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Question 11 Mark
Which part of the cell contains organelles?
Answer
Cytoplasm is the part of cell which contains organelles such as mitochondria, ribosomes, golgi bodies, etc.
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Question 21 Mark
Indicate whether the following statements are True $(T)$ or False $(F)$. Unicellular organisms have one-celled body.
Answer
True.
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Question 31 Mark
Which instrument was essential for the study of cells?
Answer
Microscope was essential for the study of cells.
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Question 41 Mark
What are the units of inheritance in living organisms?
Answer
Gene is a unit of inheritance in living organisms.
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Question 51 Mark
What is the basic similarity among all the living organism (plants and animals)?
Answer
The basic similarity among all the living organisms is that they all are made up of cells.
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Question 61 Mark
Indicate whether the following statements are True $(T)$ or False $(F)$. Amoeba has irregular shape.
Answer
True.
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Question 71 Mark
Indicate whether the following statements are True $(T)$ or False $(F)$.
Muscle cells are branched.
Answer
False.
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Question 81 Mark
Name the spindle-shaped cells present in the human body.
Answer
The spindle-shaped cells present in the human body are muscle cells.
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Question 91 Mark
How is the outside of a plant cell different from that of an animal cell?
Answer
Plant cells differ from animal cells in having an additional layer around the cell membrane termed cell wall.
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Question 101 Mark
Which cells in the human body can contract (and relax)?
Answer
Muscle cells in the human body can contract and relax.
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Question 111 Mark
Name the scientist who observed a thin slice of cork through a microscope and coined the team ‘cell’.
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Question 121 Mark
Which part of a plant cell protects outside of the cell?
Answer
Cell wall protects outside to the plant cell.
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Question 131 Mark
Indicate whether the following statements are True $(T)$ or False $(F)$. The basic living unit of an organism is an organ.
Answer
False.
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Question 141 Mark
Which part of plant cell releases energy from food?
Answer
Mitochondria releases energy from food in the plant cell.
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Question 151 Mark
Which organism has the smallest cell?
Answer
Bacteria mycoplasma is the smallest cell measuring $0.1$ micrometer.
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Question 171 Mark
Name the outermost layer of an animal cell.
Answer
Plasma membrane is the outermost layer of an animal cell.
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Question 181 Mark
State an important characteristic of muscles cells.
Answer
A muscle cell is pointed at both ends and has a spindle shape.
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Question 191 Mark
Name an organism which has no definite shape, and it keeps on changing its shape.
Answer
Amoeba has no definite shape, and it keeps on changing its shape.
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Question 201 Mark
Name one cell which can be seen easily with naked eye and one cell which can be seen only through a microscape.
Answer
The bird’s egg are very large cell which can be seen easily with naked eye while bacterial cells are extremely small which can be seen only through a microscope.
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Question 211 Mark
Which cells transmit message between the brain and other parts of the body?
Answer
Nerve cell transmit message between the brain and other parts of the body.
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Question 241 Mark
Name the organelle of a plant cell where photosynthesis takes place.
Answer
Chloroplast is the organelle of a plant cell where photosynthesis takes place.
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Question 251 Mark
Read the following statements and write the appropriate term against each statement. Am like a policeman. I do not allow anything and everything to get in and out of the cell. Who am I?
Answer
Cell membrane is like a policeman which does not allow everything and anything into and out of the cell.
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Question 261 Mark
State whether the following statements are true or false: All the cells in our body are alike.
Answer
False.
Explanation: All the cells in our body exhibit variety of shapes and sizes so that they can perform different functions.
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Question 281 Mark
Name the animal cell which is long and has thread-like branches.
Answer
Nerve cell is a long and has thread like branches.
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Question 291 Mark
What causes the red colour in tomatoes?
Answer
Coloured plastid (Chromoplasts) gives the red colour in tomatoes.
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Question 321 Mark
Name the main parts of a cell.
Answer
The cell has three main parts:
$i.$ The cell membrane
$ii.$ Cytoplasm
$iii.$ The nucleus.
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Question 331 Mark
Which part of a cell controls all the activities of the cell?
Answer
Nucleus controls all the activities of the cell.
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Question 351 Mark
What parts are present only in plant cells?
Answer
The parts which are present only in plant cells are- Cell wall, chloroplasts and large vacuole.
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Question 371 Mark
Name a single cell (other than Ameoba cell) which can change its shape.
Answer
White blood cells present in human blood is a single cell (other than Ameoba cell) which can change its shape.
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Question 381 Mark
What is the function of chloroplasts in a plant cell?
Answer
Chloroplasts help in the synthesis of food by the process of photosynthesis.
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Question 391 Mark
Which of the two does not have a true nucleus: prokaryotic cell or eukaryotic cell?
Answer
Prokaryotic cell does not have a true nucleus.
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Question 401 Mark
Which part of the two has a large vacuole: a plant cell or an animal cell?
Answer
A plant cell has a large vacuole.
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Question 411 Mark
Which is the largest floating body generally in the center of a cell?
Answer
Nucleus is the largest floating body generally in the center of a cell.
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Question 431 Mark
Read the following statements and write the appropriate term against each statement. I transfer characters from parents to offsprings. Who am I?
Answer
Genes present on chromosomes transfer characters from parents to offsprings.
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Question 441 Mark
Name two animal organs and two plant organs.
Answer
There are different animal organs. Some of the names are Heart, Stomach, brain and lungs. Stem, Leaf, Roots etc. are plant organs.
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Question 451 Mark
What are the basic parts of all the cells?
Answer
The basic parts of all the cells are- cell membrane, cytoplasm and nucleus.
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Question 461 Mark
Why are mitochondria known as power house of the cell?
Answer
Mitochondria are known as power house of the cell because it provides energy from food as a result of cellular respiration.
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Question 471 Mark
Name one ‘single cell’ which behaves like a complete organism.
Answer
Amoeba is a single cell which behaves like a complete organism.
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Question 481 Mark
What controls the flow of substance in and out of a cell?
Answer
Plasma membrane controls the flow of substance in and out of a cell.
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Question 491 Mark
A group of cells performing similar functions are known by a speciic term. What is it?
Answer
Group of cells of the same type that perform speciic function in the organism are known as tissue.
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Question 501 Mark
Mention the size of an ostrich egg. Is it a single cell of a group of cells?
Answer
An ostrich’s egg is $15$ centimetres in length and $13$ centimetres wide. The weight of this egg is about $1.5kg$ and it is single cell which is believed to be the largest existing single cell today.
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questions in on sentence. [1 M] - Science STD 8 Questions - Vidyadip