Which organism can change its sex?

Which of the following statements is $NOT$ true regarding the $F_{1}$ generation plants obtained by crossing pure tall and pure dwarf pea plants?

What are sex chromosomes? Which sex chromosomes are found in male and female human beings? State the chromosome responsible for the development of a male child in human beings?

Give the pair of contrasting traits for the following characters in a pea plant and mention which is dominant and which is recessive:
$(i)$ Yellow seed
$(ii)$ Round seed

Which type of animals were the Dinosaurs having feathers?

Does geographical isolation of individuals of a species lead to formation of a new species? Provide a suitable explanation.