Cells for Sec 1 G1 students

What are living things made of?

• Atoms

• Cells

• Molecules

• Tissues

Answer explanation

Living things are primarily made of cells, which are the basic units of life. While atoms and molecules are components of cells, it is the cells that form the structure and function of living organisms.

Which part of a typical animal cell is responsible for controlling the cell's activities?

• Cell membrane

• Cytoplasm

• Nucleus

• Mitochondria

Answer explanation

The nucleus is the control center of a cell, regulating its activities by managing gene expression and coordinating cellular functions. It contains the cell's genetic material, which directs all cellular processes.

What is the primary function of a microscope?

• To make objects look smaller

• To make objects look bigger

• To change the color of objects

• To weigh objects

Answer explanation

The primary function of a microscope is to make objects look bigger, allowing us to see details that are not visible to the naked eye. This is essential for scientific observation and analysis.

What is the primary function of the cell membrane?

• It produces energy for the cell.

• It controls substances entering or leaving the cell.

• It stores genetic information.

• It synthesizes proteins.

Answer explanation

The primary function of the cell membrane is to control substances entering or leaving the cell, maintaining homeostasis and regulating the internal environment.

Which of the following is an example of a trait that can be inherited?

• Hair color

• Favorite food

• Language spoken

• Favorite sport

Answer explanation

Hair color is a genetic trait that can be passed from parents to offspring, making it an inherited characteristic. In contrast, favorite food, language spoken, and favorite sport are influenced by personal choices and environment.

Where are genes found within a cell that control the traits of humans?

• Cytoplasm

• Nucleus

• Cell membrane

• Ribosome

Answer explanation

Genes, which control human traits, are located in the nucleus of a cell. The nucleus houses the cell's genetic material, DNA, which contains the instructions for building and maintaining the organism.

What type of cell is used to transport oxygen to all parts of the body?

• White blood cell

• Platelet

• Red blood cell

• Nerve cell

Answer explanation

Red blood cells are specialized cells that transport oxygen from the lungs to all parts of the body. They contain hemoglobin, which binds to oxygen, making them essential for oxygen delivery.

What is the role of haemoglobin in red blood cells?

• It helps in digestion

• It binds to oxygen and carries it around the body

• It fights bacteria

• It stores energy

Answer explanation

Haemoglobin is a protein in red blood cells that binds to oxygen in the lungs and carries it to tissues throughout the body, making it essential for oxygen transport.

Which structure in a plant cell is responsible for photosynthesis?

• Cell wall

• Chloroplast

• Vacuole

• Nucleus

Answer explanation

The chloroplast is the organelle in plant cells that conducts photosynthesis, converting sunlight into energy. It contains chlorophyll, which captures light energy, making it essential for this process.

Which part of a plant cell provides structural support and protection?

• Vacuole

• Nucleus

• Cell wall

• Chloroplast

Answer explanation

The cell wall is the part of a plant cell that provides structural support and protection. It surrounds the cell membrane, giving the cell its shape and helping to protect it from external stress.