Basic Science Solutions for Class 8 Science Chapter 2 The Cell are provided here with simple step-by-step explanations. These solutions for The Cell are extremely popular among class 8 students for Science The Cell Solutions come handy for quickly completing your homework and preparing for exams. All questions and answers from the Basic Science Book of class 8 Science Chapter 2 are provided here for you for free. You will also love the ad-free experience on Meritnation’s Basic Science Solutions. All Basic Science Solutions for class 8 Science are prepared by experts and are 100% accurate.

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The organisms that are made of only one cell are called unicellular organisms.
Example: Algae

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We stain specimens before viewing them under a microscope because staining highlights the different parts of the specimens and makes them distinguishable.

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Four types of animal tissues are:

(a) Epithelial tissue
(b) Connective tissue
(c) Muscular tissue
(d) Nervous tissue

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A vacuole is a sac-like structure that stores food, water and waste. Plant cells have larger vacuoles than animal cells.

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Chloroplast is expected to be present in the cells of green plants. It contains the green pigment, chlorophyll, which is responsible for photosynthesis.

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A cell is known as the structural and functional unit of life because it constructs the body of an organism and is responsible for carrying out all the functions of both unicellular and multicellular organisms.

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Different types of plastids are:

(a) Chloroplast:
It contains a green pigment, chlorophyll, which is responsible for photosynthesis.
(b) Chromoplast:
It contains different coloured pigments that provide different colours to fruits and flowers.
(c) Leucoplast:
It is found in the storage organs of plants and is involved in food storage.

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Vascular bundles are made up of  the xylem and the phloem tissues.
The xylem tissue is responsible for transporting water and minerals from root to different parts of the plant.
The phloem tissue is responsible to transport food from leaves to all the parts of the plant.

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Nucleus is called the control room of the cell because it controls all the activities of the cell. It contains DNA that orders the cell to perform all its functions. DNA is responsible for transferring hereditary characters from parents to the progeny.

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The plasma membrane is called selectively permeable because it allows specific substances to pass through it and blocks the entry of unwanted things into and out of the cell.
Example: It allows oxygen and nutrients to enter the cell and waste material to leave the cell. It blocks the entry of germs into the cell.



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Plant cells Animal cells
Cell wall is present in plant cells. Cell wall is absent in animal cells.
Plastids are present in plant cells. Plastids are absent in animal cells.
Vacuoles are large in size and occupy most of the space of the cell. Vacuoles are very small in size.

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Different regions that are seen in a transverse section of a dicotyledonous stem are as follows:

(a) Epidermis: It is the outermost region formed by epidermal cells. It is a protective tissue that is present in stems, roots and leaves.
(b) Vascular bundles: These are made up of xylem and phloem tissues that are arranged in the form of a ring. They are responsible for the transport of water, minerals and food in the plant.
(c) Ground tissue: It comprises of different zones (tissue) and constitutes the major part of stem. Cortex and pith are two zones of ground tissue. Cortex is the part that extends from the epidermis up to the vascular bundles and pith is the central core of the cell. Both of them are involved in food storage.

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(a) epithelial cell

Cheek cells are protective epithelial cells.

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(c) in roots, stems and leaves

Vascular bundles are found in roots, stems and leaves of plant cells.

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(d) cellulose

Cellulose is present in the cell walls of the plant cells.

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(b) connective tissue

Blood is a type of connective tissue.

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(a) nervous tissue

Brain and spinal cord are made up of nervous tissue.

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(d) do not have a nucleus

Red blood cells do not have a nucleus.

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1. The dense tangle of chromosomes inside the nucleus is called chromatin.
2. Chromosomes carry genes that pass on hereditary characters.
3. The thin-walled oval cells extending from the epidermis to the vascular bundles form the cortex.
4. The matrix in which blood cells are suspended is called plasma.
5. A microscope has two lenses called the objective and the eyepiece.



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