Which chromosome determines the male sex in humans?
(A) X-chromosome
(B) Y-chromosome
(C) W-chromosome
(D) Z-chromosome
Each person normally has one pair of sex chromosomes in each cell. The Y chromosome is present in males, who have one X and one Y chromosome, while females have two X chromosomes. Identifying genes on each chromosome is an active area of genetic research.
The stink bug is an insect of-
(A) Cotton
(B) Paddy
(C) Tobacco
(D) Brinjal
Body organization is found in hydra-
(A) Tissue category
(B) Organ range
(C) Cellular series
(D) Acellular category
Which one of the following is the correct taxonomic hierarchy?
(A) Jagat (Kingdom) – Sangha – Gana – Vansh – Kula – Varga – Jati
(B) Jagat – Gana – Varga – Sandha – Kul – Vansh – Jati
(C) Jagat – Varga – Gana – Sangha – Kul – Jati – Vansh
(D) Jagat – Sangha – Varga – Gana – Kul – Vansh – Jati
Poisonous lizard is-
(A) Draco
(B) Hemidactyls
(C) Heloderma
(D) Calotus
If a healthy fish of fresh water is kept in salt water, then that fish
(A) dies of dehydration
(B) swells up and dies
(C) dies due to microbial infection
(D) does not experience any problem
Which one of the following is most sensitive to environmental changes?
(A) Amphibians
(B) Reptile
(C) Mammal
(D) Insect
In which period did mammals emerge?
(A) Triassic
(B) Jurassic
(C) Cretaceous
(D) Permian
The number of ossicles in the ear of mammals is
(A) 2
(B) 3
(C) 4
(D) 5
The mammalian middle ear contains three ossicles, which move the vibrations of the eardrum into waves in the liquid and membrane of the inward ear. There are three ossicles in every ear : Malleus, Incus, Stapes. As we have a couple of ears, so altogether there are 6 ossicles, or 3 sets of ossicles.
What are the cold-blooded animals called?
(A) Those who do not have hemoglobin in their blood
(B) Who are not fearful
(C) Whose body temperature remains constant
(D) Whose temperature keeps changing according to the environment
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