GSEB Solutions for Class 7 Science and Technology – Unit of Living – Cell

GSEB Solutions for Class 7 Science and Technology –  Fertility of the Soil (English Medium)

GSEB SolutionsMathsScience
Exercise 56:

Solution 1(a):

The following picture indicates the organization of living and non-living things.
For building a house, the essential component is the brick, without which the construction is impossible. The bricks join to form a wall, a wall is partitioned to form small rooms and finally, a whole building.
Likewise, the structural and functional constituent of our body is cell. Many cells form tissues, tissues form organs, organs forms organ system that give rise to a whole body.

Exercise 57:

Solution 1(a):

Observations

1. The rectangular cells of onion epidermis are seen which is called cell wall.
2. A deeply coloured, round body is seen known as nucleus.
3. A thin layer of less deeply coloured substance along the inner surface of cell wall is seen, called cytoplasm.

Exercise 59:

Solution 1(a):

Observations

1. The cheek cell is found inside of the mouth, on the cheek.
2. It consists of a nucleus, cell membrane and cytoplasm.

Exercise 61:

Solution 1(a):

No.	Structure	Plant Cell	Animal Cell
1	Cell Wall	Present	Absent
2	Shape	Rectangular	Oval
3	Vacuole	One large vacuole	More than one vacuole
4	Chloroplast	Present	Absent
5	Lysosome	Not evident	Present in cytoplasm
6	Centrioles	Absent	Present
7	Plastids	Present in cytoplasm	Absent

Exercise 64:

Solution L.1:

Solution L.2:

Solution L.3:

The above diagram is of a unicellular animal called amoeba.

Solution 1:

Cell is the structural and functional unit of life of all living organisms which provides structure for the body and carries out specialized functions.

Solution 2:

Cells are small compartments that hold the biological equipment necessary to keep an organism alive and successful. There are smaller pieces that make up cells such as macromoleculesandorganelles. The various cell organelles are cell membrane, endoplasmic reticulum, ribosome, Golgi body, lysosome, mitochondria, centriole, chloroplast and cell wall.