Tag: natural selection

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Questions Related to natural selection

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

Breast milk at room temperature can be stored for

  1. 4 hrs

  2. 8 hrs

  3. 12 hrs

  4. 24 hrs
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Colostrum is a milky fluid that comes from the breasts of humans, cows, and other mammals the first few days after giving birth, before true milk appears. It contains proteins, carbohydrates, fats, vitamins, minerals and proteins (antibodies) that fight disease-causing agents such as bacteria and viruses. Antibody levels in colostrums can be 100 times higher than levels in regular cow’s milk.

 Secretin is a peptide hormone that regulates water homeostasis throughout the body, and influences the environment of the duodenum. 
Rennin is also called as chymosin, protein-digesting enzyme that curdles milk by transforming caseinogen into insoluble casein. 
Serotonin or 5-hydroxytryptamine is a monoamine neurotransmitter. 
Therefore, the correct answer is option B.

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

A lizard-like member of Reptilia is sitting on a tree with its tail coiled around a twig. This animal could be 

  1. Hemidactylus showing sexual dimorphism

  2. Varanus showing mimicry

  3. Garden lizard (Calotes) showing camouflage

  4. Chameleon showing protective colouration
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Chameleons camouflage themselves in a variety of different ways but most famously by changing the colour and pattern of their skin. Most chameleons can change colour and they do this by expanding or contracting cells in their skin that contain different pigments. They can blend into their surroundings by altering the colour of their skin to match the background. Chamaeleon (girgit) shows protective colouration with its surrounding e.g., twig. 

Therefore, the correct answer is option D.

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

Which of the following explains correctly that salmon return to their specific home stream to spawn?

  1. Pheromones

  2. A Reflex

  3. Imprinting

  4. Classical conditioning

  5. Circadian rhythms
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Imprinting is defined as a learning process in which an offspring establishes species specific behaviour patterns along with recognition and attraction towards individuals of own species and even certain specific individuals (like parents). This process is classified as phase sensitive learning independent of external behaviour or other characteristics. In case of salmons, it has been theorized by Wisby and Hasler that they imprint on the unique odour of the natal water and as adults follow the same odour cues to their birth homes for spawning. Hence the correct answer is 'Imprinting'.   

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

Which is not true of breast milk?

  1. Poor maternal diet is not the main cause of inadequacy of breast milk.

  2. Breast milk takes more time to come in if prelactal feeds are given to the baby.

  3. Expressed breast milk cannot be stored at room temperature for more than 2 hrs.

  4. For a low body weight baby, ideal milk is the mother's milk. 
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Colostrum (also called as first milk) is the thin yellowish fluid secreted by the mammary glands at the time of parturition and which precedes the production of true milk. It provides a nursing infant with essential nutrients and infection-fighting antibodies (called as immunoglobulin) to protect the newborn against disease. IgA is the major immunoglobulin in colostrum. It protects from inhaled and ingested pathogens.

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

Which of the following does not show mating behaviour?

  1. Aggressive behavior

  2. Releaser pheromones

  3. Search image

  4. Territoriality

  5. Visual communication
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  1. During mating, a male generally shows agressive behaviour as a form of superiority over other fellow males.
    2. Pheromones are used as a form of communication between two mating species.
    3. A male generally marks it's territory inorder to avoid anymore competition for mating.
    4. Visual communication is primarly used to locate and identify the mating partner.
    So, the correct option is 'Search image'.
Multiple choice biology animal behaviour ethology natural selection coordination in human beings- chemical control endocrine system in humans

Mimicry always involves a model and a mimic as well as a dupe or signal receiver (the organism the mimic is trying to fool). An example of Batesian mimicry is

  1. A walking stick (a herbivore) sitting on a branch of a tree

  2. A rat snake (nonpoisonous) that looks like a poisonous species

  3. An oppossum playing possum

  4. A spider that looks like an ant

  5. A flounder that blends in with the bottom to avoid being eaten
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Batesian mimicry refers to the resemblance of a harmless or palatable species with that of a dangerous or unpalatable one to make predators avoid them. It is opposite to Mullerian mimicry wherein  dangerous, unpalatable, or poisonous species resemble one another to make predator recognize them easily. Rat snake is the nonpoisonous snake that vibrates their tails to trick predator as if they are the poisonous rattlesnake, exhibiting Batesian mimicry. None of the given options exhibit the defensive patterns of Batesian mimicry. Thus, the correct answer is option B.
Multiple choice biology animal behaviour ethology natural selection coordination in human beings- chemical control endocrine system in humans

Fish are given food at the same time as a tap on their glass bowl and soon learn to approach when a tap sounds even in the absence of food.

  1. Reasoning/insight

  2. Imprinting

  3. Classical conditioning

  4. Habituation

  5. Instinct
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Fish are given food at the same time as a tap on their glass bowl and soon learn to approach when a tap sounds even in the absence of food - it is an example of Classical conditioning.

Classical conditioning is a type of learning behaviour in which a potential stimulus is responsible for eliciting a response and is repeated many times. 

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

Which of the following behaviour takes place in an animals life at a certain critical time?

  1. Dominance

  2. Reflex

  3. Instinct

  4. Imprinting

  5. Habituation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A form of learning that occurs during a brief genetically determined critical period shortly after birth is called as imprinting. Habituation occurs throughout the life where individual learn to ignore the irrelevant stimuli. Reflex is a response to external or internal stimuli experienced throughout the life. Instinct and dominance are innate behaviours. The correct answer is D.

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

When the sperms of Funaria and Pteris are put together
near the archegonia of Pteris, only the sperms of Pteris
readily enter the archegonia and reach the egg. The reason
being that

  1. Sperms of Funaria are killed when mixed with sperms

    of Pteris

  2. Archegonia of Pteris secrete a substance with repels

    sperms of Funaria

  3. Archegonia of Pteris secrete a chemical substance which

    attracts sperms of Pteris thermostatically

  4. Sperms of Funaria are less motile
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Because archegonia of pteris secrete a chemical malic acid which attracts only sperms of Pter!s thermostatically.