Daily NEET MCQ- September 12, 2022 - NEET MCQ

In sublimation, the solid substance transforms directly to the vapor state without entering into the liquid state. This helps in separating sublimable compounds from non-sublimable ones. Whereas the other three, i.e. crystallization, distillation and differential extraction are used when a suitable solvent is involved. In other words, they deal with mainly liquids and not solids alone.

When a compound is dissolved in water, solubility increases with increase in temperature. This is because, when the temperature increases, the kinetic energy also increases which in turn helps the solvent molecules to break apart the solute molecules more efficiently than in other cases. These solute molecules are held together by intermolecular interactions which requires greater energy to be broken off and hence, higher temperature.

A seperatory funnel is used in differential extraction. Differential extraction involves separating the immiscible organic compound from the aqueous solvent. The separating funnel aids in this process of separating immiscible liquids. It also helps in layer formation, with the denser solvent at the bottom and the other on top. This layer formation is important for the process, and thus, separatory funnel is chosen as the apparatus for differential extraction.

Beat frequency is equal to the difference between frequencies of interfering waves. In this case, beat frequency
= 6-2 = 4Hz.

As the initial beat frequency is 2Hz, the 2nd tuning fork can have a frequency of 98Hz or 102Hz. When wax is applied to the second tuning fork its frequency should decrease. On doing so the beat frequency has also increased, so the initial value of the frequency of the 2nd tuning fork must be lower than that of the first tuning fork.

Intensive properties are those which don’t depend on the amount of matter in the sample. For eg: temperature, pressure, density.

As leaves obtain minerals from soil directly, therefore, acts as a source for movement of minerals. Seeds, apical and lateral meristems and developing fruits and flowers act as sink for mineral elements.

Elements such as N, P and K get readily mobilized from older parts to younger ones before the death of the plant or before new growth appears. Ca, being a part of the structure of the cell wall and middle lamella does not move to the younger parts.

Ca is a part of structural component of the plant as it present in the cell wall, middle lamella and also required for formation of mitotic spindle. N and K are present in metabolically active cells. P is present in cell membranes, proteins, nucleic acids and nucleotides.

Control points or transport proteins are present in endodermal cells of the plant system. Root hairs arise from region of maturation of the root system. They help in increasing area for absorption. Epidermal cells and the cortical cells allow both apoplastic and symplastic pathway.