biology MCQs – Page 46

Practise multiple-choice questions from biology for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

biology Mcqs
901. Epinasty is controlled by_____________?
comments icon0

A. Abscisins

B. Cytokinins

C. Gibberellins

D. Auxins
902. Roots of a plant show______________?
comments icon0

A. Negative tactic movement and positive tropic movement

B. Positive geotropism of stem and roots

C. Positive phototropism and negative geotropism

D. Negative phototropism and positive geotropism
903. Which of the following statement about filicinae a group of tracheophytes is incorrect_________________?
comments icon0

A. They live in shady and moist areas.

B. They are seedless and their leaves are called fronds

C. They belong to sphenopsida

D. They show circinate vernation.

904. Central nervous system of man consists of______________?
comments icon0

A. Brain

B. Spinal cord

C. Both of these

D. none of these

905. Percentage of CO2 carried as carboxyhaemoglobin is_________?
comments icon0
A. 20%

B. 70%

C. 10%

D. 5%

906. Which of the following step occurs immediately after binding of Ca2+ with troponin molecule during muscle contraction.
comments icon0

A. Ca2+ goes back inside sarcoplasmic reticulum.

B. Troponin uncovers the actin binding sites.

C. Tropomyosin gets removed from the binding sites of actin filaments.

D. Binding sites of actin get attached to the myosin head.

907. Chemically auxins are____________?
comments icon0

A. Indole propionic acid.

B. Indole acetaldehyde

C. Indole carboxylic acid.

D. Indole acetic acid.
908. In Hornworts the band of meristematic tissue is found near_____________?
comments icon0
A. At junction of A & B

B. Gamete producing region

C. Foot

D. Spore producing region

909. Number of pairs of cranial nerves is__________?
comments icon0

A. 11

B. 10

C. 12

D. 13

910. Which of the following allows precise muscular movements_______________?
comments icon0

A. Thalamus

B. Cerebrum

C. Cerebellum

D. Hypothalamus

911. Maximum speed of nerve impulse transmission is____________?
comments icon0

A. 110 m/sec

B. 100 m/sec

C. 130 m/sec.

D. 120m/sec
912. Maintenance of normal resting potential via movement of K+ inside the cell and na+ out is a/an ___________ process?
comments icon0
A. Active

B. Passive

C. None of these.

D. Diffusional

913. Megaphylls are characteristic for____________?
comments icon0

A. Ferns

B. Seed plants

C. Both of these

D. None of these

914. Hornwarts are included in sub-class of __________?
comments icon0

A. Hepaticopsida

B. Anthoceropsida

C. Bryopsida

D. Psilopsida

915. Which type of the receptors are present in the ear__________________?
comments icon0

A. Photoreceptors

B. Chemoreceptors

C. Thermoreceptors

D. Mechanoreceptors
916. Graves disease is produced due to____________?
comments icon0

A. Overproduction of corticosteroids

B. Overproduction of thyroxin

C. Undersecretion of thyroxin

D. Undersecretion of corticosteroids

917. In alcoholic fermentation Pyruvic acid is broken down into?
comments icon0

A. Acetaldehyde

B. Lactic acid

C. Ethyl alcohol

D. Methyl alcohol

918. Which of the following light is least absorbed by the plants?
comments icon0

A. Red

B. Blue

C. Orange

D. Green
919. Protonema is___________?
comments icon0

A. Fungus like

B. Plant like

C. Algae like

D. Thallus like

920. Which of the following is a uni-nucleated cell?
comments icon0

A. All of these

B. A skeletal muscle cell.

C. A cardiac muscle cell.

D. A smooth muscle cell.