Which one of the following is a growth regulator produced by plants?

• Naphthalene acetic acid

• Zeatin

• 2,4-dichlorophenoxy acetic acid

• Benzyl aminopurine

12.

In apple, the edible portion is

• mesocarp

• epicarp

• endocarp

• thalamus

In which one of the following, expenditure of energy is required?

• Osmosis

• Diffusion

• Active transport

• Passive transport

The protein component of a holoenzyme is known as

• coenzyme

• cofactor

• prosthetic group

• apoenzyme

K_m is

• product

• enzyme

• constant

• unit

Juvenile hormone in insect is released from

• protocerebrum

• corpora cardiaca

• corpora allata

• thoracic gland

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

Which one is an example of living fossil?

• Coral

• Ascidia

• Octopus

• King crab

Objects less than 0.2 $\mathrm{\mu }$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