If the number of chromosomes in the nucellar cells of an angiosperm is $24$,what will be the number of chromosomes in the pollen grain,endosperm,and embryo,respectively?

Study the following statements and choose the correct option.
$I-$ Tapetum nourishes the developing pollen grains.
$II-$ Hilum represents the junction between ovule and funicle.
$III-$ In aquatic plants such as water hyacinth and water lily,pollination is by water.
$IV-$ The primary endosperm nucleus is triploid.

Which of the following statements is incorrect?

Which of the following animals is produced without fertilization?

$A$ - In plants,the end of the juvenile phase marks the beginning of the reproductive phase.
$R$ - In plants,the juvenile phase is also known as the vegetative phase.

Is there a relationship between the size of an organism and its life span? Give two examples in support of your answer.