Science Secondary 1A Subject Area: Science (+KEY)

Unit 1: Basic Units of Life

Mark ✗ for the correct answers.

1 What are the tiny units that make up living organisms?

a. Chloroplasts
b. Tissues
c. Cells
d. Organs

2 What is a cell covered by?

a. Cell membrane
b. Vacuole
c. Cytoplasm
d. Nucleus

3 Which is the control center of the cell?

a. Nucleus
b. Vacuole
c. Golgi body
d. Endoplasmic reticulum

4. What is the component which carries out a specific function within a cell?

a. Organelle 
b. Tissue
c. Body 
d. System

5 What cannot take place in the absence of a nucleus?

a. Cell movement 
b. Cellular respiration
c. Cell rigidity 
d. Cell division

6 Which tool is used to facilitate the study of cells?

a. Spectroscope
b. Microscope
c. Magnifier
d. Telescope

7 Which series of biological levels is correctly arranged from the smallest to the largest?

a. Cells → Tissues → Organs → Organ systems → Body
b. Cells → Organs → Tissues → Organ systems → Body
c. Organ systems → Body → Cells → Organs → Tissues
d. Tissues → Cells → Body → Organs → Organ systems

8 What structures are found only in plant cells?

a. Vacuole and Golgi body
b. Cell membrane and cell wall
c. Nucleus and mitochondria
d. Cell wall and chloroplast

9 What are the green pigments that function in photosynthesis and where are they found?

a. Lycopenes found in chloroplasts
b. Chlorophylls found in chloroplasts
c. Lycopenes found in Golgi bodies
d. Chlorophylls found in Golgi bodies

10 What cell has an indented center like a doughnut?

a. White blood cell
b. Nerve cell
c. Red blood cell
d. Root cell

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Key

1 Ans: c.

Cells are the tiny units that make up the living organisms.

2 Ans: a.

A cell is covered by a cell membrane.

3 Ans: a.

The nucleus is the control center of a cell. It controls the working of all the other organelles such as the vacuole, Golgi bodies, and ndoplasmic reticulum.

4 Ans: a.

An organelle carries out a specific function within a cell.

5 Ans: d.

Cell division requires the participation of the chromosomes and other structures in the nucleus.

6 Ans: b.

A microscope is used to enlarge and study cells.

7 Ans: a.

Cells are the smallest biological level.

Many similar cells form a tissue.

Different tissues form an organ. Different organs form a system. All the systems form the body.

8 Ans: d.

The cell wall and the chloroplasts are found only in plant cells. 

They are absent in animal cells.

9 Ans: b.

The green pigments are the chlorophylls which are located on the membranes of chloroplasts.

10 Ans: c.

A red blood cell has an indented center or a biconcave disk shape to increase its surface area for the diffusion of oxygen.