List of top Science Questions on Biology

Given below is a pyramid showing various trophic levels in an ecosystem:

(a) From the organisms listed below, identify which one is to be placed at which trophic level:
Deer, Grass, Lion, Snake, Rabbit
(b) Discuss the reason why primary consumers will have more energy as compared to secondary consumers?
(c) Why is the base of the pyramid broad?

Which structure in a leaf is mainly responsible for gaseous exchange?

Plants use variety of techniques to get rid of their waste materials. Some are mentioned below. Identify the incorrect one:

From the given situations, identify 'Chemotropic' and 'Geotropic' movements in parts of plants, respectively:
(i) Growth of pollen tube towards ovule.
(ii) Movement of sunflower towards sunlight.
(iii) Movement of root towards Earth/Gravity.
(iv) Movement of leaves due to breeze.