Biology 751-800 MCQs

Biology

751. Chemically auxins are _________ ?

a. Indole propionic acid

b. Indole carboxylic acid

c. Indole acetaldehyde

d. Indole acetic acid

752. Gibberellins may be substituted for _________ light, therefore promote flowering in long day plants?

a. White

b. Red

c. Blue

d. Green

753. 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 these

754. 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. Ethene

755. The only promoter of leaf senescence in the following plant hormones is _________ ?

a. Gibberellins

b. Cytokinins

c. Auxins

d. Abscisic Acid

756. Which of the following is used in brewing industry to promote malting _________ ?

a. Gibberellins

b. Cytokinins

c. Auxins

d. Abscisic Acid

757. Which type of the receptors are present in the ear __________ ?

a. Chemoreceptors

b. Mechanoreceptors

c. Photoreceptors

d. Thermoreceptors

758. Type of sensations carried by nociceptors are _________ ?

a. Touch

b. Temperature

c. Pressure

d. Pain

759. Which type of sensory structures carrying the touch sensations are present in papillae extending into ridges of the fingertips _________ ?

a. Hair end organs

b. Meissner's Corpuscles

c. Pacinian corpuscles

d. None of these

760. Which type of sensory structures carry deep pressure and vibration sensations _________ ?

a. Hair end organs

b. Meissner's Corpuscles

c. Pacinian corpuscles

d. None of these

761. __________ is simplest form of learning.

a. Imprinting

b. Habituation

c. Insight learning

d. Latent learning

762. __________ was first to propose on objective definition of instinct.

a. Thorpe

b. Darwin

c. Pavlov

d. Kohler

763. Types of behaviour enabling pillbugs to reach moist area is __________ ?

a. Kinesis

b. Taxes

c. Instinct

d. Learning

764. Nissl's granules are present in which part of the neuron _________ ?

a. Axoplasm

b. Myelin sheath

c. Dendrite

d. Soma

765. All of the following are similarities between nervous and endocrine system except: _________ ?

a. Produce chemical messengers

b. Release chemical messengers in extracellular space

c. Homostatic in function

d. Having slow but prolonged effects

766. 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

767. Secretin is hormone produced by _________ ?

a. Stomach

b. Liver

c. Pancreas

d. Duodenum

768. Type of neurons found exclusively in CNS are __________ ?

a. Sensory neurons

b. Motor neurons

c. Associative neurons

d. None of these

769. 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 these

770. Cell membrane under resting conditions is impermeable to all the ions except __________ ?

a. Na+

b. K+

c. Cl-

d. PO4-2

771. Grave's disease is produced due to _________ ?

a. Under-secretion of thyroxin

b. Overproduction of thyroxin

c. Under-secretion of corticosteroids

d. Overproduction of corticosteroids

772. MSH is produced from __________ ?

a. Anterior pituitary

b. Median pituitary

c. Posterior pituitary

d. None of these

773. At the induction of action potential opening of Na+ gate with influx of Na+ is a _________ processes?

a. Active transport

b. Passive transport

c. Diffusion

d. None of these

774. Acromegaly is caused due to over-secretion of __________ ?

a. STH

b. TSH

c. ACTH

d. Thyroxin

775. Insulin and glucagons are __________ in nature.

a. Protein

b. Amino acid derivative

c. Polypeptide

d. Steroid

776. Normal resting membrane potential of a neuron is __________ ?

a. - 50 mv

b. - 60 mv

c. -70 mv

d. - 80 mv

777. Insufficient secretion of iodo thyroxine in adults causes _________ ?

a. Myxedema

b. Cretinism

c. Goiter

d. Exophthalmic goiter

778. Normal action potential of a neuronal cell is __________ ?

a. plus 50 mv

b. plus 60 mv

c. plus 70 mv

d. plus 80 mv

779. Number of pairs of cranial nerves is __________ ?

a. 10

b. 11

c. 12

d. 13

780. Na+ -K+ ATPase pump is important for _________ ?

a. Maintenance of resting potential

b. Massive out flux of K+ after depolarization

c. Recovery of resting potential

d. Conversion of resting potential into action potential

781. Which of the following has no central nervous system _________ ?

a. Hydra

b. Man

c. Planaria

d. Cockroach

782. Maximum speed of nerve impulse transmission is __________ ?

a. 100 m/sec

b. 110 m/sec

c. 120 m/sec

d. 130 m/sec

783. Which of the following are responsible for the detection of changes in environment?

a. Receptors

b. Neurons

c. Effectors

d. All of these

784. Any change in the environment of an organism is called __________ ?

a. Stimulus

b. Variation

c. Response

d. Reaction

785. Co-ordination results in _________ ?

a. Regulation of body functions

b. Organization of body functions

c. Integration of body functions

d. All of these

786. Which of the followings are effectors _________ ?

a. Muscles

b. Glands

c. Sensory organs

d. Both 'a' & 'b'

