Q 01/05

Which organelle is nicknamed the "powerhouse of the cell"?

A) Mitochondrion

B) Ribosome

C) Nucleus

D) Vacuole

Answer · why

A) Mitochondrion

The nickname was popularized by a 1957 Scientific American article; the energy-releasing reactions happen on the folded inner membrane.

Q 02/05

Along with water and light, what do plants need to make their own food through photosynthesis?

A) Nitrogen gas

B) Carbon dioxide

C) Water vapour

D) Hydrogen gas

Answer · why

B) Carbon dioxide

The gas is pulled in through tiny pores called stomata, and the oxygen we breathe is the leftover from the process.

Q 03/05

Gregor Mendel worked out the basic rules of inheritance by breeding which plant?

A) Tomatoes

B) Sunflowers

C) Peas

D) Corn

Answer · why

C) Peas

He tracked seven traits, including seed shape and flower colour, across roughly 28,000 plants in a monastery garden.

Q 04/05

What is the basic unit of heredity called?

A) Enzyme

B) Neuron

C) Protein

D) Gene

Answer · why

D) Gene

Each one is a stretch of DNA, and humans carry roughly 20,000 of them coding for proteins.

Q 05/05

Which type of blood cell carries oxygen from the lungs to the rest of the body?

A) Red cells

B) White cells

C) Platelets

D) Plasma

Answer · why

A) Red cells

The iron-rich molecule hemoglobin inside them grabs the oxygen, and it is also what makes blood look red.