Why is external water not essential for fertilization in seed plants?
A. Ovules are contained within the pollen.
B. Pollen grains are transported by wind or an animal.
C. Sperm cells are used to transport pollen to the archegonia.
D. The sperm cells in seed plants are capable of resisting desiccation.
E. Seed plants use pollen instead of sperm for fertilization.
Answer: B
You might also like to view...
Imagine two species of birds with similar beak sizes and diets. Where the two species are allopatric, we would expect that their beak sizes
A. should be more different than when sympatric. B. should be more similar than when sympatric. C. should be larger than when sympatric. D. should be smaller than when sympatric. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about character displacement? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The energy expenditure of a mammal at rest, in the postabsorptive state, and at a standard temperature is referred to as its
A. basal metabolic rate. B. standardized metabolic rate. C. baseline metabolic rate. D. activated metabolic rate. E. total metabolic rate.
Woolly mammoths were determined to be more closely related to Asian elephants than to African elephants on the
basis of ____.
a. DNA sequencing of nuclear genes b. fossilized morphological evidence c. embryological evidence inferred from fossils d. mitochondrial and nuclear DNA sequences e. cytochrome c amino acid sequences
Kidney problems can arise from ____
a. viral infections b. gall stones c. arsenic or lead poisoning d. low protein diets e. high protein diets