Is Dionaea both autotrophic and heterotrophic organism ? Please tell


Yes, it is true that Dionaea is said to have both autotrophic as well as heterotrophic mode of nutrition. 
Dionaea is also known as the Venus fly trap plant.
The venus fly trap belongs to the class of Eudicots. Venus fly trap is carnivorous plants that traps and eat the insects and utilize their proteins to fulfill it's nutritional requirements. The leaves have been modified to capture the prey which is an insect. 
Venus fly trap is referred to as autotropic plant because it performs photosynthesis. It is heterotrophic because it requires organic matter and animal nitrogen from the insects.

Note: Insectivorous plants are considered both producers and consumers. For example, Venus fly trap has green leaves and thus it makes its own food with the help of photosynthesis. It is called a consumer because it traps the insects and digests them.

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