Zoospore,Conidia,Tuber,Offset,Pollen,Zygote. From the structures given in the above box,how many are not associated with asexual reproduction?

In fungi and plants,the bisexual condition is represented by $P$ and the unisexual condition is represented by $Q$. Choose the correct option for $P$ and $Q$.
$P \quad\quad Q$

Select the correct option from Column-$I$ and Column-$II$.

Column-$I$	Column-$II$
$(A)$ Asexual reproduction in Spirogyra	$(p)$ Mycobiont
$(B)$ Vegetative reproduction in Yeast	$(q)$ By zoospores
$(C)$ Fungal component in Lichen	$(r)$ Perithecium
$(D)$ Asexual reproduction in Lichen	$(s)$ By spores
$(E)$ Flask-shaped fruiting body of Lichen	$(t)$ Phycobiont
	$(u)$ By budding
	$(v)$ Apothecium

In $Ophioglossum$ (a fern),the chromosome number in a gamete is ..... and in potato,the chromosome number in a gamete is ....

Reproduction is

The number of taxa exhibiting asexual reproduction is drastically reduced in higher plants (angiosperms) and higher animals (vertebrates) as compared with lower groups of plants and animals. Analyse the possible reasons for this situation.