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Science Test - 8
Read Instructions for the test.
Negative marks are -0.33 per wrong answer
Right answer is 1 mark
No time limit but finish in 30 mins
Solution can be found at below chapters:
Test series is based on following chapters.
Science Chapter 13: ORGANISMS AND ENVIRONMENT
Science Chapter 14: REPRODUCTION IN PLANTS
Q1: study of relationship between organisms and environment
Q2: functional unit of nature encompassing interaction between its biotic and abiotic components is
Q3: Surrounding where organisms live is called as
Q4: Majority of all species on the Earth are?
Q5: a series of organisms feeding on each other taking part at various biotic levels is called
Q6: Each step of the food chain is called as
Q7:10% law says that
10% of animals are plants
10% of the species are extinct every millenium
10% shift in habitat seen in animals
10% of the energy present is passed on to the higher trophic level
Q8:Living organisms are classified into 5 broad kingdoms which include
Q9: Since at each level organisms are eaten by several other organisms at higher level, we use ____ to depict these.
Q10:phenomenon when harmful substances absorbed by lower level are passed on to higher trophic levels is
Q11: natural aging of the river or water body due to nutrient enrichment is called
Q12: breeding crops with higher levels of vitamins and minerals is
Q13: use of microbes to make toxic waste harmless is called as
Q14: Small but rapid changes taking place in a single organism to overcome changes in the surrounding are called
Q15:When we reach high altitudes, due to low pressure body doesn’t get enough oxygen and this is countered by
increasing breathing rate
increasing RBC count in blood
reducing binding affinity of hemoglobin.
Q16: aquatic animals breathe faster than terrestrial as
oxygen dissolved in water is less
heart rate of fishes is higher
lung capaciy of fishes is smaller
Q17: Scuba divers have a lower concentration of nitrogen and higher conc. of oxygen and helium in the breathing tank as
This would create bubbles in blood vessels.
This would prevent creation of bubbles in blood vessels.
to give more energy
Q18:Small animals are rarely found in cold areas as
they might lose body heat quickly due to the larger surface area relative to the volume.
they cant tolerate cold
there are more predators
Q19:Desert plants perform photosynthesis by
both A and B
Q20: Photochemical smog is formed due to
ozone, nitric oxide, formaldehyde and sunlight.
Q21: To increase CO2 solubility in soft drinks,
Oxygen is removed from soft drink
bottle is made of glass
bottle is mixed with soda
the bottle is sealed under high pressure.
Q22: which is true
Plants obtained from vegetative propagation grow faster, bear fruits, flowers fast and are exact copies of the parent.
In asexual, new plants are obtained without seeds and in sexual they are obtained from seeds.
Q23: What fertilization mode is common in aquatic animals.
Q24: Which is true
Adolescence may begin earlier in girls.
They may grow faster than boys too.
Q25:Which is false
Oviparous animals give birth to young ones
viviparous animals lay eggs.
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