The seed of Pinus sp. Is

Options

A. Uneconomic and nonendospermic
B. Abaxial and rounded
C. Adaxial and endospermic
D. Hypogeal and monocothyledonous

Explanation

### Step-by-Step Solution:

1. **Identify the Seed Characteristics**: The seed of Pinus species is classified as endospermic. This means that the seed contains endosperm, which is a tissue that provides nutrition to the developing embryo.

**Hint**: Remember that endospermic seeds have a nutrient-rich tissue that supports the embryo during germination.

2. **Determine the Ploidy Level**: The seed of Pinus is diploid (2n). This indicates that it has two sets of chromosomes, one from each parent.

**Hint**: Ploidy levels can be identified as haploid (n) or diploid (2n). In this case, look for the presence of two sets of chromosomes.

3. **Examine the Seed Structure**: The seeds of Pinus are winged, meaning they have thin, membranous wings that aid in wind dispersal. These wings are also diploid.

**Hint**: Winged seeds are a common adaptation for dispersal in many plants, allowing them to spread over larger areas.

4. **Understand the Development**: The seeds develop from the ovuliferous scale, which is a structure that supports the ovule. The development occurs on the basal upper surface of the scale.

**Hint**: The ovuliferous scale is crucial for seed development, as it provides the necessary support and nutrition.

5. **Clarify Misconceptions**: It is important to note that the seeds are not un-economic; they are edible and have significance in various ecosystems.

**Hint**: Economic importance can vary; always consider the ecological and nutritional value of plant parts.

6. **Identify the Correct Option**: Based on the characteristics discussed, the correct answer regarding the seed of Pinus sp. is that it is endospermic, diploid, and winged.

**Hint**: When choosing the correct answer, eliminate options that contradict the established characteristics of the seed.

### Final Answer:
The seed of Pinus sp. is endospermic, diploid, and winged.