1) What is the advantage of very long and branched nerve cell?
2) Name two cell organelles that have their own DNA and ribosomes?
3) What is the outer covering of a vacuole known as?
4) Draw a well labelled diagram of Mitochondria.
5) Why do plant cells have large central vacuole?
6) What do you mean by Membrane Biogenesis?
7) How does endoplasmic reticulum help in formation of new cell membrane? Explain its two
types.
8) State any two functions of Golgi bodies.
9) Give reasons for the following:
a) Mitochondria are called the powerhouse of the cell
b) Nucleus is the control room of the cell.
c) Plastids are the food factory of a plant cell.
10) Classify the plastids into its types and mention their location and function in a plant.
11) What will happen to the cell if its nucleus is removed?
12) Which organelle helps in detoxifying poisons and drugs?
13) An animal cell like amoeba shows endocytosis but a plant cell cannot. Explain the reasons.
14) Describe the structure and function of a nucleus with the help of a diagram.
15) State the role of cytoplasm.
16) Differentiate between prokaryotic and Eukaryotic cell. (Write any three points).
17) State one point of difference between nucleoid and nucleus.
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Answers
no 1 is for 1st question
Nerve cells are usually branched and very long as they need more surface area to transmit the signals. Due to their long size they can easily carry messages in each and every portion around the body.
The eukaryotic cell organelles that possess their own DNA and ribosomes are only chloroplast andmitochondria. They have 70S ribosomes and single circular chromosome just like prokaryotes.
tonoplast
The outermost covering of vacuole is called as tonoplast or vacuolar membrane. The tonoplast is the cytoplasmic membrane separating the vacuolarcontents from the cell's cytoplasm
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Plant cells have a large vacuole due to the amount of water the cell must hold to maintain its shape. The water in the vacuolecreates something called Turgor Pressure. When thevacuole has lots of water, the Turgor is high and pushes against the cellwall so the cell is rigid.
6. Membrane biogenesis is the process which involves the synthesis of cell membranewith the help of proteins and lipids. Endoplasmic reticulum is responsible for the synthesis of these membranes. ...Membranes of the cell altogether are called as
7. Alternative Title: ER
Endoplasmic reticulum (ER), in biology, a continuous membrane system that forms a series of flattened sacs within the cytoplasm of eukaryotic cells and serves multiple functions, being important particularly in the synthesis, folding, modification, and transport of proteins . All eukaryotic cellscontain an endoplasmic reticulum (ER). In animal cells, the ER usually constitutes more than half of the membranous content of the cell. Differences in certain physical and functional characteristics distinguish the two types of ER, known as rough ER and smooth ER.
8 . The Golgi body has a number of functions, including sorting and processing proteins. Proteins are synthesized in the rough endoplasmic reticulum, then they travel to the Golgi body. While in the Golgi body, they are processed and sent throughout the cell.
9.1 Mitochondria (sing. Mitochondrion) are known as the powerhouse of the cellbecause they are responsible for the release of energy from food ,i.e, cellular respiration. This energy is released in the form of ATP (adenosine triphosphate), the energy currency of the cell.
9.2The nucleus is considered the controlcenter of the cell because it contains thecell's genetic information, or DNA.
9.3 Plastids contain a pigment called chlorophyll, which is basically used by theplant cells to prepare their own food by the process of photosynthesis. That is why they are called kitchen of the cell.
10. Types and Functions of Plastids
The chloroplast is filled with thylakoids, which is where photosynthesis occurs, and chlorophyll. Chromoplasts are what the name describes, a place for the pigments to be stored and synthesized in the plant. ... Leucoplasts are the non-pigmented organelles.