Yes, they are more common in family - centered and school - life genres. In family - centered anime, spanking might be used as a way to show parental discipline. For example, in anime that depict traditional Japanese families, it can be a way to show how parents correct their children's misbehavior.
It could go either way. A manga's popularity doesn't always guarantee a successful anime adaptation. Sometimes the adaptation might not live up to fans' expectations or might not be promoted well enough to gain wide attention.
An anime would usually be adapted from a novel by a company. However, there were other ways to adapt a novel into an anime, such as adapting a novel into a movie, a TV series, or an anime version of a novel produced by an independent production company.
The choice between the manga and anime of A Certain Magical Index is tricky. The manga offers more detailed panels and the reader's imagination takes over. The anime brings the story to life with motion and sound, but might have some adaptations. It really comes down to what you value more in your entertainment.
Well, the anime and the light novel of 'A Certain Magical Index' have some differences. The light novel can offer a more comprehensive view of the world - building. It has more room to develop the various factions, such as the Magic Side and the Science Side. In the anime, some plotlines might be simplified for the sake of time. But the anime does a great job in character design. The unique appearance of characters like Accelerator is very well - presented in the anime. Also, the voice acting in the anime adds another layer of charm to the characters that the light novel lacks.
The manga and anime have some similarities but also differences. The anime visualizes the story well but might leave out some minor details from the manga.