½
¼
1
¾
Correct answer is A
No explanation has been provided for this answer.
The mutation theory of organic evolution was propounded by
Gregor Mendel
Hugo de Vries
Jean Lamarck
Charles Darwin
Correct answer is B
Gregor Mendel, through his work on pea plants, discovered the fundamental laws of inheritance.
Hugo de Vries (1901) put forward a theory of evolution, called mutation theory.
Jean Baptiste Lamarck believed that traits changed or acquired over an individual's lifetime could be passed down to its offspring.
The Theory of Evolution by natural selection was first formulated in Charles Darwin's book "On the Origin of Species" published in 1859.
The movement of part of a plant in response to external stimulus of no particular direction is
taxism
tropism
haptotropic movement
nastic movement
Correct answer is D
Taxism: oriented movement of a motile organism in response to an external stimulus, as toward or away from light.
A tropism is a biological phenomenon, indicating growth or turning movement of a biological organism, usually a plant, in response to an environmental stimulus.
In tropisms, this response is dependent on the direction of the stimulus.
The movement or directional growth of plants or plant organs (as the tendrils of climbing plants) in response to the stimulus of touch.
The non-directional movement (of plants) in response to a stimulus (e.g. humidity, temperature, light irradiance, nutrients, gravity, etc.
The most abundant group of organisms in the animal kingdom is
Mammalia
Aves
Insecta
Annelida
Correct answer is C
The phylum Arthropoda is the largest in the animal kingdom, having its class Insecta as 70% of all known species of animals.
Which of the following is true in blood transfusion?
A person of blood group AB can donate blood only to another person of blood group AB
Persons of blood groups A and B can donate or receive blood from each other
A person of blood group AB can receive blood only from persons of blood group A or B
A person of blood group O can donate only to a person of blood group O
Correct answer is A
People with type AB+ blood are universal recipients because they have no antibodies to A, B or Rh in their blood and can receive red blood cells from a donor of any blood type.
Donors with blood type AB can donate to recipients with blood type AB only.