Which of the following is a pair of analogous organs ?

Options

A. Contractile vacuole in Amoeba and uriniferous tubule in frog
B. Paddle of whale and front legs of horse
C. Thorn of Bougainvillea and tendrils of Cucurbita
D. Forelimbs in lizard and wings in birds

Answer

To determine which of the following is a pair of analogous organs, we first need to understand what analogous organs are. Analogous organs are those that have different origins but perform similar functions.

Let's analyze the options provided:

1. **Contractile vacuole in amoeba and uriniferous tubules in frogs**:
- Both of these structures serve the function of osmoregulation, which is the process of maintaining the balance of water and salts in the body.
- They are different in origin (contractile vacuole is a single-celled organism's structure while uriniferous tubules are part of a multicellular organism's excretory system).
- Therefore, this pair is analogous.

2. **Pedal of whales and front leg of horses**:
- These structures have a similar structural origin (both are limbs) but serve different functions (whales use their flippers for swimming while horses use their legs for running).
- This makes them homologous, not analogous.

3. **Thorn of Bougainvillea and tendrils of Cucurbita**:
- Both structures arise from the same part of the plant (auxiliary buds) but serve different functions (thorns provide protection while tendrils provide support).
- This is another example of homologous organs.

4. **Forelimbs of lizards and wings of birds**:
- These structures have a similar structural origin but serve different functions (lizards use their forelimbs for crawling while birds use their wings for flying).
- Hence, they are also homologous.

After analyzing all the options, we conclude that the correct answer is:

**Option 1: Contractile vacuole in amoeba and uriniferous tubules in frogs** are a pair of analogous organs.