What happens during asexual reproduction? no change in chromosome number

a change from diploid to haploid

a change from haploid to diploid

Name the plastid and pigment likely to be found in the cells of (a) petals of sunflower (b) ripe tomato.

What is thought to have caused the mass extinction at the end of the cretaceous period?

Why do leaves change color in the fall? green pigments break down and no longer mask the color of chlorophyll. chlorophyll breaks down and no longer masks the colors of other pigments. red- and yellow-colored pigments grow and mask green-colored chlorophyll. green-colored chlorophyll breaks down and turns red and yellow.