Consider the following kinds of organisms: 1) Bat 2) Bee 3) Bird Which of the above is/are pollinating agent/agents?

All three are pollinators, so the answer is D. Pollination is the transfer of pollen from anther to stigma, and it is carried out by wind, water, insects and other animals. Animal pollination is called zoophily, and the three groups in this question are all examples of it.

• Bee (2): the classic insect pollinator. Bees visit flowers for nectar and pollen and carry pollen from one flower to another. This is entomophily.
• Bird (3): sunbirds in India and hummingbirds in the Americas pollinate red, tubular, nectar-rich flowers. This is ornithophily.
• Bat (1): fruit bats such as Pteropus pollinate night-blooming flowers like Bombax (silk cotton) and Kigelia. This is chiropterophily, and many tropical trees depend on it.

Core concept: pollinators and their role in ecosystem services, which sits under Environment and Ecology and links to Agriculture in GS-III. Mains angle: decline of pollinators due to pesticides and habitat loss threatens crop yields, which is why pollinator conservation appears in policy discussions.

Trap: the question asks for 'which of the above', so aspirants who think only of bees pick B. Vertebrate pollinators are easy to overlook, so check each option instead of relying on the most famous agent.