The micrograph shows a buttercup (Ranunculus bulbosus) stem in transverse section. Region T has been highlighted to show more detail.

Bottlenose dolphins (Tursiops truncatus) inhabit almost all tropical and temperate oceans between $45^{\circ} \mathrm{N}$ and $45^{\circ} \mathrm{S}$. Over a two-year period, aerial surveys were carried out to investigate the seasonal distribution of these animals along the mid-Atlantic and eastern coastal waters of the USA. Sightings were recorded using a global positioning system (GPS) while flying parallel to the coast approximately 500 m offshore. The diagram below shows a map of the section of coast surveyed. The bar graph shows the seasonal data for summer and winter at the corresponding latitudes ( ${ }^{\circ} \mathrm{N}$ ). A total of 5431 bottlenose dolphins were sighted during these surveys.

A student set up a 20 -metre transect line along a rocky shore and measured the abundance of seven species of seaweeds (A-G) at 21 different sampling stations at fixed distances. The kite diagram represents the species abundance data across the 20 metres.

Psammonobiotus balticus belongs to a group of protists (unicellular eukaryotic organisms) that have a shell surrounding most of the cell, which provides shelter from predators. The graph shows the frequency of varying shell lengths in a population of P. balticus.

Hummingbirds eat flower nectar and small insects. To which nutritional group do they belong?

The pie chart shows the modes of nutrition of fungi in Huahu Lake wetland in China.

What is the most common mode of nutrition of fungi in this wetland?

How do methanogenic archaeans living in peat bogs obtain energy to survive?

Which category of organisms is correctly described by its method of nutrition and site of digestion?

Euglena is a unicellular organism that feeds on bacteria and uses $\mathrm{CO}_{2}$ as a carbon source. Which describes the nutrition of this organism?