Which one of the following is a growth regulator produced by plants?
Naphthalene acetic acid
Zeatin
2,4-dichlorophenoxy acetic acid
Benzyl aminopurine
In which one of the following, expenditure of energy is required?
Osmosis
Diffusion
Active transport
Passive transport
Juvenile hormone in insect is released from
protocerebrum
corpora cardiaca
corpora allata
thoracic gland
C.
corpora allata
Juvenile hormones are a group of a cyclic sesquiterprenoids which tend to regulate many aspects of insect physiology, i.e., they regulate development, reproduction diapause and polyphenisms in them. They are secreted by a pair of endocrine glands behind the brain called corpora allata. These hormones are also important for the production of eggs in female insects.
The body of Rohu fish is covered by
cycloid scale, but the tail of homocercal
placoid scale, but the tail of heterocercal
cycloid scale, but the tail of heterocerca
placoid scale, but the tail is homocercal
Management of National Park is controlled by
State Government
Central Government
United Nations
Non-Government Organisations
Objects less than 0.2 m in size cannot be see an under light microscope because
the wave length of visible light is 3900- 7800 Å
only two types of lenses are used
maximum magnifying power of ocular lens is 20 X
maximum magnifying power of objective lens is 100 X