What do you mean by plasmodesmata?
Due to the presence of cell wall the exchange of materials between the plant cells is not possible. Therefore, protoplasts of plant cells are connected by cytoplasmic channels through their…
Why are peroxisomes mostly found in kidney and liver cells?
Peroxisomes contain various oxidative enzymes which detoxify the toxic material. Since the blood carries various toxic substances to kidney and liver, a large number of peroxisomes are present in them…
What are secretory proteins? Give an example of secretory protein.
Proteins which are synthesised by the cell and then released into outer medium of the cell are called secretory proteins. Examples of secretory proteins include mucus, digestive enzymes and hormones.
What is cytosol and cytoskeleton?
Cytosol is the semifluid part of the cell cytoplasm which is embedded in between cell organelles. Cytoskeleton is a network of protein fibres present in the cell which provides a…
What is cell sap? Give its composition.
Liquid content in the vacuoles of plant cell is called cell sap. The cell sap contains sugars, amino acid, proteins, minerals and metabolic wastes.
what are the functional regions of a cell?
There are three major functional regions of cells: (i) cell membrane or plasma membrane, (ii) nucleus and (iii) cytoplasm.
Why is the Golgi apparatus called the secretary organelle of the cell?
This is because it packages material synthesised in the ER and dispatches it to intracellular (plasma membrane and lysosomes) and extracellular (cell surface) targets.
There would be no plant life if chloroplasts did not exist. Justify.
Chloroplasts contain the pigment chlorophyll which is responsible for food preparation in plants by the process of photosynthesis. Hence, if there were no chloroplasts then there would not have been…
Why were the scientists not able to observe most of the cell organelles before 1940?
Before 1940, scientists could view the cell only under a light microscope. The invention of the electron microscope in 1940 enabled the scientists to observe the cell in greater detail.
What is a cell wall and how is it formed?
Cell wall is non-living and freely permeable rigid structure bounding the plant cell. It is secreted by the cell itself for the protection of its plasma membrane and cytoplasm.