Answer: Option C is false.
Archaea are not multicellular but they are unicellular.
Explanation:
Archaea are unicellular, microscopic organisms and have similar structure with bacteria.
They are prokaryotes and do not have cell organelles and Nucleus but they have cell wall which lack peptidoglylcan.
They have membranes that enclose lipids. They are obligated anaerobes that live in environment with low oxygen like water and soil.
Examples include methane loving methanogens, halophiles( salt tolerant), thermophiles (heat tolerant ) and pschrophiles ( cold dwelling). They are mostly found in extreme environment.
Answer:
Option (d).
Explanation:
Karyotype may be defined as the process of the determining of the chromosome complement of the individual organism. The complete set of an organism's chromosome can be determined by karyotype.
The karyotype displays the each and every pair of homologous chromosome. The chromosomes are organised according to their shape and size. The abnormal chromosome can easily be determined by the karyotype.
Thus, the correct answer is option (d).
Answer:
(2) low power: 100 small pollen grains
high power: 25 large pollen grains
Explanation:
Compound light microscopes are devices used to greatly magnify objects. They have several objective lenses, a low-power lens magnifies 10 times (10X) the objects, and the high-power lens magnifies them 40 times (40X).
For that reason, when observing the pollen grains with the high-power lens the student will see them bigger than with the low-power lens. However, the field of view (the visible area through a lens) is reduced when a higher power lens is used, so fewer pollen grains will be seen.
The answer therefore is the option of higher number of pollen grains of small size for the low-power lens, and lower number of pollen grains of larger size for the high-power lens.
Hello,
concentration gradient<span> is the process of particles, which are sometimes called solutes, moving through a solution or gas from an area with a higher number of particles to an area with a lower number of particles. The areas are typically separated by a membrane.
correct me if i'm wrong!
But since concentration gradient is the process of particles, then </span><span>Sedimentation is the tendency for </span>particles<span> in suspension to settle out of the fluid in which they settle as individual </span>particles<span> and do </span>not<span> flocculate</span><span>
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Answer:
A healthy radish plant growing in a greenhouse is covered with a screen box that blocks sunlight. After 10 days, the mass of the plants has <u>decreased</u> because the rate of cellular respiration is <u>higher than</u> the rate of photosynthesis.
Explanation:
If a healthy plant would be covered with a screen box for a period of 10 days, the rate of photosynthesis would be decreased significantly. We know that a plant essentialy needs sunlight to perform photosynthesis. Further, when the photosynthesis is already stopped, the <u>cellular respiration would continue and the plant would loss most of its water content</u>. Ultimately, after a few days, the plant biomass would start decreasing as well. The period of 10 days is sufficient enough to see the loss of plant biomass and decrease in photosynthesis rate. Normally, results are evident after 24 hours.
