Biology
Grade-8
Easy
Question
Which theory is also known as self-assembly theory?
- Theory of special creation
- Theory of chemical evolution
- Theory of spontaneous creation
- Theory of panspermia
Hint:
Theory of chemical evolution is known as self assemble theory
The correct answer is: Theory of chemical evolution
- The modern theory of chemical evolution is known as self assemble theory
- According to this theory, on primitive earth a mixture of simple chemicals assembled into more complex molecular systems
- From these molecular systems , eventually the first cell originated
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The primitive broth was free of ____________.
- Oxygen
- Sulfur
- Hydrogen
- Nitrogen
The primitive broth was free of ____________.
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- Oxygen
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The big bang theory states that the universe originated about ________ years ago.
- 50 billion
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- 20 million
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The big bang theory states that the universe originated about ________ years ago.
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- 50 billion
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Which of the following theories suggests that life originated on earth by combinations of various chemicals through constant chemical reactions over a long period?
- Theory of special creation
- Theory of chemical evolution
- Theory of spontaneous creation
- Theory of panspermia
Which of the following theories suggests that life originated on earth by combinations of various chemicals through constant chemical reactions over a long period?
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Theory of spontaneous generation was disproved by _____________.
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The theory of chemical evolution was given by _________.
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The first cell was ______________ in nature.
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Evolution is a ___________ process.
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Which theory states that life was created by god?
- Theory of special creation
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- Theory of panspermia
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A rotating cloud of hot gases and cosmic dust is called ____________.
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A rotating cloud of hot gases and cosmic dust is called ____________.
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Theory of biogenesis was given by__________.
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__________ is defined as change over time.
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Which of the following is FALSE?
- A kangaroo rat does not drink water.
- Penguins travel in groups to share body heat.
- Camels have a layer of blubber under their skin to protect themselves from heat.
- The skunk sprays disgusting chemicals to ward off predators.
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- Penguins travel in groups to share body heat.
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Which of the following is an example of behavioural adaptation:
- A turtle hiding inside its shell on the arrival of its predator
- A chameleon sitting on a branch and changing its color
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- A turtle hiding inside its shell on the arrival of its predator
- A chameleon sitting on a branch and changing its color
- A butterfly mimicking another poisonous butterfly species to deter predators
- The spines of a porcupine
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Which of the following is a structural adaptation:
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- A hognose snake that rolls over slows down its breathing and hangs its tongue out to play dead to its predators.
- A herd of buffalo encircling their younger ones to protect them from a pack of wolves.
- A dung beetle rolling a piece of dung across the desert.
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- The bright-colored wings of a butterfly warn predators that it is poisonous.
- A hognose snake that rolls over slows down its breathing and hangs its tongue out to play dead to its predators.
- A herd of buffalo encircling their younger ones to protect them from a pack of wolves.
- A dung beetle rolling a piece of dung across the desert.