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Class 8 Science Study Material

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Cell Structure and Function

The structure responsible for the transfer of characters from the parents to next generation is

a) Chromosomes.
b) Lysosomes.
c) Mitochondria.
d) Plastid.

✔Answer

✔Solution

Correct Answer Is : Chromosomes.

Solution Is : Chromosomes transfer the characters from parents to the next generation. Mitochondria provide the energy to the cell for carrying out various activities. Lysosomes are another cell organelle, which contains digestive enzymes. Plastids are the largest cell organelle containing pigments and are present only in plant cell.

The largest organelle present in the plant cell is

a) Mitochondria.
b) Plastid.
c) Vacuole.
d) Nucleus.

✔Answer

✔Solution

Correct Answer Is : Plastid.

Solution Is : Plastids are the largest cell organelle present only in plant cells. They are of three types; chloroplast, chromoplast and leucoplast.

The colour that chloroplast gives to a plant is

a) Red.
b) Yellow.
c) Green.
d) Brown.

✔Answer

✔Solution

Correct Answer Is : Green.

Solution Is : Chloroplast contains green coloured pigment called chlorophyll, which helps the plants to prepare food during photosynthesis.

Select the false statementfrom the given

a) The outermost layer in
b) Activities of the cell is controlled by nucleus.
c) 90% by weight, protoplasm is made up of compounds of elements carbon, oxygen, nitrogen and hydrogen.
d) Plastids are found in both animal as well as plant cells.

✔Answer

✔Solution

Correct Answer Is : Plastids are found in both animal as well as plant cells.

Solution Is : Protoplasm consists of the compounds of four major elements namely carbon, which is the most abundant, hydrogen, oxygen and nitrogen. Cell wall is present only in plant cell and is the outer most layers outside the cell membrane. Nucleus is the centre of the cell controlling all the cellular activities. Plastids are coloured pigments responsible for the colour of leaf, flower and fruit in plants.

The organelle found in a cell, which is rod-shaped or spherical in shape is

a) Mitochondria.
b) Chromatin.
c) Nucleus.
d) Plastid.

✔Answer

✔Solution

Correct Answer Is : Mitochondria.

Solution Is : Mitochondria is also called the powerhouse of the cell. They are rod shaped or spherical in shape. They provide energy to the cell for various activities.

Droplets of substances dissolved in water in the cytoplasm which appear as empty spaces are called

a) Mitochondria.
b) Nucleus.
c) Vacuoles.
d) Chromatids.

✔Answer

✔Solution

Correct Answer Is : Vacuoles.

Solution Is : Mitochondria are the energy giver of the cell. Nucleus controls all the activities of the cell. Chromatids are the materials that transfer the hereditary information from the parents to the next generation.

The largest vacuoles can be found in

a) Amoeba.
b) Plants.
c) Plants and animals.
d) Bacteria.

✔Answer

✔Solution

Correct Answer Is : Plants.

Solution Is : Plant cells have larger and fewer vacuoles than the animal cells.

Different tissues join to form a

a) Cell.
b) Organ.
c) Organ system.
d) Organism.

✔Answer

✔Solution

Correct Answer Is : Organ.

Solution Is : Cells join together to form a tissue; different tissues join together to form an organ. Organs are specialized to perform specific functions. These organs join to form the organ system and several organ systems together form an organism.

A cell membrane is selectively permeable which means

a) It allows free passage to all substances.
b) Allows some substances to enter preventing others.
c) Does not allow any substance to enter.
d) Does not allow any substance to leave.

✔Answer

✔Solution

Correct Answer Is : Allows some substances to enter preventing others.

Solution Is : A cell membrane is selectively permeable. This means that it allows only selected substances to pass through it, while prevents the entry of other substances.

Tomato is red due to presence of

a) Chloroplast.
b) Vacuole.
c) Plastid.
d) Cell wall.

✔Answer

✔Solution

Correct Answer Is : Plastid.

Solution Is : The red colour of a tomato is imparted due to the presence of red coloured pigment present in the plastids.

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Class 8 Science Study Material

Cell Structure and Function

The structure responsible for the transfer of characters from the parents to next generation is

Correct Answer Is : Chromosomes.

The largest organelle present in the plant cell is

Correct Answer Is : Plastid.

Solution Is : Plastids are the largest cell organelle present only in plant cells. They are of three types; chloroplast, chromoplast and leucoplast.

The colour that chloroplast gives to a plant is

Correct Answer Is : Green.

Solution Is : Chloroplast contains green coloured pigment called chlorophyll, which helps the plants to prepare food during photosynthesis.

Select the false statementfrom the given

Correct Answer Is : Plastids are found in both animal as well as plant cells.

The organelle found in a cell, which is rod-shaped or spherical in shape is

Correct Answer Is : Mitochondria.

Solution Is : Mitochondria is also called the powerhouse of the cell. They are rod shaped or spherical in shape. They provide energy to the cell for various activities.

Droplets of substances dissolved in water in the cytoplasm which appear as empty spaces are called

Correct Answer Is : Vacuoles.

Solution Is : Mitochondria are the energy giver of the cell. Nucleus controls all the activities of the cell. Chromatids are the materials that transfer the hereditary information from the parents to the next generation.

The largest vacuoles can be found in

Correct Answer Is : Plants.

Solution Is : Plant cells have larger and fewer vacuoles than the animal cells.

Different tissues join to form a

Correct Answer Is : Organ.

Solution Is : Cells join together to form a tissue; different tissues join together to form an organ. Organs are specialized to perform specific functions. These organs join to form the organ system and several organ systems together form an organism.

A cell membrane is selectively permeable which means

Correct Answer Is : Allows some substances to enter preventing others.

Solution Is : A cell membrane is selectively permeable. This means that it allows only selected substances to pass through it, while prevents the entry of other substances.

Tomato is red due to presence of

Correct Answer Is : Plastid.

Solution Is : The red colour of a tomato is imparted due to the presence of red coloured pigment present in the plastids.

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