Photosynthesis in Leaves

Questions and Answers

To conduct cellular respiration and photosynthesis

To facilitate gas exchange through stomata

To move water throughout the plant

To determine when stomata are opened or closed Signup and view all the answers

To regulate water loss and carbon dioxide absorption Signup and view all the answers

Both the palisade and spongy layers Signup and view all the answers

To facilitate gas exchange through stomata Signup and view all the answers

They are columnar and tightly packed together Signup and view all the answers

To prevent water loss and control gas exchange Signup and view all the answers

Upper epidermis Signup and view all the answers

Leaves Signup and view all the answers

To prevent water loss Signup and view all the answers

To facilitate photosynthesis Signup and view all the answers

Producing cellular energy Signup and view all the answers

Photosynthesis Signup and view all the answers

Study Notes

Plants are autotrophic organisms that produce their own energy through photosynthesis.
Chlorophyll, the light-capturing pigment, is found in chloroplasts, which are primarily located in leaves.

A leaf consists of several layers that work together to facilitate photosynthesis.
The layers include the cuticle layer, upper epidermis, palisade layer, spongy layer, lower epidermis, and stomata.

The cuticle layer is a waxy layer that protects the leaf from water loss and physical/chemical damage.
It controls the entrance and exit of carbon dioxide and oxygen from the leaf's surface.
The cuticle layer adapts to different climates, becoming thicker in dry climates and thinner in moist climates.

The upper epidermis consists of a thin layer of cells that allow sunlight to pass through.
It helps prevent excessive water loss and regulates carbon dioxide and oxygen absorption.
Cells in this layer do not possess chloroplasts, where photosynthesis takes place.

The spongy layer consists of irregularly shaped cells that facilitate the diffusion of nutrients and gases.
It works with the stomata to control gas exchange and stores products of photosynthesis.
The spongy layer contains vascular bundles responsible for transporting nutrients throughout the plant.

The lower epidermis is a continuation of the epidermal cells on the upper surface of the leaf.
It secretes the waxy substance associated with the cuticle layer and facilitates gas exchange via stomata.

Stomata are pores in the lower epidermis where gas exchange occurs.
Guard cells, which contain chloroplasts, surround each stomata and regulate its opening and closing.
Guard cells respond to changes in light, hydration, and temperature to control nutrient and gas exchange.