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

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

  1. Habituation

  2. A stimulus

  3. Operant conditioning

  4. Reasoned behavior

  5. Imprinting
Reveal answer Fill a bubble to check yourself
E Correct answer
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.

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

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 

  1. Aposematic coloration

  2. Batesian mimicry

  3. Cryptic coloration

  4. Chemical defense

  5. Herbivory
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.
Multiple choice biology animal behaviour ethology natural selection coordination in human beings- chemical control endocrine system in humans

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

  1. Circinal rhythm

  2. Circadian rhythm

  3. Tidal rhythm

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Which of the following sets is of flightless birds

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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

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

Which of them is in tracheae group

  1. Crab-Centipede-Cockroach

  2. King crab-Scorpion-Housefly

  3. Spider-Peripatus-Mosquito

  4. Bedbug-Sandfly-Silkworm
Reveal answer Fill a bubble to check yourself
D Correct answer
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 .

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

The immunoglobulin abundant in colostrum is

  1. Ig G

  2. Ig M

  3. Ig A

  4. All of the above

  5. Ig E
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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

  1. Chyme

  2. Chyle

  3. Cholesterol

  4. Colostrum
Reveal answer Fill a bubble to check yourself
D Correct answer
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'

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

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?

  1. d

  2. a

  3. b

  4. c
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.