biology MCQs – Page 39

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 Review each marked answer and report any item that may be outdated or unclear.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
761. Which of the followings is missing from the nervous system of planaria_____________?
comments icon0

A. Longitudinal nerves

B. none of these

C. Ganglia

D. Lateral nerves

762. Which of the following neuron has a single long dendron?
comments icon0

A. none of these.

B. Sensory neuron

C. Associative neuron

D. Motor neuron

763. NADPH2 provides___________?
comments icon0
A. All of these

B. chemical energy

C. assimilatory power

D. energized electrons

764. Which of the followings are effectors______________?
comments icon0

A. Muscles

B. Glands

C. Sensory organs

D. Both a & b
765. Of the following, which one light gathering?
comments icon0

A. Reaction centre

B. Photosystem

C. None of these

D. Antenna complex
766. Parabronchi are open at ______________ end/s?
comments icon0

A. None of these

B. Single

C. Both

D. Do not have opening

767. The most important photosynthetic pigment is ___________?
comments icon0

A. Carotenes

B. Chlorophyll a

C. Chlorophyll b

D. Xanthophyll

768. Voice box is another name used for___________?
comments icon0

A. Chest Cavity

B. Pharynx

C. Buccal cavity

D. Larynx
769. Higher turgor pressure in a plant cell is maintained by________________?
comments icon0

A. Large number of vacoules in a plant cell.

B. Higher ionic concentration inside vacuoles resulting from active pumping of ions at their tonoplastic membrane

C. Higher osmotic pressure of the cell vacuole

D. both b and c
770. Megaphylls i.e. leaves with divided veins with an expanded lamina is a dharacteristic of ___________________?
comments icon0

A. Lycopods

B. Ferns

C. Seed plants

D. Both b and c
771. Ecdysone is_________________?
comments icon0
A. A hormone that regulates moulting in arthropods

B. An enzyme that digest endocuticle during an arthropodal ecdysis

C. A newly formed exoskeleton in authropods

D. A process that involves moulting

772. Which of the following tracheophytes are also called arthrophytes______________?
comments icon0
A. Sphenopsids

B. Prteropsids

C. Psilopsids

D. Lycopsids

773. What is the function of synapse________________?
comments icon0

A. To provide cytoplasmic connection between neurons.

B. To stop the nerve impulse

C. To allow nerve impulse to move in backward direction

D. To decrease the speed of nerve impulse
774. PS I has chlorophyll a molecule which absorbs maximum light of _________ nm ?
comments icon0

A. 650

B. 700

C. 600

D. 680

775. When abdomen expands, the number of spiracles open is_____________?
comments icon0

A. 6

B. 2

C. 8

D. 3

776. The first action spectrum was obtained by___________?
comments icon0

A. T.W.Inws

B. W.Stapes

C. T.W.Englemam

D. Malleus

777. Diameter of thick filament is____________?
comments icon0
A. 16nm

B. 7 nm.

C. 10-100 ?m.

D. 8 nm

778. Which of the following feature is not related to neuron?
comments icon0

A. Reflex

B. Regeneration

C. Movement

D. Conduction

779. Which of the following pairs of fins in a fish body are paired?
comments icon0

A. Dorsal and ventral.

B. Tail and anal

C. All of these

D. Pectoral and Pelvic.
780. Functional units of lungs are called________?
comments icon0

A. None of these

B. Air sacs

C. Parabronchi

D. Alveoli