Assertion: Clones are produced by sexual reproduction.
Reason: These are prepared by a group of cells descended from many cells or by inbreeding of a heterozygous line.

Examine the figures $A, B, C,$ and $D$ given below and select the right option for female sex organs.

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

........ and ........ are examples showing external fertilization.

Study the following statements and choose the correct option:
$I$. Asexual reproduction is common among single-celled organisms and organisms with relatively simple organization.
$II$. Conidia,bud,and gemmules are common sexual structures.
$III$. Runner,rhizome,sucker,tuber,offset,and bulb are vegetative propagules.
$IV$. The invasive weed found growing in freshwater bodies is $Zostera$.

Which of the following statements is incorrect?
$(i)$ Bamboo species flower only once in their lifetime,generally after $50-100$ years,produce a large number of fruits,and die.
$(ii)$ In animals,the juvenile phase is followed by morphological and physiological changes prior to active reproductive behaviour.
$(iii)$ The reproductive phase is of the same duration in all organisms.
$(iv)$ The juvenile phase is the period of growth between the birth of an individual until it reaches reproductive maturity.