Tag: biology

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Questions Related to biology

Multiple choice biology selection and evolution ethology animal behaviour natural selection

Initial causes of ecological succession, responsible for destruction of existed

  1. Animal species

  2. Ecosystem

  3. Populations

  4. Plant species
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ecological succession is often initiated by disturbances that destroy existing populations or communities, allowing new species to colonize the area.

Multiple choice biology selection and evolution ethology animal behaviour natural selection

Which of the following codon does not justify degeneracy rule?

  1. UGG

  2. CUG

  3. GGG

  4. GAG.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Degeneracy is the rule in of genetic code which states that one amino acid can be produced by one or more codon. The example is UUU and UUG both code for same amino acid i.e phenylalanine.Tryptophan is only produced by UGG.
So the correct option is 'UGG'.
Multiple choice biology selection and evolution ethology animal behaviour natural selection

Choose the correct answers from the alternatives given.
Natural selection may occur when there are

  1. heritable traits

  2. differences in the adaptiveness of forms of traits to prevailing environmental conditions

  3. differences in survival and reproduction among individuals that differ in one or more traits

  4. all of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Natural selection is the process where organism with favorable traits are more likely to reproduce. In doing so, they pass on these traits to the next generation. Over time this process allows organism to adapt to their environment.

Hence, the correct answer is 'all of the above'

Multiple choice biology animal behaviour ethology natural selection coordination in human beings- chemical control endocrine system in humans

On seeing a snake, the prey becomes motionless because

  1. It is hypnotized.

  2. It is anaesthetized.

  3. Instinct to avoid being noticed.

  4. Both A and B.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

For the purpose of avoiding being noticed and to save itself successfully from the snake, the prey becomes motionless. It ambushes itself well with the surroundings. The ambush may be set by hiding in a burrow, by camouflage, by aggressive mimicry, or by the use of a trap.

So, the correct option is 'Instinct to avoid being noticed'.

Multiple choice biology animal behaviour ethology natural selection coordination in human beings- chemical control endocrine system in humans

Fish do not need to learn how to swim is an example of ________ behavior.

  1. Instinct

  2. Imprinting

  3. Imitation

  4. Both A and B
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Instinct behaviors are innate abilities. They occur and are present from birth onward and are not learned behaviors. It is performed by all members of their species. They are typically a fixed action pattern (FAP) that occurs as a result of a specific stimulus. For example, spinning a web by a spider, nest building and other maternal activities, migration patterns of animals, social behavior in pack animals, swimming by fish, etc.
  • Hence, fish do not need to learn how to swim is an example of instinct behavior.
Multiple choice biology animal behaviour ethology natural selection coordination in human beings- chemical control endocrine system in humans

A frog has its brain crushed, but when pinched on the leg, the leg draws away. It is an example  of 

  1. neurotransmitter induced response

  2. simple reflex

  3. condition reflex

  4. automated motor response.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The action does not involve the brain and is an example of a simple reflex. When the leg of the frog is pinched, the stimulus is received by receptors on the skin that set up a sensory impulse. This impulse is carried to the spinal cord through the dorsal sensory root of a spinal nerve. The spinal cord then transforms the sensory impulse into a motor impulse. This impulse is then transmitted to the leg muscles. The muscles on receiving the impulse contract and the leg is withdrawn to avoid the stimulus. So, the correct option is 'simple reflex'.

Multiple choice biology animal behaviour ethology natural selection coordination in human beings- chemical control endocrine system in humans

Which of the following is incorrect w.r.t scientific names of the given animal?

  1. Brain coral - meandrine

  2. portuguese man of war - physalia

  3. Venus flower basket - Euplectella

  4. bath sponge - spongilla
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Brain coral is typically of the genus Diploria or similar; 'meandrine' is a descriptive term for its shape, not a scientific genus name. The other options correctly match the common names to their respective genera.