Explain three outbreeding devices.

Suryakant had banana plantation in his field. Quality of the fruit was excellent but the yield suffered due to infection of the plants by a virus. Suggest a fast and efficient method to get healthy and a large number of plants in the next generation without compromising on the existing quality. Justify the selection of your method.

Besides acting as ‘conduits’ for energy transfer across trophic levels, predators play other important roles. Justify.

After implantation interdigitation of maternal and fetal tissues takes place. Identify the tissues involved and justify their role.

Compare the two ecological pyramids of biomass given below and explain the situations in which this is possible. Also construct an ideal pyramid of energy if 200,000 joules of sunlight is available.