The hormone that promotes the development of male secondary sexual characteristics is:
A. Testosterone
B. Prolactin
C. Estrogen
D. Progesterone
Answer: Option A
Solution (By JKSSB Mock Tests)
Testosterone, secreted by Leydig cells of the testes, is responsible for the development of male secondary sexual characteristics like facial hair, deepening of voice, and muscle growth. Estrogen and progesterone are female hormones.
Explanation:
The correct taxonomic hierarchy in ascending order is: Species (lowest) → Genus → Family → Order → Class → Phylum (or Division in plants) → Kingdom (highest). Some classifications add Domain above Kingdom. This system groups organisms based on shared characteristics. Binomial nomenclature uses Genus and Species. Option A correctly places Family before Order.
Explanation:
Parthenocarpy is the development of fruit without fertilization, leading to seedless fruits like commercial banana, navel orange, and some grapes. It can be natural or induced by hormones. True fruits develop from ovary after fertilization.
Explanation:
Musca domestica is the common housefly, a dipteran insect. Periplaneta americana is the American cockroach, Drosophila melanogaster is the fruit fly used in genetics, Apis indica is the Indian honeybee. Housefly can act as a mechanical vector for diseases like typhoid, cholera. Scientific names help precise identification.
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