1 Biology Pg 5 Flashcards
(13 cards)
What is the structure of a generalised animal cell and plant cell as seen under a microscope?
Fig. 2.6 shows the structure of a generalised animal cell and of a generalised plant cell as seen under a compound microscope.
What are white blood cells and their movement?
White blood cells are amoeboid, meaning they have amoeba-like movement with pseudopodia, allowing them to squeeze out through capillary walls.
What are organelles in a cell?
Cell organelles are the ‘little organs’ of a cell, each with a definite shape, structure, and function, similar to organs in an animal or plant body.
What is the function of nerve cells?
Nerve cells are long and conduct impulses from distant parts of the body to the brain and vice-versa.
What is the function of muscle cells?
Muscle cells are long and contractile, enabling them to pull or squeeze parts.
What is the shape of guard cells in leaves?
Guard cells of stomatal pores in the leaves are bean-shaped to open and close the pore.
What surrounds each cell?
Each cell is surrounded by a cell membrane or plasma membrane.
What is the composition of the cell membrane?
The cell membrane is living and composed of lipoproteins, with fine pores that allow substances to enter or leave the cell.
What is the permeability of the cell membrane?
The permeability of the cell membrane is selective, allowing only certain substances to pass through while preventing others.
What surrounds the cell membrane in plant cells?
Plant cells have a cell wall surrounding the cell membrane, made of cellulose, a non-living substance.
What is the function of the cell wall?
The cell wall gives shape and a certain degree of rigidity to the cell without interfering with the functions of the cell membrane.
What are the three essential parts of a generalised cell?
A generalised cell consists of three essential parts: (1) cell membrane (plasma membrane), (2) nucleus, and (3) cytoplasm.
What is depicted in Fig. 2.6?
Fig. 2.6 shows a generalised animal cell and a generalised plant cell, highlighting parts common to both and parts exclusive to each.
