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Bisexual or perfect flowers have both male (androecium) and female (gynoecium) reproductive structures, including stamens and an ovary. There are many flowers which have both stamens and carpels together in the same flower. A few examples of such flowers include Hibiscus, Sunflower, Rose, Lily, Tulip, and Daffodil The male parts of the flower are called the stamens and are made up of the anther at the top and the stalk or filament that supports the anther. The female elements are collectively called the pistil. The top of the pistil is called the stigma, which is a sticky surface receptive to pollen 1) Why is there a need to harness non-conventional sources of energy give two main reasons The two main reasons to harness non-conventional sources of energy are: ... As, fossil fuels like coal, petroleum, are present in a limited amount which and are likely to finish one day so the need for alternative sources of energy is essential. Energy generated by using wind, tides, solar geothermal heat and biomass including farm and animal waste as well as human excreta is known as non-conventional energy. All these sources are renewable or inexhaustible and do not cause environment pollution. More over they do not require heavy expenditure