Indicate whether the following statements are true (T) or false (F) by placing a tick (✓) in the appropriate box in each case - Leaving Cert Biology - Question 5 - 2014
Question 5
Indicate whether the following statements are true (T) or false (F) by placing a tick (✓) in the appropriate box in each case.
(a) Single-celled organisms use meios... show full transcript
Worked Solution & Example Answer:Indicate whether the following statements are true (T) or false (F) by placing a tick (✓) in the appropriate box in each case - Leaving Cert Biology - Question 5 - 2014
Step 1
Single-celled organisms use meiosis for asexual reproduction.
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Answer
False. Single-celled organisms typically reproduce asexually through binary fission, which involves mitosis, not meiosis.
Step 2
In telophase of mitosis, a cleavage furrow forms in plant cells.
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Answer
False. In plant cells, a cell plate forms instead of a cleavage furrow during telophase.
Step 3
When a cell is not dividing it is said to be in prophase.
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Answer
False. A cell that is not actively dividing is typically in interphase, not prophase.
Step 4
The nuclear membrane disappears in the early part of mitosis.
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Answer
True. The nuclear membrane disintegrates during prophase, which is the early stage of mitosis.
Step 5
Centromeres give rise to the nuclear spindle.
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Answer
False. Centromeres are the regions of chromosomes where the sister chromatids are joined, but the nuclear spindle is formed from microtubules originating from centrosomes.
Step 6
Mitosis is a source of variation.
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False. Mitosis produces genetically identical cells, thereby not introducing variation. Variation occurs primarily through meiosis.
Step 7
In multicellular organisms, mitosis is primarily used for growth.
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Answer
True. In multicellular organisms, mitosis is crucial for growth and tissue repair by creating new cells.
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