What is the reason for the ground surface becoming slippery during the rainy season?

In which of the following is meiosis not seen?

Which category includes the most abundant prokaryotes,which are useful in making curd from milk and in the production of antibiotics?

Which of the following statements is consistent with Halophiles?

The most abundant prokaryotes helpful to humans in making curd from milk and in production of antibiotics are the ones categorized as

Assertion $A$: Bacillus and Coccus types of bacteria are found in colonial forms.
Reason $R$: In bacteria,cells formed by cell division remain surrounded by a secreted mucilaginous substance.
Which option is correct for Assertion $A$ and Reason $R$?