12th - the flower - biology

The flower

1. The Flower

2. LEARNING OUTCOME To study the structure of bisexual flower To summarise essential and non-essential reproductive whorls

3. LEARNING OBJECTIVE DISCUSS IN DETAIL ABOUT THE STRUCTURE OF A BISEXUAL FLOWER?

4. The Flower Structure Of A Bisexual Flower

5. The Flower Structure Of A Bisexual Flower BISEXUAL FLOWER

6. The Flower Structure Of A Bisexual Flower BISEXUAL FLOWER Bisexual or perfect flowers have both male (androecium) and female (gynoecium) reproductive structures , including   stamens  and an ovary .

7. The Flower Structure Of A Bisexual Flower UNISEXUAL FLOWER A flower that has only one reproductive structure , either male or female , is called a unisexual flower.

8. The Flower Structure Of A Bisexual Flower STAMINATE FLOWER A unisexual flower , which contains only androecium is called a male or Staminate flower.

9. The Flower Structure Of A Bisexual Flower PISTILLATE FLOWER A unisexual flower , which contains only gynoecium is called a female or Pistillate flower.

10. The Flower Structure Of A Bisexual Flower NEUTER FLOWER A flower in which both male and female reproductive organs are absent is called a neuter flower.

11. The Flower SEXUALITY IN PLANTS TWO TYPES MONOECIOUS DIOECIOUS

12. The Flower MONOECIOUS PLANT If the male and female flowers grow on the same plant , then the plant is said to be a monoecious plant. E.g. Pumpkin , Maize , Cucumber

13. The Flower DIOECIOUS PLANT If the male and female flowers grow on separate plants , then the plant is said to be a dioecious plant. Examples: Palm , Papaya .

14. The Flower COMPLETE AND INCOMPLETE FLOWERS

15. The Flower COMPLETE AND INCOMPLETE FLOWERS When all the four whorls of the flower are present , it is called a complete flower. 

16. LEARNING OUTCOME To study the structure of bisexual flower To summarise essential and non-essential reproductive whorls

17. The Flower COMPLETE AND INCOMPLETE FLOWERS When all the four whorls of the flower are present , it is called a complete flower.  All bisexual flowers are generally complete flowers. Example:  Hibiscus

18. The Flower COMPLETE AND INCOMPLETE FLOWERS Essential/ Reproductive Whorls

19. The Flower COMPLETE AND INCOMPLETE FLOWERS Essential/ Reproductive Whorls The whorls that are directly associated with the process of reproduction .

20. The Flower COMPLETE AND INCOMPLETE FLOWERS Essential/ Reproductive Whorls The whorls that are directly associated with the process of reproduction . E.g. Stamen and Carpel

21. The Flower Non- Essential/ Non-Reproductive Whorls The whorls that are not directly associated with the process of reproduction .

22. The Flower Non- Essential/ Non-Reproductive Whorls The whorls that are not directly associated with the process of reproduction . Help and protect the reproductive parts of the flower E.g. Calyx And Corolla .

23. The Flower Non- Essential/ Non-Reproductive Whorls PERIANTH

24. The Flower Non- Essential/ Non-Reproductive Whorls PERIANTH In plants, such as wheat and grasses , the petals and sepals are undifferentiated and together compose the Perianth .

25. The Flower Non- Essential/ Non-Reproductive Whorls PETALOID PERIANTH In some plants, the sepals are not green but appear brightly coloured as the petals.

26. The Flower Non- Essential/ Non-Reproductive Whorls PETALOID PERIANTH These sepals are called petaloid sepals , and the perianth is called a petaloid perianth .

27. The Flower Non- Essential/ Non-Reproductive Whorls PETALOID PERIANTH These sepals are called petaloid sepals , and the perianth is called a petaloid perianth . E.g. Orchid

28. The Flower Non- Essential/ Non-Reproductive Whorls SEPALOID PERIANTH In some plants, the petals appear green in colour and are called sepaloid petals. 

29. The Flower Non- Essential/ Non-Reproductive Whorls SEPALOID PERIANTH The perianth is called a sepaloid perianth .

30. The Flower Non- Essential/ Non-Reproductive Whorls NECTARIES Nectar is a sugary liquid produced by plants.

31. The Flower Non- Essential/ Non-Reproductive Whorls NECTARIES The nectar in flowers is secreted by a group of cells , present either at the base of the pistil or on the petals . These groups of cells are called nectaries .

32. The Flower Non- Essential/ Non-Reproductive Whorls NECTARIES They attract insects such as bees and ants for cross pollination . In some cases, nectaries are very prominent .

33. The Flower Non- Essential/ Non-Reproductive Whorls NECTARIES E.g. Nasturtium

34. LEARNING OUTCOME To study the structure of bisexual flower To summarise essential and non-essential reproductive whorls

35. Whiteboard