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What happens when the water content of the pond dries up?
What happens when the water content of the pond dries up?
- The mother cell wall disintegrates
- The daughter cells divide rapidly
- The aplanospores develop flagella
- The mother cell wall imbibes moisture and becomes mucilaginous (correct)
What happens to the mucilaginous walls when favorable conditions reappear after rains?
What happens to the mucilaginous walls when favorable conditions reappear after rains?
- They transform into daughter cells
- They develop flagella
- They dissolve, setting free the aplanospores of last generations (correct)
- They become more rigid
What do the aplanospores develop into after the mucilaginous walls dissolve?
What do the aplanospores develop into after the mucilaginous walls dissolve?
- Flagellates
- Daughter cells
- Zoospores (correct)
- Mother cells
Chlamydomonas grows into aplanospores
Chlamydomonas grows into aplanospores
What happens to the cell wall every time a cell divides?
What happens to the cell wall every time a cell divides?
The daughter aplanospores remain confined when favorable conditions reappear after rains
The daughter aplanospores remain confined when favorable conditions reappear after rains
The mother cell wall imbibes moisture and becomes mucilaginous
The mother cell wall imbibes moisture and becomes mucilaginous
The cell divides repeatedly over a number of generations to give hundreds and thousands of daughter cells
The cell divides repeatedly over a number of generations to give hundreds and thousands of daughter cells
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Study Notes
Life Cycle of Chlamydomonas
- When the water content of a pond dries up, Chlamydomonas cells undergo a transformation to survive.
- The mucilaginous walls of the cells become desiccated and shrivel up, protecting the cells from dehydration.
- When favorable conditions return after rains, the mucilaginous walls rehydrate and dissolve, releasing the aplanospores.
- The aplanospores develop into new Chlamydomonas cells.
- Chlamydomonas cells can grow into aplanospores as a survival mechanism.
- Every time a Chlamydomonas cell divides, the cell wall is temporarily broken down to allow for daughter cell formation.
- The daughter aplanospores remain confined within the mother cell wall until favorable conditions reappear.
- The mother cell wall imbibes moisture and becomes mucilaginous, allowing the daughter cells to escape.
- Through repeated cell division, a single Chlamydomonas cell can give rise to hundreds and thousands of daughter cells.
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