Which pair of structures would provide a positive identification of a plant cell under a microscope?
(a)ribosomes, chloroplasts
(b)cell wall, chloroplast
(c)plasma membrane, large central vacuole
(d)cell wall, mitochondria

The pair of structures that would provide positive identification of a plant cell under a microscope are cell wall and chloroplast (Option b).

Plant cells have a cell wall mainly composed of a complex carbohydrate called cellulose.

This structure (cell wall) provides structural support to plant cells.

Moreover, plant cells also have an organelle known as chloroplast, which serves to synthesize simple carbohydrates (sugars) by a process known as photosynthesis.

In conclusion, the pair of structures that would provide positive identification of a plant cell under a microscope are cell wall and chloroplast (Option b).

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The correct option is Option B i.e. cell walls and chloroplasts.

Explanation:

1. The plant cells differ with the animal cells with respect to some points.

2. Firstly, the presence of cell walls are exclusive for plants and totally absent in animals.

3. Secondly, the presence of chloroplasts or plastids is exclusive for plants.

4. Thirdly, vacuoles are huge in plant cells, but smaller in animals. They give extra support to each cells for standing, and also to store several excretory products.