Answer:
E
Explanation:
Phytochrome is an important pigment that regulates photomorphogenic aspects of plant growth and development such as seed germination, stem elongation, leaf expansion, formation of certain pigments, chloroplast development and flowering.
Phytochrome has two different chemical structures that are inter-convertible. The forms are named by the color of light they absorb maximally: Pr is a blue form that absorbs red light strongly (660nm) and Pfr is a blue-collar form that absorbs far-red light strongly (730nm). When each phytochrome form absorbs its respective photon, they change chemically into their complementary form.
N.B: In plants, Pfr is the physiologically active or signalling state.
In the dark, phytochrome is in the Pr (inactive) form because at night, Pfr slowly converts back to Pr (inactive form).
The biologically inactive form of phytochrome (Pr) is converted to the biologically active form (Pfr) under illumination with red light. Far-red light and darkness converts the molecule (Pfr) back to the inactive form. Although, it converts back to Pr, slowly in darkness
Answer:
2
Explanation:
I think that the answer is 2 because river deltas are formed when sediments are moved somewhere else in order to make the delta. So is there are areas of infertile rock soil it could be easily moved to make a delta
Answer:
The correct answer will be option-E
Explanation:
Hershey and Chase's experiment was performed to test whether DNA serves as the genetic material or protein.
To perform experiment they grew bacteriophage into radiolabeled phosphorus and sulfur compounds. The phosphorus is an integral part of the structure of DNA whereas proteins contain sulfur in their structure.
In the given condition if radiolabeled nitrogen is utilized then the experiment will fail as the structure of proteins also contains an amino group( NH₂) in their structure as well as DNA. The scientist will not be able to identify whether the DNA is the genetic material or protein.
Thus, option-E is the correct answer.
Answer:
Mollusca Phylum
Gastropoda class
Explanation:
The Mollusca Phylum is one of the most noticeable phyla that includes a wide variety of forms.
The ancestral Mollusca used to habit the pre-cambric oceans. It was bilaterally symmetrical, with a well-defined head that had tentacles and ocellus. Its ventral surface was plane and muscular, shaping a reptant foot. The dorsal surface was protected with a convex and oval shell.
The Gastropoda class is the richest class among all mollusks. This class experienced a characteristic torsion in their shell. This twist also involved the visceral mass, the mantle, and the mantle cavity. But by the time that this torsion occurred, the shell had already experienced a turn into a coil shape, which was then followed by its torsion.
The typical gasteropod´s shell is a conical structure composed of several tubular spirals containing the individual´s visceral mass. The biggest spiral ends as an opening from which the head and the food protrude.