Linnaeus's classification was primarily based on ............ .

Which of the following is the only taxonomic category that has a real existence?

Match the following organisms with their scientific names,orders,and families:

Common Name	Scientific Name	Order	Family
$a$. Earthworm	$p$. Rana tigrina	$w$. Glumiflorae	$1$. Poaceae
$b$. Sunflower	$q$. Zea mays	$x$. Anura	$2$. Asteraceae
$c$. Frog	$r$. Pheretima posthuma	$y$. Opisthopora	$3$. Megascolecidae
$d$. Maize	$s$. Helianthus annuus	$z$. Asterales	$4$. Ranidae

Which of the following taxonomic categories is being described by the given statements $(i-iii)$?
$(i)$ It is the basic unit of classification.
$(ii)$ It is defined as the group of individuals which resemble in their morphological and reproductive characters and interbreed among themselves and produce fertile offspring.
$(iii)$ Human beings belong to the species $sapiens$ which is grouped in the genus $Homo$.

Which of the following characters given below displays the description of the lowest taxonomic category of organisms in the plant and animal kingdom?

What is a $Holotype$?