Question 14 Marks
Draw the general diagram of a plant cell and label it.
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Question 24 Marks
Draw the general diagram of an animal cell and label it.
Question 34 Marks
An Ameoba cell can change its shape and a white blood cell in human blood can also changing its shapes. What is the difference between an Amoeba cell and a white blood cell?
Answer
View full question & answer→An Ameoba cell can change its shape and a white blood cell in human blood can also changing its shapes. The difference between an Amoeba cell and a white blood cell is that the Amoeba cell is a full-fledged organism which is capable of independent existence. While white blood cell is only a cell of human blood which is not a full-fledged organism and hence cannot exist independently. White blood cells can exist only inside the blood.
Question 44 Marks
Explain why, chloroplasts are found only in plant cells.
Answer
View full question & answer→Chloroplasts are the green coloured plastids present in the cytoplasm of plant cells. They possess photosynthetic pigment called chlorophyll. Chlorophyll absorbs energy from the sunlight during the process of photosynthesis. In the process of photosynthesis, green plants make their own food in the presence of sunlight and chlorophyll with the help of inorganic substances like carbon dioxide and water. Thus, chloroplast help in the synthesis of food by green plants.
Question 54 Marks
Which of the following are plant organs and which are animal organs? Brain, Leaf, Lungs, Roots, Stem, Kidneys, Flower, Heart.
Answer
View full question & answer→| Plant organs | Anlmai organs |
| Leaf | Brain |
| Roots | Lungs |
| Stem | Kidneys |
| Flower | Heart |
Question 64 Marks
The part of $P$ and $Q$ are present only in plant cells, and they are not present in animal cells. The part $P$ contains a green pigment called $R$ whereas part $Q$ is made of a tough material $S$. The part $P$ takes part in the food making process whereas part $Q$ gives shape and support to the plant cell.
$a.$ What is $(i)\ P$, and $(ii)\ Q$?
$b.$ What is $(i)\ R$, and $(ii)\ S$?
$a.$ What is $(i)\ P$, and $(ii)\ Q$?
$b.$ What is $(i)\ R$, and $(ii)\ S$?
Answer
View full question & answer→$a. (i)$ The part $P$ is Chloroplasts Chloroplasts are the food producers in plant cells and they are not present in animal cells because animal cells do not make their own food.
$(ii)$ The part $Q$ is Cell wall The cell wall is absent in the animal cells because they don't need cell walls. The main purpose of a cell wall is to provide stability and stiffness to the cell. And it is made up of cellulose.
$b. (i)$ The part $R$ is Chlorophyll Chlorophyll is the green pigment present in the leaves.
$(ii)$ The part $S$ is Cellulose Cellulose is a fiber and wood, cotton, etc. all contain cellulose.
$(ii)$ The part $Q$ is Cell wall The cell wall is absent in the animal cells because they don't need cell walls. The main purpose of a cell wall is to provide stability and stiffness to the cell. And it is made up of cellulose.
$b. (i)$ The part $R$ is Chlorophyll Chlorophyll is the green pigment present in the leaves.
$(ii)$ The part $S$ is Cellulose Cellulose is a fiber and wood, cotton, etc. all contain cellulose.
Question 74 Marks
Where are chromosomes found in a cell? State their function.
Answer
View full question & answer→Chromosomes are thread-like structures usually present in the nucleus that become visible only during cell divisions. The function of chromosomes is to transfer the characters from parents to the off springs through the genes located on them.
Question 84 Marks
Make a sketch of human nerve cell. What function do nerve cells perform?
Answer
The function of nerve cell: The nerve cell receives and transfers messages, thereby helping to control and coordinate the working of different parts of the body.
View full question & answer→The function of nerve cell: The nerve cell receives and transfers messages, thereby helping to control and coordinate the working of different parts of the body.Question 94 Marks
What are the functions of the following organs?
$a.$ Heart.
$b.$ Brain.
$c.$ Roots.
$d.$ Leaves.
$a.$ Heart.
$b.$ Brain.
$c.$ Roots.
$d.$ Leaves.
Answer
View full question & answer→$a.$ Heart $-$ It pumps blood throughout the body.
$b.$ Brain $-$ It controls the activities of other parts of the body.
$c.$ Roots $-$ These help in absorption of water and minerals.
$d.$ Leaves $-$ These are responsible for synthesis of food.
$b.$ Brain $-$ It controls the activities of other parts of the body.
$c.$ Roots $-$ These help in absorption of water and minerals.
$d.$ Leaves $-$ These are responsible for synthesis of food.
Question 104 Marks
Which of the following are prokaryotic cells and which are eukaryotic cells?Amoeba cell, Bacterium cell, Human cheek cell, Blue-green algae cell, onion peel cell.
Answer
View full question & answer→| Prokaryotic cells | Eukaryotic cells |
| Bacterium cell. | Amoeba cell. |
| Blue-green algae cell. | Human cheek cell. |
| onion peel cell. |