Q141
Which one of the following has its own DNA?
Correct Answer
Option B
Solution
Mitochondria has its own DNA.
It is a structure within cytoplasm of eukaryotic cells that carries out aerobic respiration.
Cell: The Unit of Life
Q142
The main area of variuos types of activites of a cell is –
Correct Answer
Option A
Solution
Cytoplasm is granular, crystallo-colloidal complex that forms the living protoplasm of a cell excluding its nucleus.
Q143
Which one of the following structures between two adjacent cells is an effective transport pathway?
Correct Answer
Option B
Solution
Plasmodesmata are the structures present between two adjacent cells that permits the transport and communication between them.
Q144
Plasmodesmata are :
Correct Answer
Option B
Solution
Plasmodesmata are connections between adjacent cells.
Plasmodesmata are narrow channels that act as intercellular cytoplasmic bridges to facilitate communication and transport of materials between plant cells.
Q145
Cytoskeleton is made up of :
Correct Answer
Option B
Solution
The ability of eukaryotic cells to adopt a variety of shapes and to carry out coordinated and directed movements depends on the cytoskeleton.
The main proteins that are present in the cytoskeleton are tubulin, actin, myosin, tropomyosin and others.
Q146
Middle lamella is composed mainly of :
Correct Answer
Option A
Solution
Middle lamella is mainly composed of calcium pectate. Calcium pectate is like a glue binding adjacent cells together.
Q147
In germinating seeds fatty acids are degraded exclusively in the:
Correct Answer
Option C
Solution
In germinating seeds, fatty acids are degraded exclusively in the glyoxysomes.
Glyoxylate cycle occurs in tissues rich in fats, such as those of germinating seeds.
Q148
Keeping in view the fluid mosaic model for the structure of cell membrane, which one of the following statements is correct with respect to the movement of lipids and proteins from one lipid monolayer to the other (described as flipflop movement)?
Correct Answer
Option B
Solution
According to fluid mosaic model there is rapid internal motion involving flexing within each lipid molecule a rapid lateral diffusion of the lipids is possible and a slow flip-flop motion of lipid molecules from one side of the bilayer to the other is also possible.
Q149
Vacuole in a plant cell:
Correct Answer
Option B
Solution
In a plant cell, vacuole may be defined as a non-living reservoir, bounded by a differentially or selectively permeable membrane, the tonoplast.
It is filled with a highly concentrated solution called vascular sap.
Q150
A student wishes to study the cell structure under a light microscope having 10X eyepiece and 45X objective. He should illuminate the object by which one of the following colours of light so as get the best possible resolution ?
Correct Answer
Option C
Solution
Resolution of microscope is inversely proportional to wavelength of light used.
Out of four options given, blue light has minimum wavelength and hence maximum resolution.
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