What type of plant tissue contains chloroplasts and is responsible for photosynthesis?

Prepare for the IB Diploma Biology Test. Study with flashcards and multiple choice questions, each question offers hints and explanations. Get ready to ace your exam!

Mesophyll tissue is the specialized plant tissue where photosynthesis occurs, and it contains chloroplasts that capture light energy and convert it into chemical energy. The mesophyll is primarily located in the leaves of plants, where it is strategically positioned to maximize light absorption.

This tissue is structured into two types: palisade mesophyll and spongy mesophyll. The palisade mesophyll cells, which are elongated and tightly packed, are found just beneath the upper epidermis of the leaf. They contain a high concentration of chloroplasts to enhance their ability to perform photosynthesis efficiently. The spongy mesophyll, on the other hand, has more air spaces that facilitate gas exchange, further supporting the photosynthetic process by allowing carbon dioxide to diffuse to the chloroplasts.

While collenchyma provides structural support, parenchyma has various functions, including storage and healing, and ground tissue encompasses several cell types involved in support, storage, and photosynthesis. However, it is the mesophyll tissue that uniquely contains chloroplasts and is specifically responsible for photosynthesis, making it the correct choice.

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