A tomato plant was placed under a sealed bell jar and
exposed to light. Carbon dioxide containing radioac-
tive carbon was introduced into the bell jar as shown
in the following diagram. After an hour, the inlet
valve was closed. Later, the entire plant was removed
from the soil and cleaned by rinsing it in water,
A Geiger counter indicated radioactivity in the roots.
These roots were then dried and chopped into very
small pieces. The chopped roots were sprinkled into
an aquarium containing a very hungry goldfish that
was not radioactive.
Four days later, the fish was removed from the
aquarium and a tissue section of the fish was tested
with the Geiger counter. The counter indicated an
above-normal level of radioactivity in the fish tissues.
34. Which cycle is primarily being studied by means
of this investigation?
Radioactive CO2
Inlet valve
Light
Tomato plant
(1) oxygen
(3) nitrogen
(4) water
12 carbon

interphase

the period of cell growth when the cell synthesizes new molecules and organelles. the cell is not dividing and it constitutes the majority of the time spent in the cell cycle

prophase

changes occur in the nucleus and cytoplasm. the chromatin condenses to form structures (sister chromatids) visible with a light microscope and the mitotic spindle begins to form, but the nucleus is still in tact

prometaphase

the nuclear envelope fragments and the spindle microtubules attach to the kinetochores of the sister chromatids

metaphase

all the cell's duplicated chromosomes are lined up at an imaginary plane equidistant between the poles of the mitotic spindle

anaphase

begins when sister chromatids separate from each other and ending when a complete set of daughter chromosomes arrives at each of the two poles of the cell

telophase

the daughter nuclei form at the two poles of a cell

cytokinesis

the division of a cytoplasm to form two separate daughter cells. usually occurs during telophase during mitosis. this and mitosis make up to mitotic (m) phase of the cell cycle

i think the answer is c hope this