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A planaria worm is cut horizontally into two halves P and Q such that the part P contains the whole head of the worm. Another Planaria worm is cut vertically into two halves R and S in such a way that both the cut pieces R and S contain half head each. Which of the two planaria worms could regenerate to form the complete respective worms?
  • a)
    Only R and S
  • b)
    Only P
  • c)
    P, R and S
  • d)
    P, Q, R and S
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
A planaria worm is cut horizontally into two halves P and Q such that ...
Planaria are free-living flatworms that live in quiet ponds or bodies of water. They have the unique ability to regenerate, meaning they can re-grow the new tissue to replace lost or injured tissue.
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A planaria worm is cut horizontally into two halves P and Q such that ...
The correct answer is option 'D' - P, Q, R, and S.

Regeneration is the ability of an organism to replace damaged or lost body parts. Planaria worms are known for their remarkable regenerative abilities. They have the ability to regenerate their entire body from just a small fragment. Let's analyze the given information to understand which worms can regenerate fully.

1. Worm cut horizontally into two halves P and Q:
The part P contains the whole head of the worm. The head region of a planaria worm contains the majority of its vital organs, including the brain and sensory organs. Therefore, if part P contains the entire head, it has the potential to regenerate the entire organism.

2. Worm cut vertically into two halves R and S:
Both cut pieces R and S contain half of the head each. Since the head region is split between the two pieces, neither R nor S alone can regenerate the complete worm. However, if both pieces R and S are combined, they can regenerate the complete head region. This is because planaria worms have the ability to fuse together and regenerate missing body parts.

Therefore, the worms that can regenerate to form the complete respective worms are P, Q, R, and S. Part P can regenerate the entire worm as it contains the whole head. Parts R and S, although individually incomplete, can fuse together to regenerate the complete head region. And part Q, although not mentioned specifically, would likely be able to regenerate the tail region or other body parts.

In conclusion, planaria worms have a remarkable ability to regenerate, and in this case, the worms that can regenerate to form complete organisms are P, Q, R, and S.
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A planaria worm is cut horizontally into two halves P and Q such that the part P contains the whole head of the worm. Another Planaria worm is cut vertically into two halves R and S in such a way that both the cut pieces R and S contain half head each. Which of the two planaria worms could regenerate to form the complete respective worms?a)Only R and Sb)Only Pc)P, R and Sd)P, Q, R and SCorrect answer is option 'D'. Can you explain this answer?
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