Leaves
6. a student placed a test tube containing elodea (an aquatic plant) and pond water 10 cm from a
source. he observed that the plant wave off bubbles of a gas and counted how many bubbles were
released in one minute. he moved the plant farther away from the light source to see if distance from
the source made a difference. the data table below shows his results.
light source
gas production
distance from light bubbles produced
(cm)
per minute
10
40
20
30
30
7
404
the gas that was being produced was most likely
a) carbon dioxide as a product of the process of respiration
b) carbon dioxide as a product of the process of photosynthesis
c) oxygen as a product of the process of respiration
d) oxygen as a product of the process of photosynthesis

Lola needs to sign 6 invitations. using stopwatch that measures time to tenths of a second, it takes lola 5.3 seconds to sign her full name. going by the accuracy of the stopwatch, which is the most accurate determination for the number of minutes lola needs to sign all 96 invitations

Rease is an enzyme used by plants to break down urea (a nitrogen-containing compound) into carbon dioxide and ammonia. urease urea > > > carbon dioxide and ammonia ammonia is broken down by plants into a nitrogen source plants need to grow. thus, plants could not use urea as a nitrogen source unless it was first converted to ammonia. in soybean plants there are two different kinds of urease, one produced in the seeds and the other produced in the leaves of the plant. three types of soybean plants were used in a set of experiments: normal soybeans and two mutant strains, one lacking the urease in the seeds only (strain 1) and one lacking urease in the leaves only (strain 2). experiment 1 separate areas in a field were planted with normal, strain 1, and strain 2 soybeans. all types of soybeans appeared to grow, flower, and produce seeds equally well. there were no externally detectable differences among the strains. experiment 2 small pieces of plant leaves of equal weight were obtained from each type of soybean plant and separately placed on media in culture dishes. tissue growing in this way will become an unorganized clump of cells referred to as callus. to provide a controlled nitrogen source, half the tissue samples of each type were placed on media containing urea, and the other half of the samples were placed on media containing ammonia. after 30 days, the weight gain for each of the callus samples was determined. results are shown in the table below.

What in scientific term why the salty popcorn causes this thirst