Question

Palmella stage of Ulothrix/ Chlamydomonas is formed in response to

• A. Toxic chemical
• B. Water deficiency
• C. Unfavorable Environment
• D. All of these

Answer 1

The correct option is D

All of these

The correct option is D.

Explanation of correct options:

Option D

1. Palmella stage is a type of asexual reproduction that is seen in green algae such as Ulothrix and Chlamydomonas.
2. This stage occurs under unfavorable conditions such as water deficiency or excess toxic chemicals.
3. The parent cell's protoplast divides to produce several daughter protoplasts, but they do not develop into zoospores.
4. The parent cell wall gelatinizes to create a mucilaginous sheath surrounding the daughter protoplasts. The daughter protoplasts do not produce flagella but surround themselves with a gelatinous wall. Palmellospores are the name given to these protoplast segments.
5. It is known as the palmella stage when these protoplasts begin to divide and eventually form an amorphous colony with an infinite number of spores.
6. The gelatinous wall dissolves when favorable conditions return, palmellospores produce flagella, and the spores are liberated to form new thalli.

Final answer: Palmella stage of Ulothrix/ Chlamydomonas is formed in response to the toxic chemicals, water deficiency, and an unfavorable environment.