Photosynthesis

definition to check

Photosynthesis [N-UNCOUNT] is the way that green plants make their food using sunlight

Green plants need sunlight to make food

the text. Can you answer your questions?

Why is photosynthesis needed?
(It provides the plants with food)

How many stages are there in photosynthesis?
(Two)

along the food chain from one life form to another. Some animals eat plants to get energy. Other animals then eat these animals to obtain the energy they need. Plants, on the other hand, produce their own food using energy from the sun. They do this through a process called 'photosynthesis'.

FOOD FROM THE SUN

(C02) and water (H20) into carbohydrates. Carbohydrates are chemicals that contain hydrogen, carbon and oxygen and they are the plant's food. To start the process, the plant absorbs carbon dioxide through tiny holes in its leaves and sucks up water from the soil through its roots. A green substance in the plant's leaves called chlorophyll absorbs energy from the sun. The plant now has all it needs for photosynthesis to begin.

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WHAT IS PHOTOSYNTHESIS?

carbon ['kɑːb(ə)n] углерод

oxygen ['ɔksɪʤən] кислород

first stage, called the light reaction, light energy from the sun is converted into chemical energy. This energy is stored in a chemical called ATP (adenosine triphosphate). The second stage of the process is the dark reaction. In this reaction, the plant converts the carbon dioxide and water into carbohydrates. Carbohydrates provide the plant with the energy it needs in order to grow.

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THE LIGHT AND DARK REACTIONS

adenosine triphosphate
аденозинтрифосфат, АТФ

this equation

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NOW FOR THE SCIENCE BIT!

well as providing food for the plant from the sun's energy, the equation shows that the reaction also produces the oxygen that animals need to breathe. Without photosynthesis, our planet could not support life as we know it.

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A LIFE-GIVING PROCESS

to achieve an objective (процесс: серия действий, выполняемых для достижения цели)
absorbs: soaks up (поглощать: впитывать)
sucks up: draws a liquid upwards using force (высасывать: тянуть жидкость вверх с помощью силы)
roots: part of a plant that grows into the ground (корни: часть растения, что растет в земле)
substance: a solid, liquid or gas (вещество: твердое, жидкое или в газообразном состоянние)
reaction: a chemical process in which two substances combine to form another substance (реакция: химический процесс, при котором два вещества образуют другое вещество converts: changes sth into sth else (преобразовывать: изменить что-либо на что-либо)
equation: a mathematical statement to explain a process (уравнение: математическое утверждение, чтобы объяснить процесс)

is the production of carbohydrates from 1 …………………….. and 2 …………. using 3………………. from the sun and 4…………………. which exists in the cells of green plants

carbon dioxide

water

light energy

chlorophyll