Spring batch size hibernate jdbc

I have several scenarios that I think are a bit obscure from hibernate documenation .

Data class:

class HibernateDao {
      // ...

      @Transactional
      public void store(List<Object> batch) {
          for(Object o : batch) {
             hibernate.store(o);
          }
      }
}

Scenario 1

hibernate.jdbc.batch_size = 1

Q1 . What happens when called store(..)with a collection of items 10? Will there be 10 x 1 transactions or only one?

Scenario 2

hibernate.jdbc.batch_size = 10

Q2 : what happens when called store(..)with a collection of elements 1? Will it be immediately written to the storage, regardless of the batch_size property?

From the sleep mode documentation:

Hibernate disables JDBC-level package embedding transparently if you use an identifier generator

Q3 : what is classified as identify identifier generatorusing annotations @Idand @GeneratedValue(strategy = GenerationType.AUTO)?