Tag: endocrine system in humans

Questions Related to endocrine system in humans

Which of the following explains the return of salmon to their own birth place to breed?

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

  1. Habituation

  2. A stimulus

  3. Operant conditioning

  4. Reasoned behavior

  5. Imprinting

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Correct Option: E
Explanation:

A form of learning that occurs during a brief genetically determined critical period shortly after birth is called as imprinting. Salmon learned, shortly after birth, about their birth place as they found themselves there just after birth. This makes them recognize the place and go there for breeding. Conditioned is also a learned response in which stimulus becomes associated with a consequence. Habituation is the most complicated form of learned behavior and includes applying something already learned to a new situation without a period of trial and error. The reasoning is making the concept of cause and effect in particular context. Thus, the correct answer is option E.

Organisms within a community have developed defenses against predators. Identify the type of defense described in the following 4 questions using the answers provided. Answer choices may be used once, more than once or not at all.
Skunks spray a toxic substance when they are threatened. This is an example of 

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

  1. Aposematic coloration

  2. Batesian mimicry

  3. Cryptic coloration

  4. Chemical defense

  5. Herbivory

Show answer
Correct Option: D
Explanation:
A. Aposematic colouration is a type of defense mechanism, also known as warning coloration in which the color or pattern of a predator is perceived by an organism that the predator is harmful for him.
B. Batesian mimicry is a type of defense mechanism in which on organism protects itself from a predator by mimicking a organism that is otherwise safe from the predator.
C. Cryptic coloration is a type of defense mechanism in which an organism camouflage by blending its color with the background color of its environment to protect itself from the predator.
D. Chemical defense is a type of defense mechanism in which toxic chemicals are produced by the organism to protect itself from the predator.
E. Herbivory is the eating of plants by animals (herbivores).
Hence the statement given in the question that Skunks spray a toxic substance when they are threatened, is an example of Chemical defense.
So, the correct answer is 'Chemical defense'.

Sinking of zooplankton during the day and rising to the
surface at night is an example of

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

  1. Circinal rhythm

  2. Circadian rhythm

  3. Tidal rhythm

  4. None of these

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Correct Option: B
Explanation:

Circadian rhythm or diurnal rhythm is any 24 hour  periodicity in the behaviour or physiology of animals or  plants .Examples are sleep /activity cycle in many  animals and the growth movements of plants. Circadian  rhythms are generally controlled by biological clocks.

Which of the following sets is of flightless birds

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

  1. Penguin, Pecock, Fowl, Rhea, Kiwi, Moa, Ostrich

  2. Emu, Penguin, Rhea, Kiwi, Moa, Cassowary

  3. Albatros, Humming bird, Falcon, Hawk, Emu

  4. Ostrich, Emu, Kiwi, Falcon, Albatros

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Correct Option: B
Explanation:

All flightless  birds belong to the super -order Ratitae e.g. Emu, Panguin, Rhea, win, Moa, Cassowary .

Sea cows are aquatic mammals included under

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

  1. Lagomorpha

  2. Pinnipedia

  3. Cetacea

  4. Sirenia

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Correct Option: D
Explanation:

Sea cows (Rhytina) belong to order Sirenia of mammals. Presence of blubber and few hairs are characters of order sirenia. 

Which of them is in tracheae group

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

  1. Crab-Centipede-Cockroach

  2. King crab-Scorpion-Housefly

  3. Spider-Peripatus-Mosquito

  4. Bedbug-Sandfly-Silkworm

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Correct Option: D
Explanation:

Bed bug ,sand fly silk worn are placed in tracheate  group of Arthropoda because they have trachae for  respiration Embryonic development of echinoderms shows a number of similarities with those of chordates .

The immunoglobulin abundant in colostrum is

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

  1. Ig G

  2. Ig M

  3. Ig A

  4. All of the above

  5. Ig E

Show answer
Correct Option: C
Explanation:

The yellow-coloured milk secreted by cattle soon after the birth of a calf is called as colustrum. Colostrum contains antibodies to protect the newborn against disease. Colostrum is known to contain immune cells (as lymphocytes) and many antibodies such as IgA, IgG and IgM. However, the most abundant immunoglobulin in colostrum is IgA.

The yellow-coloured milk secreted by cattle soon after the birth of a calf is called as 

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

  1. Chyme

  2. Chyle

  3. Cholesterol

  4. Colostrum

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Correct Option: D
Explanation:

The yellow-coloured milk secreted by cattle soon after the birth of a calf is called as colostrum. It is rich in antibodies that confer passive immunity to the newborn

So, the correct answer is 'Colostrum'

Cows and buffaloes remain in heat for :

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

  1. 24-36 hours

  2. 24-26 days

  3. 7-10 days

  4. 15-20 days

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Correct Option: A

The table below gives the populations (in thousands) of ten species (A-J) in four areas (a-d) consisting of the number of habitats given within brackets against each. Study the table and answer the question which follows :-










































































































































Area and Number of habitats Species and their populations (in thousands) in the areas
A B
a (11) 2.3
b (11) 10.2
c (13) 11.3
d (14) 3.2





Which area out of a tod shows maximum species diversity?

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

  1. d

  2. a

  3. b

  4. c

Show answer
Correct Option: A
Explanation:

Species diversity is the number of different species that are represented in a given community. The two main factors taken into account when measuring diversity are richness and evenness. The habitats c and d have a higher species richness as compared to habitat a and b as both of them have 10 different types of species, while a and b have 8 and 7 different types of species respectively. However, habitat d has more species evenness as compared to habitat c. Since, the species diversity depends both on the species richness and the species evenness, so species d has a higher species diversity as compared to species c. So, the correct option is 'd'.