In $Rhizopus$,tubular thread-like structures bearing sporangia at their tips are called:

$(i)$ Some organisms have the capacity of reproducing by using a single parent. Such organisms have a simple body structure.
$(a)$ What is this method called?
$(b)$ Name any four types of this method.
$(c)$ Give two examples of organisms using this method for reproduction.
$(ii)$ Identify the method of reproduction used by $Spirogyra$ and $Rhizopus$.

Reproduction is essentially a phenomenon that is not for the survival of an individual but for the stability of a species. Justify.

Mention any four ways of asexual reproduction.

Describe sexually transmitted diseases (STDs) and mention the ways to prevent them.

In the process of reproduction as used in $Spirogyra$,the organism splits itself into small pieces.
$(a)$ What is this process of reproduction called?
$(b)$ Will this type of reproduction be asexual or sexual reproduction? Answer with reason.
$(c)$ Is this process same as regeneration? Give reasons.