Choose the correct pair

Options

A. Coconut, Cucurbits - dioecious
B. Honeybee, Rotifers - parthenogenesis
C. Ornithorhynchus, Whale - viviparity
D. Frog, Peacock - external fertilisation

Answer

To solve the question "Choose the correct pair," we need to analyze each of the given options and determine which pair is correct based on the definitions of the reproductive terms provided.

### Step-by-Step Solution:

1. **Understanding Dioecious Plants:**
- Dioecious refers to plants that have male and female reproductive organs on separate individuals.
- Example: Holly plants, kiwifruit.

2. **Analyzing Option 1: Coconut and Cucurbit**
- The option states that coconut and cucurbit are dioecious.
- However, both coconut and cucurbit are actually monoecious, meaning they have both male and female reproductive organs on the same plant.
- **Conclusion:** This pair is incorrect.

3. **Understanding Parthenogenesis:**
- Parthenogenesis is a form of asexual reproduction where an organism can reproduce without fertilization.
- Examples include certain species of honeybees and rotifers.

4. **Analyzing Option 2: Honey Bee and Rotifers**
- This option claims that honey bees and rotifers reproduce via parthenogenesis.
- This is true; honey bees can reproduce through parthenogenesis, as can some rotifers.
- **Conclusion:** This pair is correct.

5. **Understanding Viviparous and Oviparous:**
- Viviparous organisms give birth to live young, while oviparous organisms lay eggs that hatch into young.
- Example of viviparous: Whales; example of oviparous: Ornithorhynchus (platypus).

6. **Analyzing Option 3: Ornithorhynchus and Whale**
- The statement claims both are viviparous.
- While whales are viviparous, ornithorhynchus is oviparous.
- **Conclusion:** This pair is incorrect.

7. **Understanding External Fertilization:**
- External fertilization occurs outside the organism, typically in water.
- Example: Frogs exhibit external fertilization; peacocks exhibit internal fertilization.

8. **Analyzing Option 4: Frog and Peacock**
- This option states that both frog and peacock undergo external fertilization.
- This is incorrect because frogs undergo external fertilization, but peacocks do not; they undergo internal fertilization.
- **Conclusion:** This pair is incorrect.

### Final Answer:
The correct pair is **Option B: Honey Bee and Rotifers**.

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