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🧬 Biology, NCEA

Years 11 to 13 · Read up first

10 questions. Get 8 right to earn 10 minutes. All 10 right = +5 bonus. They start easy and get harder as you go, so treat the first few as a warm-up. Every one you miss comes back with the answer and why.

1. An ecosystem is best described as

a zoo or nature reserveonly the non-living parts of an environmenta single species living alonea community of living things interacting with each other and their physical environment

2. Which organelle is known as the powerhouse of the cell, producing most of its ATP?

Golgi apparatusRibosomeNucleusMitochondria

3. The overall word equation for photosynthesis is

oxygen + water produce glucosecarbon dioxide + water, using light energy, produce glucose + oxygenglucose + oxygen produce carbon dioxide + water, releasing energyglucose produces alcohol + carbon dioxide

4. A species' 'niche' refers to

the exact geographic location it lives inthe number of individuals in a populationits position in a food chain onlythe role it plays and resources it uses within its habitat

5. Mitosis produces

two cells with double the chromosome numberfour genetically different haploid cellstwo genetically identical diploid cellsone large cell

6. DNA replication is described as 'semi-conservative' because each new DNA molecule contains

two original strandshalf of one gene and half of anotherone original (old) strand and one newly made strandtwo completely new strands

7. Which process is responsible for producing sperm and egg cells in humans?

MeiosisTranscriptionMitosisBinary fission

8. Primary succession begins on

farmland taken out of usea forest after a small firean existing field cleared of vegetationbare rock or newly formed land with no soil, such as after a volcanic eruption

9. A student adds the same amount of enzyme to test tubes with increasing substrate concentration. The rate of reaction increases at first but eventually levels off. What explains the levelling off?

The temperature has changedThe substrate has run out completelyThe enzyme's active sites are all occupied at once (saturation)The enzyme has been used up

10. A plant is kept in complete darkness for several days. What would you expect for the net exchange of gases through its leaves, and why?

The plant would stop respiring entirelyThe plant would release oxygen and take in carbon dioxide, as normalThe plant would take in oxygen and release carbon dioxide, since only respiration occurs without light to drive photosynthesisGas exchange would stop completely since no photosynthesis occurs

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