Select the correct statement.

Options

A. Haplo-diplontic life cycle is exhibited by both Ectocarpus and Fucus
B. The gametophyte is not independent and free living in pinus and pteris
C. Monocots are characterized by single cotyledonous seeds,parallel venation in leaves and trimerous flowers
D. Antheridium is found in bryophyta,pteridophyta and gymnosperms

Answer

To solve the question, we need to evaluate each of the provided statements and determine which one is correct.

### Step 1: Analyze the First Statement
**Statement:** "Haplodeplontic life cycle is exhibited by both ectocarpus and fucus."

- **Analysis:** Ectocarpus exhibits a haplodeplontic life cycle, while Fucus exhibits a diplontic life cycle. Therefore, this statement is incorrect.

**Hint:** Check the life cycles of the organisms mentioned to determine their classification.

### Step 2: Analyze the Second Statement
**Statement:** "The gametophyte is not independent and free living in Pinus and Teres."

- **Analysis:** In Pinus (a gymnosperm), the gametophyte is indeed dependent on the sporophyte. However, Teres (a pteridophyte) has an independent gametophyte. Thus, this statement is also incorrect.

**Hint:** Remember the characteristics of gametophytes in different plant groups, especially gymnosperms and pteridophytes.

### Step 3: Analyze the Third Statement
**Statement:** "Monocots are characterized by single cotyledon seeds, parallel venation, and trimerous flowers."

- **Analysis:** This statement is correct. Monocots have one cotyledon, their leaves exhibit parallel venation, and their flowers typically have parts in multiples of three (trimerous).

**Hint:** Recall the defining features of monocots to confirm their characteristics.

### Step 4: Analyze the Fourth Statement
**Statement:** "Antheridium is found in bryophyte, pteridophyte, and gymnosperms."

- **Analysis:** Antheridia are present in bryophytes and pteridophytes, but gymnosperms do not have antheridia; they produce pollen grains instead. Therefore, this statement is incorrect.

**Hint:** Differentiate between reproductive structures in cryptogams and phanerogams.

### Conclusion
After analyzing all four statements, the only correct statement is the third one regarding monocots.

**Final Answer:** The correct statement is: "Monocots are characterized by single cotyledon seeds, parallel venation, and trimerous flowers."