787. Hydra has _________ ?

a. Brain

b. Nerves

c. Neuron-cells

d. All of these

788. Co-ordination in man is brought about by _________ ?

a. Nervous system

b. Endocrine system

c. Both of these

d. None of these

789. Which of the followings is missing from the nervous system of Planaria _________ ?

a. Ganglia

b. Longitudinal nerves

c. Lateral nerves

d. None of these

790. Which of the following transmits nerve impulse from receptors to central nervous system?

a. Sensory neuron

b. Motor neuron

c. Associative neuron

d. None of these

791. In which of the following neurons length of dendrite is greater than axon _________ ?

a. Sensory neuron

b. Motor neuron

c. Associative neuron

d. None of these

792. Which of the following neuron has a single long dendron?

a. Sensory neuron

b. Motor neuron

c. Associative neuron

d. None of these

793. Which of the following cytoplasmic extensions carry the message toward the cell body _________ ?

a. Dendrites

b. Axon

c. Both of these

d. None of these

794. Microscopic gaps between the neuron endings are called _________ ?

a. Transmitters

b. Synapses

c. Pores

d. Nodes

795. What is the function of synapse _________ ?

a. To allow nerve impulse to move in backward direction

b. To decrease the speed of nerve impulse

c. To stop the nerve impulse

d. To provide cytoplasmic connection between neurons

796. Under resting membrane potentials:

a. Outer surface of neuron is more positive

b. Inner surface of neuron is more positive

c. Both of these surfaces are equally positive

d. None of these

797. Which of the following ions are involved in the initiation of nerve impulse _________ ?

a. Na+

b. K+

c. Fe

d. None of these

798. Central nervous system of man consists of _________ ?

a. Brain

b. Spinal cord

c. Both of these

d. None of these

799. Reflex actions below the neck are under control of _________ ?

a. Brain

b. Spinal cord

c. Hypothalamus

d. None of these

800. Which of the following is present inside the vertebral column _________ ?

a. Brain

b. Spinal cord

c. Both of these

d. None of these

Biology 701-750 MCQs

Biology

701. Four daughter cells are given to rise during the process of _________ ?

a. meiosis

b. mitosis

c. cell division

d. none of these

702. Which of the following gives to rise two daughter cells during cell division?

a. meiosis

b. mitosis

c. both a & b

d. none of these

703. In animals meiosis produces _________ ?

a. spores

b. gametes

c. both a & b

d. all the above

704. Prokaryotic and eukaryotic are two types of _________ ?

a. cells

b. tissues

c. organs

d. organisms

705. Cells are of __________ types?

a. 4

b. 3

c. 2

d. 1

706. Gametophyte of Psilopsida develops a symbiotic association with which of the following __________ ?

a. Algae

b. Bacteria

c. Protozoa

d. Fungus

707. Which of the following is an example of the living member of Psilopsida _________ ?

a. Rhynia

b. Psilophyton

c. Psilotum

d. Cooksonia

708. In term of spore production Selaginella is characterized by _________ ?

a. Homosporous

b. Heterosporous

c. Both depending upon the conditions

d. None of these

709. Which of the following tracheophytes are also called arthrophytes _________ ?

a. Psilopsida

b. Lycopsida

c. Sphenopsida

d. Pteropsida

710. Equistem is an example of _________ ?

a. Psilopsida

b. Lycopsida

c. Sphenopsida

d. Pteropsida

711. Bryophytes are called amphibians of plant world because:

a. Bryophytes like amphibian ancestors are one of the most primitive organisms in this world.

b. Bryophytes like amphibian live  in damp shady places and close to water body.

c. Amphibians have close relation with bryophytes in their habitat.

d. All of these

712. Today the land habitat is dominated by _________ ?

a. Fungi

b. Gymnosperms

c. Angiosperms

d. Tracheophytes

713. Hornworts are included in sub-class of _________ ?

a. Anthoceropsida

b. Bryopsida

c. Hepaticopsida

d. Psilopsida

714. Of the following which one is not the characteristic of the plants included in psilopsida _________ ?

a. Gametophyte is colourless

b. They have mycorrhizal association

c. Rhizoids bear Rhizome

d. Aerial branches have veinless outgrowths

715. Horsetail are included in class of _________ ?

a. Sphenopsida

b. Lycopsida

c. Psilopsida

d. Pteropsida

716. Megaphylls are characteristic for _________ ?

a. Ferns

b. Seed plants

c. Both of these

d. None of these

717. In bryophytes fertilization takes place in _________ ?

a. Antheridia

b. Archegonia

c. Water

d. Ovule

718. The dichotomously branching system has shape similar to _________ ?

a. U

b. R

c. Y

d. Fork

719. Which of the following statement about alternation of generation in bryophytes is incorrect?

a. It involves alternation of morphologically different generations

b. Their gametophyte is independent while sporophyte depends upon gametophyte for nutrition.

