In the process of alternation of generations, a plant alternates between the sporophyte and gametophyte generations. Which type of plant spends about half of its life cycle in each generation?  

Which type of adult plant tissue has the ability to transform back into embryonic growth cells, such as happens when we propagate plants by cuttings?  

Which root structures increase the surface area for water and nutrient absorption?  

A plant’s first line of defense against parasites and predators is __________.  

What is the major function of sclerenchyma tissue?  

The pollen tube grows through primarily what structure?  

Which part of a flower carries the egg?  

The most abundant cells in plants (found in the flesh of fruit, the outer surface of young plants, and the photosynthetic cells) are the ______.  

The arctic fox, Alopex lagopus, is primarily white in the winter months, but mostly brown in the summer when it is warmer. What accounts for this phenomenon?

Sickle-cell disease in humans is an example of