Science Question Answer (1 Marks)

Microscope was essential for the study of cells.

Gene is a unit of inheritance in living organisms.

The basic similarity among all the living organisms is that they all are made up of cells.

The spindle-shaped cells present in the human body are muscle cells.

Plant cells differ from animal cells in having an additional layer around the cell membrane termed cell wall.

Muscle cells in the human body can contract and relax.

Robert Hooke in 1665 observed a thin slice of cork through a microscope and coined the term ‘cell’

Cell wall protects outside to the plant cell.

Mitochondria releases energy from food in the plant cell.

Bacteria mycoplasma is the smallest cell measuring 0.1 micrometer.

Plasma membrane is the outermost layer of an animal cell.

A muscle cell is pointed at both ends and has a spindle shape.

Amoeba has no definite shape, and it keeps on changing its shape.

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.

Nerve cell transmit message between the brain and other parts of the body.

Animal cells do not have a cell wall around them.

Cell is structural and functional unit of all living beings.

Chloroplast is the organelle of a plant cell where photosynthesis takes place.

False.
Explanation:
All the cells in our body exhibit variety of shapes and sizes so that they can perform different functions.

Mitochondria and Endoplasmic reticulum.

Nerve cell is a long and has thread like branches.

Coloured plastid (Chromoplasts) gives the red colour in tomatoes.

Red blood cell is spherical in shape.

Cell wall.

Nucleus controls all the activities of the cell.

They possess photosynthetic pigment called chlorophyll.

The parts which are present only in plant cells are- Cell wall, chloroplasts and large vacuole.

Mitochondria is the site of respiration.

White blood cells present in human blood is a single cell (other than Ameoba cell) which can change its shape.

Chloroplasts help in the synthesis of food by the process of photosynthesis.

Cell organelles are present in the cytoplasm.

Prokaryotic cell does not have a true nucleus.

A plant cell has a large vacuole.

Nucleus is the largest floating body generally in the center of a cell.

Plant cells are surrounded by a cell wall.

There are different animal organs. Some of the names are Heart, Stomach, brain and lungs. Stem, Leaf, Roots etc. are plant organs.

The basic parts of all the cells are- cell membrane, cytoplasm and nucleus.

Amoeba is a single cell which behaves like a complete organism.

Plasma membrane controls the flow of substance in and out of a cell.

Leaves are responsible for synthesis of food.

Cell wall and plastids are present only in a plant cell.

Plant roots help in the absorption water and minerals.

Cell is the smallest unit of life.

The largest cell measuring 170mm ×130mm, is the egg of an ostrich.

Nucleus controls all activities of the cell; hence it is also called Master or Director of the cell.