1.Which one of the following statements is incorrect?
A.Viviparity is the reproductive pattern shown by most mammals
B.Viviparity occurs primarily in salamanders and caecilians.
C.In viviparity, a shell does not form around the egg.
D.Viviparity is not found in species of lizards and snakes.
Which one of the following statements is stated incorrectly regarding cartilaginous fishes?
ACartilaginous fishes have sense organs.
BMost cartilaginous fishes have color vision.
CTeeth-like placoid scales are found on the skin of cartilaginous fishes.
D In cartilaginous fishes, gas exchange occurs in the gills.
Which statement is correct regarding reptiles, birds, and mammals?
AEvolved from a common ancestor
BEmbryos are surrounded by a fluid-filled sac called amnion
COuter covering is largely watertight.
DAll of the above
Which one of the following characteristics is NOT a shared by birds and mammals?
A backbone and internal skeleton
BBreathing using lungs
DWarm blooded nature
Which one of the following statements is incorrect?
ARadial symmetry is displayed by sea anemone and aquatic animal.
BFasciola hepatica is also known as the sheep liver fluke.
CTriploblastic animals are usually bilaterally symmetrical
DMesoglea is present in between ectoderm and endoderm in Obelia
Which one of the followings belongs to platyhelminthes?
Radial symmetry is generally exhibited by which animals?
Which are attached with substratum
Which are aquatic
Which have ciliary feeding
Which have one opening of alimentary canal
Tachyglossus is a connecting link between
Reptiles and Birds
Amphibians and Reptiles
Birds and Mammals
Reptiles and Mammals
The scientific name of Asian tiger mosquito
Water-Vascular’ system is found in
Cell tissue grade of organization occurs in
Swarming generally occurs in
Animals having a built in thermostat to maintain constant body temperature are known as
Which one of the followings in birds indicates their reptilian ancestry?
Eggs with a calcareous shell
Scales on their hind limbs
Two special chambers crop and gizzard in their digestive tract
______ are devoid of respiratory, excretory and circulatory organs.
Cell division can not be stopped in which phase of the cell cycle?
What type of plant is formed when colchicine is used in the process of development of Raphanobrassica?
The non-sister chromatids twist around and exchange segments with each other during
Synapsis occurs between
mRNA and ribosomes
A male and a female gamete
Two homologous chromosomes
Spindle fibres and centromere
If you are provided with root-tips of onion in your class and are asked to count the chromosomes which of the following stages can you most conveniently look into:
Cells in G0 phase of cell cycle
Exit cell cycle
Enter cell cycle
Suspend cell cycle
Terminate cell cycle
In the somatic cell cycle:
In G1 phase DNA content is double the amount of DNA present in the original cell
A short interphase is followed by a long mitotic phase
DNA replication takes place in S-phase
G2 phase follows mitotic phase
Which of the following events takes place during Diplotene stage of prophase I of meiosis?
Compaction of chromosomes
Formation of synaptonemal complexes
Formation of recombinational nodules
Dissolution of synaptonemal complex
The major event that occurs during the anaphase of mitosis, which brings about the equal distribution of chromosomes, is
splitting of the centromeres
splitting of the chromatids
replication of the genetic material
condensation of the chromatin
Which of the following is unique to mitosis and not a part of meiosis?
Homologous chromosomes pair and form bivalents
Chromatids are separated during anaphase
Homologous chromosomes behave independently
Homologous chromosomes crossover
Arrange the following events of meiosis in the correct sequence:
II. Crossing over
IV. Disjunction of genomes
The correct sequences :
II, I, IV, III
III, II, I, IV
IV, III, II, I
I, IV, III, II
Assertion: Phase of cell division is also known as formative phase.
Reason: In formative phase new cells are produced from pre-existing cells through meiosis division.
Both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
Both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
Assertion is true, but Reason is false.
Both Assertion and Reason are false.
From the following, identify the two correct statements with reference to meiosis
I. Bead like structure are absent on chromosomes.
II. Displacement of chiasmata occurs in diakinesis.
III. Separation of two basic sets of chromosomes.
IV. No division of centromere.
The correct statements are:
Given below is the representation of a certain event at a particular stage of a type of cell division. Which is this stage?
Prophase I during meiosis
Both prophase and metaphase of mitosis
Prophase of Mitosis
Prophase II during meiosis
Study the following lists and select the correct match from the option given below.
(A) Initiation of spindle fibres (I) Anaphase - I
(B) Synthesis of RNA and Protein (II) Zygotene
(C) Action of endonuclease (III) G1 phase
(D) Movement of chromatids towards opposite poles (IV) Pachytene
(V) Anaphase - II
A - I, B - III, C - V, D - IV
A - III, B - II, C - I, D - V
A - II, B - III, C - IV, D - V
A - V, B - III, C - I, D - II