Species Diversity

Which of the following IUCN category is assigned when a species faces an extremely high or very high risk of extinction in the wild in immediate or near future?

Given below are two statements, one is labelled as Assertion (A) and the other is labelled as Reason (R):
Assertion (A): Four distinctive characteristics of phylum Chordata are notochord; single, dorsal, tubular nerve cord; pharyngeal pouches and postanal tail.
Reason (R) : The distinctive characteristics of phylum Chordata remain unchanged throughout the life of these animals.
In the light of the above statements, choose the most appropriate answer from the options given below

Given below are two statements, one is labelled as Assertion (A) and the other is labelled as Reason (R):
Assertion (A): Archaeopteryx lithographica demonstrates phylogenetic relatedness between birds and reptiles.
Reason (R) : Archaeopteryx lithographica was approximately the size of a crow with imprints of feathers, possessed beak-like jaws with small bony teeth set in sockets and a reptilian skeleton with a long bony tail.
In the light of the above statements, choose the most appropriate answer from the options given below

Given below are two statements, one is labelled as Assertion (A) and the other is labelled as Reason (R):
Assertion (A): Gastrulation in frog begins at a point on the embryo surface called blastopore.
Reason (R) : Hensen's node is the functional equivalent of the dorsal lip of the amphibian blastopore.
In the light of the above statements, choose the most appropriate answer from the options given below

The sequential events of fertilization in sea urchin include:
A. Contact and recognition of gamete counterparts
B. Sperm entry in polysaccharide and glycoprotein envelop around egg
C. Fusion of genetic material of two gametes
D. Activation of egg metabolism to initiate mitotic division
E. Block to the entry of additional sperm
Choose the correct answer from the options given below:

Given below are two statements:
Statement : Paedogenesis is the retention of larval characters in the adults.
Statement II: Neoteny refers to the accelerated gonadal maturation in the larvae.
In the light of the above statements, choose the correct answer from the options given below:

An anapsid skull is a characteristic of

The mimicry in which a palatable species mimics a toxic species is called

Given below are two statements:
Statement : Speciation can occur rapidly or slowly.
Statement II: Speciation can take place with geographic separation only.
In the light of the above statements, choose the most appropriate answer from the options given below

Which of the following are desired characteristics of birds?
A. Lacking urinary bladder
B. Females having one ovary
C. A few living birds have teeth
D. Colour vision
E. Endothermic
Choose the correct answer from the options given below

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Salamanders belong to order Apoda of class Amphibia.
Reason R:The order Apoda of class Amphibia includes elongated, limbless and burrowing creatures.
In the light of the above statements, choose the most appropriate answer from the options given below :

Given below are two statements:
Statement I: Sponges are the only major phylum that lack nerves.
Statement II: The simplest nervous system occurs in platyhelminthes.
In the light of the above statements, choose the correct answer from the options given below :

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: The wing of a bird, forelimb of human and forelimb of lizard are homologous.
Reason R: Organ's underlying similarity arises due to their derivation from common ancestors.
In the light of the above statements, choose the most appropriate answer from the options given below :

Carina is :

The egg of birds and fishes have only one small area which is free of yolk and where division takes place. Such an egg is known as :

All of the following are amniotes except :

The flow of water in syconoid type of water canal system in sponges follows the course of:
A. Osculum
B. Spongocoel
C. Radial canals
D. Incurrent canals
E. Dermal Ostia
Choose the correct answer from the options given below :

Match List I with List II

List I Order of class Reptilia		List II Representative animal
A.	Squamata	I.	Tortoise
B.	Crocodilia	II.	Tuatara
C.	Chelonia	III.	Gharial
D.	Rhynchocephelia	IV.	Monitor lizard

Choose the correct answer from the options given below :

Aristotle's lantern is a masticating apparatus of

In the lac operon, the lac repressor prevents the transcription initiation by binding to