PLASTIDS

plastids are cell organelles that are exclusively found in plant cells.

1. PLASTIDS By, Panjami Rajan Natural Science Roll No. : 27 1

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3. INTRODUCTION We are often fascinated and attracted by the colour of flowers, fruits and vegetables and we all might have noticed that colour of fruit and its taste changes when it ripens. Have anyone ever thought about the reason behind this change???... The reason behind this phenomenon or change is “ PLASTIDS ”. 3

4. PLASTI D S Plastids are the cell organelles that are exclusively found in plant cells. Plastids found in plant cells are responsible for change in colour and taste of fruits as it ripens. 4

5. KINDS OF PLA STIDS There are three kinds of plastids, they includes; Chromoplasts Chloroplasts Leucoplasts 5

6. PLASTIDS & PIG MENTS Chromoplasts : Imparts colour to flowers and fruits. PIGMENTS PRESENT: Carotene (yellowish orange)- found in carrot. Xanthophyll (yellow)- petals of yellow flowers. Anthocyanin (red, purple)- impart red colour to tomato and purple colour to brinjal . 6

7. Chloroplast: Photosynthesis is performed by chloroplast. PIGMENTS PRESENT : Chlorophyll a ( bluish green) Chlorophyll b (yellowish green) 7

8. Leucoplasts: Leucoplasts are plastids having no specific colour . Leucoplasts are seen in plenty in cells where food materials are stored. They are seen in potato , radish etc. 8

9. WHAT HAPPENS WHEN FRUIT RIPENS? As fruits ripen, chloroplasts change to chromoplasts and starch is converted to sugar. This is the reason behind the change in the colour and taste of fruits. 9

10. CONCLUSION The reason behind eye catchy colour of fruits , flowers and vegetables is due to the presence of plastids. 10

11. THANK YOU 11