The key innovation that helped seed-bearing plants

survive in high, dry environments is
a. pollen.
b. the cuticle.
c. xylem.
d. phloem.
e. lignin.


Answer: a

Biology & Microbiology

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Consider the phylogeny (Fig. 34.15) below. Which type of data helped the most in constructing this tree?

A. fossils from the group Glomeromycetes B. morphological characters associated with fruiting bodies C. chromosome number of the different species D. molecular sequence data E. presence or absence of a continuous dikaryotic life stage

Biology & Microbiology

The letter "A" in the above figure represents

a. pericycle b. endodermis c. primary xylem d. root cortex e. primary phloem

Biology & Microbiology

Which of these are symbioses?

What will be an ideal response?

Biology & Microbiology

All of the following are endocrine hormones, EXCEPT:

A) histamine. B) insulin. C) adrenaline. D) thyroxine.

Biology & Microbiology