exhausted.
In this desperate state, the cell is forced to oxidize structural proteins and protoplasmic components (amino acids) to stay alive.
This results in the breakdown of essential cellular machinery, releases toxic ammonia, and eventually leads to cell death.
Since carbohydrates are the primary, preferred, and first storage materials used up during normal respiration, this represents the floating respiration phase.

Step 3: Final Answer:
The phase of respiration in which carbohydrates are used up is floating respiration, which corresponds to option (A).