A C4 plant is a plant that cycles carbon dioxide into four-carbon sugar compounds to enter into the Calvin cycle. These plants are very efficient in hot, dry climates and make a lot of energy. Many foods we eat are C4 plants, like corn, pineapple, and sugar cane.

C-4 plants are a type of plants that have adapted to hot and dry environments. They have a unique photosynthetic pathway that allows them to efficiently capture and utilize carbon dioxide (CO2) for photosynthesis. These plants are found in various families and can include both monocots and dicots.

C-4 Photosynthesis
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C-4 plants have evolved a specialized mechanism called C-4 photosynthesis, which helps them overcome the limitations of regular or C-3 photosynthesis. In C-3 plants, CO2 is initially fixed into a three-carbon molecule, while in C-4 plants, it is first fixed into a four-carbon molecule.

Different Families
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C-4 plants are found in various families, including both monocots and dicots. Some of the families that have C-4 plants include:

1. Gramineae (Grass Family): This family includes many grass species, such as corn (maize), sugarcane, sorghum, and bamboo. These grasses are monocots and are known for their C-4 photosynthetic pathway.

2. Amaranthaceae (Amaranth Family): This family includes plants like Amaranthus and Alternanthera. They can be either monocots or dicots and have C-4 photosynthesis.

3. Cyperaceae (Sedge Family): Sedges such as Cyperus and Carex are examples of C-4 plants found in this family. They are monocots.

4. Asteraceae (Aster Family): Some species in the Asteraceae family, including some sunflowers and ragweeds, have C-4 photosynthesis. This family includes both monocots and dicots.

Adaptation to Environmental Conditions
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C-4 plants have evolved this specialized photosynthetic pathway to overcome the limitations of C-3 photosynthesis in hot and dry environments. The C-4 pathway allows them to efficiently fix CO2 and minimize water loss through transpiration. This adaptation helps them thrive in regions with high temperatures, intense sunlight, and limited water availability.

Conclusion
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In conclusion, C-4 plants are found in various families, including both monocots and dicots. They have evolved a specialized photosynthetic pathway to adapt to hot and dry environments. The ability of C-4 plants to efficiently capture and utilize CO2 makes them well-suited for survival in these challenging conditions.

It is found mostly in monocot and some dicot also......
so 4option is correct