Answer: Correct options are A, C and D
A. a forest because it has more trees to provide plant litter
C. a forest because it has more animals to mix the soil
D. a forest because the trees prevent rain from reaching the soil
Explanation:
Humus simply refers to organic matter, and the quantity of organic matter in a habitat depends on the extent of life activities done there.
Deserts, unlike forests have minimal life activities (as few plants and animals thrive in it). Thus, forests have more humus than deserts.
Humans have approximately 24,000 genes, but fruit flies are not far behind, with approximately 14,000 genes.
3-PGA is the important metabolic intermediate in light independent reactions of photosynthesis.
PGA
<u>Explanation:</u>
Light-independent reaction in photosynthesis is called Calvin cycle and the reaction doesn’t directly require sunlight. But it still needs the products of light reaction. In light-independent reaction carbon dioxide is fixed from inorganic form into an organic form.
In the fixation each molecule of carbon dioxide reacts with RuBP and forms two molecules of 3-PGA at a time. The reaction is catalyzed by the enzyme RuBisCO. Since 3 molecules of RuBP are involved a total of 6 molecules of 3-PGA will be formed in fixation.
Here the 3-PGA is the intermediate and in the next stage it will get reduced to G3P(Glyceraldehyde -3 phosphate).
<span>Precession occurs when the earth's axis changes direction over time caused by the gravitational pulls of the sun and the earth.
Obviously, there are gravitational pulls between the sun, the moon, and the earth. These gravitational pulls affect earth in such a way that it slightly changes its axis, which leads to precession. Precession is the term which refers to such a change in the orientation of a body, in this case, the earth.</span>
