A mature Hydra usually bears

Options

A. One testis and several ovaries
B. One testis and one ovary
C. Several testes and one ovary
D. Several testes and several ovaries.

Answer

To answer the question "A mature Hydra usually bears," we need to analyze the reproductive structures of Hydra. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand Hydra's Reproductive System
Hydras can be either dioecious (having separate male and female individuals) or monoecious (hermaphroditic, possessing both male and female reproductive organs).

**Hint:** Remember the terms dioecious and monoecious. Dioecious means separate sexes, while monoecious means both sexes in one organism.

### Step 2: Identify Male Reproductive Structures
In male hydras, the reproductive structures are called testes. Typically, a mature male Hydra can have several testes, usually ranging from 1 to 8. These testes are smaller in size and are located near the distal end of the body.

**Hint:** Focus on the number and location of testes in male hydras.

### Step 3: Identify Female Reproductive Structures
In female hydras, there is usually one ovary, which is larger in size compared to the testes. This ovary is located towards the basal end of the body.

**Hint:** Remember that females typically have one ovary, and its location is different from that of the testes.

### Step 4: Analyze the Options
Now, let's evaluate the options given in the question:
- **One testis and several ovaries**: Incorrect, as males have multiple testes, not ovaries.
- **One testis and one ovary**: Incorrect, as males do not have ovaries.
- **Several testes and one ovary**: This is correct for a male hydra (several testes) and a female hydra (one ovary).
- **Several testes and several ovaries**: Incorrect, as males do not have ovaries.

**Hint:** Compare each option with the reproductive anatomy of both male and female hydras.

### Step 5: Conclusion
Based on the analysis, the correct answer is that a mature Hydra usually bears **several testes and one ovary**.

**Final Answer:** Several testes and one ovary.