Given below is the age pyramid for Hungary. Which type of growth does it represent?

Which one of the following population attributes contributes to an increase in population density?

Select the correct option based on the number and size of offspring produced by the following organisms:
$I -$ Oysters,$II -$ Birds,$III -$ Pelagic fishes,$IV -$ Mammals
(Many small-sized offspring) $\quad$ (Few large-sized offspring)

In a population,there are $100$ small-sized Parthenium plants and only $1$ large-sized Banyan tree. Which of these has a lower population density?

Information on birth-rate,death-rate,sex-ratio,and age distribution of a population can be obtained from:

Ecological age groups of a population are:
$I.$ Pre-reproductive
$II.$ Reproductive
$III.$ Post-reproductive
$IV.$ Old-age group
$V.$ Adolescent age group
$VI.$ Infertile age group
Choose the correct option for the given statements.