Term biology – Grade unit &2 revision

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Term 1 Grade 7 Biology Revision

BIOLOGY – Grade 7
Fill in the blanks:

  1. Epithelial tissue is classified into ______ types based on the shapes of the cells.

2. Squamous epithelium forms the outer layer of the ______.
3._______ is colourless or yellow coloured fluid without RBCs in it and
protects the body against infection.
4. Epithelial cells sometimes bear hair-like _____ on their free surface.
5. The _______ tissues are the supporting tissue in vertebrates.
6. The Fluid connective tissues are of two types ,________ and_______.
7. A collection of tissue system, performing some common functions
gives rise to an_______ .
8. The zone on the earth in which all the spheres of life exist is known
as_________ .
9. Plant tissues can be divided into two types ,_______ and __________ tissues.
Answer the following:

  1. Why a Cell is called the structural and functional unit of life?

  2. Write a short note on the cell theory. Also mention the names of the scientists who led to the formulation of cell theory.

  3. Define cell.

  4. Explain the different types of cells based on the number and give examples.

  5. Explain the different types of cells based on their shape and give examples.

  6. R obert Hooke in 1665 examined a thin slice of cork under his microscope and observed that the cork was made up of a large number of compartments as shown in the below diagram.

A. What was the shape of these compartments?
B. Were they alive?

  1. The apical meristems occur at the tip of the roots and stems. Why do you think theyare located there?

  2. In plant tissues, xylem and phloem are classified as complex tissues. Give reasons for it.

  3. Differentiate between Parenchyma and Collenchyma.

  1. T he diagram shows the image of sclerenchyma. The cells in sclerenchyma are generally called fibres. Why do you think so?

  1. Identify the type of cell and give one nature of it.

  1. Identify the unicellular organism. Give the definition of unicellular organisms.

  1. There are three types of cells present in the blood. Associate the

type of blood cell to the function performed by it.
14. The movement of locomotory organs is under our control, but not the movement of food in the alimentary canal. Give reasons.
15. Read the characteristics of the animal tissue given below and answer the questions that follow.
It is hard, porous tissue containing phosphates and carbonates of calcium and magnesium. It contains blood vessels.
A. Which animal tissue is mentioned here?
B. Write any two functions of it.
16. Differentiate between the following; (any two points)
1. Tendon and ligament
17. Write any two characteristics of connective tissues.
18. Observe the diagram of the animal tissue. Read the functions performed by it. Then answer the questions that follow.

  • Its primary function is to store energy in the form of fat.

  • It also protects internal organs by acting as a cushion.

  • It acts as heat insulator.

A. Identify the animal tissue mentioned here.
B. Write about the location of this tissue in human body based on the functions mentioned above.
19. Observe the image given below and answer the following questions:
A. Identify the type of tissue.
B. Mention the function of this type of tissue.
20. Mention the type of muscle tissue shown below and write down how this type of muscle tissue is similar to striated and unstriated muscles.


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