1. Which best describes a prokaryotic cell?

It has a true nucleus and membrane-bound organelles It has no true nucleus, and its DNA floats freely in the cytoplasm It contains mitochondria and chloroplasts It is always multicellular

2. Which of the following organisms is prokaryotic?

Earthworm Fungus Bacteria Plant

3. What is the main function of the nucleus in a eukaryotic cell?

It produces energy for the cell It transports water only It has no particular function It houses and protects the cell's genetic material (DNA)

4. Which organelle in eukaryotic cells is responsible for producing energy?

Cytoplasm only Nucleus Cell wall Mitochondria

5. Which organelle, found only in plant cells, helps trap sunlight to make food?

Mitochondria Chloroplast Nucleus Ribosome

6. Which process removes carbon dioxide from the atmosphere?

Respiration Decomposition Combustion Photosynthesis

7. Global warming is caused by ______.

Circulation of oxygen in the atmosphere Release of hydrogen into the atmosphere Circulation of nitrogen in the atmosphere Excessive release of carbon dioxide into the atmosphere

8. Which process releases carbon dioxide when living organisms breathe?

Respiration Photosynthesis Combustion only Decomposition only

9. Which of the following is a human activity that disrupts the carbon cycle?

Planting trees Burning of fossil fuels Recycling waste Conserving water

10. Why is carbon dioxide called a greenhouse gas?

It has no effect on temperature It cools the Earth down It traps heat in the atmosphere, like a blanket around the Earth It removes heat from the atmosphere

11. Which of these correctly shows the order of the mosquito's life cycle stages?

Larva, Egg, Pupa, Adult Pupa, Adult, Egg, Larva Adult, Pupa, Larva, Egg Egg, Larva, Pupa, Adult

12. How does the larva stage of a mosquito obtain oxygen?

It comes to the surface of the water and breathes through a structure called the siphon It absorbs oxygen through its skin underwater only It does not need oxygen at this stage It breathes through gills like a fish

13. Which sex of mosquito bites humans and transmits malaria?

Only the male mosquito Only the female mosquito Both male and female equally Neither male nor female

14. What does a female Anopheles mosquito transmit that causes malaria?

Bacteria A virus Plasmodium (a parasite) A fungus

15. Which method is considered the best way to control mosquito breeding?

Clearing stagnant water so mosquitoes cannot lay eggs Spraying insecticide only Applying repellent cream only Using mosquito coils only

16. What is a raised bed?

A mound of soil piled up above the normal ground level to improve drainage A bed dug below ground level A bed level with the surrounding ground A bed made entirely of sand

17. What is a sunken bed?

A mound piled above ground level A bed dug slightly below ground level to trap and hold water A bed with no soil at all A bed used only for flowers

18. Which of these crops is well suited to being grown on a raised bed?

Only cactus Only mushrooms Tomatoes No crops can grow on raised beds

19. Why are raised beds especially useful during the rainy season?

They trap extra water for the plant They prevent sunlight from reaching the plant They have no effect on water at all They improve water drainage, preventing roots from becoming waterlogged

20. Which of these is a way to track a crop's growth over time?

Measuring height, observing stem/leaf size, and recording the days until flowering Only checking the colour of the soil Only counting the number of farmers nearby Ignoring the plant completely