ch cell and its function and structure class 8th dav extra question.plz if anybody have
Answers
Cell Structure and Functions Class 8 Extra Questions Very Short Answer Questions
Question 1.
What is the basic, functional and structural unit of life?
Answer:
Cell
Question 2.
Which cell does not have nucleus?
Answer:
Red blood cell
Question 3.
What is the name of the organism which can be seen only with the help of microscope?
Answer:
Microorganisms
Question 4.
What are the organisms which are composed of many cells packed together called?
Answer:
Multicellular organisms
Question 5.
What is the name of the power house of the cell?
Answer:
Mitochondria
Question 6.
Name one example of prokaryotic cell.
Answer:
Blue-green algae
Answer:
What is the function of cell wall?
Answer:
Cell wall is a tough, rigid layer that surrounds some types of cells (plants and some bacterial cells). The major function of the cell wall is to provide rigidity, tensile strength, structural support, protection against mechanical stress and infection.
Question 2.
Name the parts of the nucleus and state its function.
Nucleus consists of three main parts—nuclear membrane, nucleoplasm and nucleolus. Nucleus plays an important role during cell division. It also controls the activities of the cell.
What is an organ?
Answer:
The structure that contains more than one type of tissues and is visible to the naked eyes are called organs.
Question 4.
What do you mean by unicellular and multicellular organisms?
Answer:
Organisms which consists of only one cell are called unicellular organisms while the organisms made up of more than one cell are called multicellular
Give a brief description of nucleus.
Answer:
Nucleus is a dense round body found in the centre of an animal cell and mostly on the periphery of the plant cell. The nucleus controls all the activities in a cell.
Question 6.
Name the following:
Controls the function of a cell.
Selectively allows things to get in and out of the cell.
Transfer characters from parents to offsprings.
Nucleus
Cell membrane
Genes
Question 7.
What is nucleolus?
Answer:
A spherical body present at the centre of the nucleus is called the nucleolus.
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