Copulation of male and female frogs is called amplexus, because

Answer

**Step-by-Step Solution:**

1. **Understanding Amplexus**: Amplexus is the term used to describe the mating behavior of frogs, where the male frog grasps the female frog. This behavior is crucial for their reproductive process.

2. **Reason for the Name**: The term "amplexus" is derived from the Latin word meaning "to embrace." This reflects the physical position of the male frog as it holds onto the female during mating.

3. **Mating Behavior**: During the breeding season, male frogs attract females with their calls. When a female approaches, the male climbs onto her back and holds her with his forelimbs, specifically using structures called nuptial pads located on his thumbs.

4. **Egg and Sperm Release**: While in this position, the male exerts pressure on the female's abdomen, prompting her to release eggs. Simultaneously, the male releases sperm over the eggs to facilitate fertilization.

5. **Absence of Copulatory Organs**: Frogs do not possess specialized copulatory organs like many other animals. Instead, they rely on this external method of fertilization, which is why the process is termed "false copulation."

6. **Duration of Amplexus**: The duration of amplexus can vary, sometimes lasting for several hours or even days, which contradicts the idea that it is of very short duration.

7. **Conclusion**: The correct reason why the copulation of male and female frogs is called amplexus is that frogs have no copulatory organs, making their mating behavior a form of false copulation.

**Final Answer**: The copulation of male and female frogs is called amplexus because frogs have no copulatory organs.

---