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There can be multiple blocks of content attached to a task. E.g. One lesson might have several activities attached to it that the teacher can chose to use.
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At the data layer, there's a separation between the tree like structure of a curriculum (units, tasks, lessons, etc) and the content (title, subtitle, text, files, comments, etc). Thus, the title for a lesson, unit, task, etc is not stored with the task but with in the associated content model. Admittedly, this might seem odd without some examples.
Here's a link to the page the data comes from. https://picasaweb.google.com/lh/photo/9wpUGQbkyLMdoHYmdwJ7aywCjj2nyFTI8W1fOzXNYUQ?feat=directlink