SCIENCE CLASS 8, CHAPTER-CELL plz Help i will mark brainliest and you will get 30 points
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Answer:
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1)Cell is the basic structural and functional unit of life
2) selectively permeable membrane
3) made of cellulose. function to provide rigidity and shape to the cell.
4) it helps in photosynthesis and provide colour to the parts of plant.
5) prokaryotes are organism that don't have nucleus membrane whereas eukaryotes have nucleus membrane in the cells.
Explanation:
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Answer:
E 1. A cell is capable of carrying out all the life functions; such as nutrition, excretion, respiration, etc. Hence a cell is called the functional unit of life.
2.Selectively membrane
3.A cell wall is a rigid, semi-permeable protective layer in some cell types. This outer covering is positioned next to the cell membrane (plasma membrane) in most plant cells, fungi, bacteria, algae, and some archaea.
The cell wall has many important functions in a cell including protection, structure, and support.
4.Chloroplasts are the sites for photosynthesis, which comprises a set of light-dependent and light-independent reactions to harness solar energy and convert it into chemical energy.
5.Prokaryote vs eukaryote: key differences
Prokaryote Eukaryote
Nucleus. Absent Present
Membrane-bound organelles
Absent. Present
Cell size Smaller (0.1-5 μm) Larger (10-100 μm)
Complexity Simpler More complex
DNA Form Circular. Linear
F. 1. Cells were discovered by Robert Hooke. In 1665, the English scientist Robert Hooke observed slices of cork (bark of tree) which is part of bark of a tree, under a simple magnifying device. He noticed partitioned boxes or compartments in the cork slice.
2. The nucleus consists of the following main parts:
(1) Nucleolemma or nuclear membrane (karyotheca) (2) Nuclear sap or karyolymph or nucleoplasm (3) Chromatin network or fibres (4) Nucleolus (5) Endosomes.
3. Cells are considered the basic units of life in part because they come in discrete and easily recognizable packages. That's because all cells are surrounded by a structure called the cell membrane — which, much like the walls of a house, serves as a clear boundary between the cell's internal and external environments.
4.The plastid is a membrane-bound organelle found in the cells of plants, algae, and some other eukaryotic organisms.
5.Plant Cell Animal Cell
Cell Shape
Square or rectangular in shape; Irregular or round in shape
Cell Wall
Present Absent
Plasma/Cell Membrane
Present. Present
Endoplasmic Reticulum
Present. Present
Nucleus
Present and lies on one side of the cell ;Present and lies in the centre of the cell
Lysosomes
Present but are very rare. Present
6. In permanent slide the organisms is killed and attached them to the slide. ... Temporary slide contains living cells or organisms.
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