Features of insect-pollinated flowers:-

• 1. Large, colourful, fragrant, and rich in nectar. Nectar & pollen grains are the floral rewards for pollination.
• 2. When the flowers are small, they form an inflorescence to make them visible.
• 3. The flowers pollinated by flies and beetles secrete foul odours to attract these animals.
• 4. The pollen grains are generally sticky.
• When the animal comes in contact with the anthers and the stigma, its body gets a coating of pollen grains. When it comes in contact with the stigma, it results in pollination.
• Some plants provide safe places as a floral reward to lay eggs.
  E.g. Amorphophallus (it has the tallest flower of about 6 feet). A species of moth and the plant Yucca cannot complete their life cycles without each other. The moth deposits its eggs in the locule of the ovary, and the flower gets pollinated by the moth. The larvae of the moth come out of the eggs as the seeds start developing.
• Many insects consume pollen or nectar without bringing about pollination. They are called pollen/nectar robbers.