c. Both the gametophyte and sporophytes are haploid generations thus can produce haploids gametes to continue the diploid number on fertilization

d. Spore formation occurs through meiosis

720. The space between the overtopped dichotomous branches was occupies by a sheet of _________ cells during evolution of megaphylls?

a. Sclerenchyma

b. Chlorenchyma

c. Parenchyma

d. Collenchyma

721. Production of two types of spores is known as _________ ?

a. Heterospory

b. Homospory

c. Heterogamy

d. Gamospory

722. The zygote formed in liverworts is _________ ?

a. Unicellular

b. Multicellular

c. Multinucleate

d. None of these

723. Ground pries are also known as _________ ?

a. Lycopods

b. Spike mosses

c. Both of these

d. None of these

724. Sporophyte is _________ ?

a. Monoploid

b. Haploid

c. Diploid

d. Polyploidy

725. Which of the following plant group first formed true leaves _________ ?

a. Psilopsida

b. Lycopsida

c. Sphenopsida

d. Pteropsida

726. Megaphylls i.e. leaves with divided veins with an expanded lamina is a characteristic of _________ ?

a. Lycopods

b. Ferns

c. Seed plants

d. Both b and c

727. Mosses are included in sub-division of _________ ?

a. Anthoceropsida

b. Hepaticopsida

c. Bryopsida

d. Lycopsida

728. The arrangement of unequal dichotomous branches in one plane during evolution of leaves is called ________ ?

a. Overtopping

b. Fusion

c. Webbing

d. Planation

729. The simplest of all bryophytes are _________ ?

a. Thallophytes

b. Embryophytes

c. Mosses

d. Liverworts

730. Which of the following statement about filicinae a group of tracheophytes is incorrect ________ ?

a. They belong to sphenopsida

b. They are seedless and their leaves are called fronds

c. They live in shady and moist areas

d. They show circinate vernation

731. Antheridiophore and archegoniophore are found in _________ ?

a. Marchantia

b. Funaria

c. Both of these

d. None of these

732. Due to which property of Adiantum and example of Filicinae is called Maidenhairfern _________ ?

a. Its short thick branched horizontally growing rhizome

b. Fibrous adventituous roots arise from the lower side of rhizome

c. Shows heteromorphic alternation of generation

d. Stipe (stalk) and rachis of leaf have black smooth and shiny hair like structures

733. Specialized protective coverings around megasporangium which vary in number are called _________ ?

a. Sporangium

b. Integuments

c. Ovule

d. Pericarp

734. Protonema is _________ ?

a. Thallus like

b. Algae like

c. Fungus like

d. Plant like

735. In which group of tracheophytes ovules are born on the exposed surface of megasporophylls __________ ?

a. Spheospsida

b. Filicineae

c. Gymnosperms

d. Angiosperms

736. Pinus Taxus and Picea belong to _________ ?

a. Spheospsida

b. Filicineae

c. Gymnosperms

d. Angiosperms

737. Of the following four options which one is most advanced?

a. Anthoceropsida

b. Bryopsida

c. Hepaticopsida

d. None of these

738. In life cycle of Pinus megaspores produced by megasporangium divide into 4 megaspores by _________ ?

a. Mitosis

b. Meiosis

c. Both depending upon the conditions

d. None of these

739. In Hornworts the band of meristematic tissue is found near _________ ?

a. Foot

b. Gamete producing region

c. Spore producing region

d. At junction of A & B

740. Microspore of a seed plant that contain male gametophyte including the gamete is called _________ ?

a. Pollen grain

b. Ovule

c. Microgametophyte

d. Microsporangium

741. The part of sporophyte which is called sporangium is _________ ?

a. Capsule

b. Foot

c. Stalk

d. None of these

742. Monocots are characterized by _________ ?

a. Number of sepals and petals are 2 or multiple of 2

b. Number of sepals and petals are 3 or multiple of 3

c. Number of sepals and petals are 4 or multiple of 4

d. Number of sepals and petals are 5 or multiple of 5

743. The first cell of the sporophyte generation is __________ ?

a. Oospore

b. Spore mother cell

c. Spore

d. Gamete

744. