Tag: coordination in human beings- chemical control

Questions Related to coordination in human beings- chemical control

Continued secretion of milk is regulated by

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

  1. Prolactin

  2. Oestrogen

  3. Progesterone

  4. Aldosterone

Show answer
Correct Option: A
Explanation:

Prolactin (PRL) is a hormone that stimulates milk production. Prolactin also plays an essential role in metabolism, regulation of the immune system, and pancreatic development.

Therefore, the correct answer is option A.

To yield more milk, cow is injected with

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

  1. Sorbitol

  2. Prolactin

  3. Gonadotrophs

  4. Stilbestrol

Show answer
Correct Option: B
Explanation:

Prolactin (also called as luteotrophic) hormone is associated with lactation (secretion of milk from the mammary gland). It is a hormone released by the pituitary gland that stimulates breast development and milk production in women. Therefore, to yield more milk cow is injected with prolactin hormone. 

Sorbitol is a sweetener found in some fruits (like apple, pear etc.). 
Gonadotroph is a type of basophil in the adenohypophysis (anterior pituitary gland) whose granules secrete FSH (follicle-stimulating hormone) and LH (luteinizing hormone). 
Stilbesterol is synthetic estrogen used in hormone therapy, as a post-coital contraceptive, and as a growth-promoting agent for livestock. 
Therefore, the correct answer is option B.

Breast milk at room temperature can be stored for

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

  1. 4 hrs

  2. 8 hrs

  3. 12 hrs

  4. 24 hrs

Show answer
Correct Option: B
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.

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

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

  1. Hemidactylus showing sexual dimorphism

  2. Varanus showing mimicry

  3. Garden lizard (Calotes) showing camouflage

  4. Chameleon showing protective colouration

Show answer
Correct Option: D
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.

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

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

  1. Pheromones

  2. A Reflex

  3. Imprinting

  4. Classical conditioning

  5. Circadian rhythms

Show answer
Correct Option: C
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'.   

Which is not true of breast milk?

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

  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. 

Show answer
Correct Option: C
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.

Which of the following does not show mating behaviour?

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

  1. Aggressive behavior

  2. Releaser pheromones

  3. Search image

  4. Territoriality

  5. Visual communication

Show answer
Correct Option: C
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'.

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

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

  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

Show answer
Correct Option: B
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.

All of the following show a means of communication except

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

  1. Auditory

  2. Chemical

  3. Instinctual

  4. Tactile

  5. Visual

Show answer
Correct Option: C
Explanation:

So the correct answer is 'instinctual'.

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.

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

  1. Reasoning/insight

  2. Imprinting

  3. Classical conditioning

  4. Habituation

  5. Instinct

Show answer
Correct Option: C
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.