Atree is planted in a meadow.

after 20 years it has grown into a big tree, weighing 250kg more than when it was planted.

where do the extra 250 kg come from?

explain your answer as fully and scientifically as you can.

The model illustrates a process by which a substance is taken up by a cell

Aresearcher has developed two stains for use with seed plants. one stains sporophyte tissue blue; the other stains gametophyte tissue red. if the researcher exposes pollen grains to both stains, and then rinses away the excess stain, what should occur? a) the pollen grains will be pure red. b) the pollen grains will be pure blue. c) the pollen grains will have red interiors and blue exteriors. d) the pollen grains will have blue interiors and red exteriors.

What is the process of a new plant growing from its seed into a seedling? primary growth fertilization pollination germination