The pollen tube grows from the ________ to the ________

a. sperm / stigma
b. ovule / anther
c. stigma / ovule
d. anther / sperm


c

Biology & Microbiology

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Why is terrestrial productivity higher in equatorial climates?

A) Productivity increases with temperature. B) Productivity increases with water availability. C) Productivity increases with available sunlight. D) The answer is most likely a combination of the other responses.

Biology & Microbiology

If all functional groups are removed from an organic molecule, leaving only a hydrocarbon chain, the molecule becomes a:  

A.  Lipid B.  Carbohydrate C.  Protein D.  Nucleic acid

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Which of the following statements about the distal convoluted tubule is false?

A. The filtrate entering the tubule is hypertonic relative to the interstitial space. B. Urea is the principal solute found within the filtrate in the distal convoluted tubule. C. Other wastes from the bloodstream are actively secreted into the distal convoluted tubule. D. The distal convoluted tubule delivers filtrate to the collecting duct. E. None of these statements about the distal convoluted tubule is false.

Biology & Microbiology

Place the following digestive structures of an Annelid in the proper order

a. mouth ? esophagus ? crop ? gizzard ? intestine ? anus b. mouth ? esophagus ? intestine ? crop ? gizzard ? anus c. mouth ? esophagus ? gizzard ? crop ? intestine ? anus d. mouth ? esophagus ? crop ? intestine ? gizzard ? anus e. mouth ? esophagus ? intestine ? gizzard ? crop ? anus

Biology & Microbiology