Biology

CONTENTS

● Introduction● Starch in leaves● Destarched plant● Carbon di oxide and starch production● Light and starch production● Mineral salts

INTRODUCTION

● Photosynthesis is a process used by plants and other organisms to convert light energy, normally from the sun, into chemical energy which can be used as a fuel.

● It is an chemical reaction

STARCH IN LEAVES

● Starch is a store of energy. It is a carbohydrate and forms colorless grains.

● It is stored in the palisade and spongy mesophyll layer.

DESTARCHED PLANT

● A plant from which the starch has been removed is called a destarched plant.

● A plant is destarched by keeping it in an dark place, such as a cupboard, for two of three days.

● Once a plant is destarched it is ready to take part in investigations about photosynthesis

CARBON DI OXIDE AND STARCH PRODUCTION

● Take two flowers in a pot and cover those both plant with a plastic cover.

● Then in one plant keep soda lime and in another plant keep sodium hydrogen carbonate.

● Then observe for sometime.

LIGHT AND STARCH PRODUCTION

● The test for sunlight is an experiment. It is to check that the plant needs sunlight to make photosynthesis.

● The experiment = Cover two leaves of a plant with an aluminium foil and another leaf is plastic covering.

● After this find out which leaf has starch and confirm does it need sunlight or not

MINERAL SALTS

● The plants which has a lack of any mineral has one deficiency.

● If the plant have lack of nitrogen its leaves turn yellow and the plant shows poor growth.

● If the plant have lack of phosphorus it shows a very poor growth.

● If the plant have lack of potassium the leaves become yellow and the plant and grow abnormally.

LACK OF NITROGEN

LACK OF PHOSPHORUS

LACK OF POTASSIUM