The function of pineal body is to :
lighten the skin colours
control sexual behaviour
regulates the period of puberty
all of the above
Which of the following nerve is purely motor nerve?
Abducens is an example of a pure motor nerve. It arises from the anterior end of medulla oblongata in the vertebrate brain to supply the posterior rectus muscle of each eye ball.
Which of the following part of a neuron is covered by fatty sheath ?
node of Ranvier
A fruit developed from a condensed inflorescence is :
Photosynthetic bacteria have :
pigment system I (only one pigment system)
pigment system II
both (a) and (b)
some other type
Active transport occurs :
against concentration gradient and requires ATP
against concentration gradient and does not require ATP
along concentration gradient but require ATP
along concentration gradient but does not require ATP