Biology Mcqs

The only promoter of leaf senescence in the following plant hormones is________________?

(A) Gibberellins
(B) Cytokinins
(C) Auxins
(D) Abscisic Acid

Submitted By :Ali Uppal

Abscisic acid promotes flowering in short day plants and inhibits in long day plants, which of the following is antagonistic to abscisic acid in terms of flowering______________?

(A) Gibberellins
(B) Cytokinins
(C) Auxins
(D) Ethen

Submitted By :Ali Uppal

Which of the following is antagonist to Auxin in terms of promotion of stem growth______________?

(A) Gibberellins
(B) Cytokinins
(C) Abscisic Acid
(D) none of thes

Submitted By :Ali Uppal

Gibberellins may be substituted for ___________ light, therefore promote flowering in long day plants?

(A) White
(B) Red
(C) Blue
(D) Green

Submitted By :Ali Uppal

Chemically auxins are____________?

(A) Indole propionic acid.
(B) Indole carboxylic acid.
(C) Indole acetaldehyde
(D) Indole acetic acid.

Submitted By :Ali Uppal

Cell membrane under resting conditions is impermeable to all the ions except_____________?

(A) Na+
(B) K+
(C) Cl-
(D) PO4-2

Submitted By :Ali Uppal

Maintenance of normal resting potential via movement of K+ inside the cell and na+ out is a/an ___________ process?

(A) Active
(B) Passive
(C) Diffusional
(D) None of thes

Submitted By :Ali Uppal

Type of neurons found exclusively in CNS are_____________?

(A) Sensory neurons
(B) Motor neurons
(C) Associative neurons
(D) None of these

Submitted By :Ali Uppal

Secretin is a hormone produced by___________?

(A) Stomach
(B) Liver
(C) Pancreas
(D) Duodenum

Submitted By :Ali Uppal

Which of the following statement about neuron is incorrect___________________?

(A) They not only conduct impulses but also generate them
(B) They are not the only cellular component of nervous system
(C) They may show limited regenerative capabilities
(D) Like all the living cell, when they mature and divide to form similar cells

Submitted By :Ali Uppal

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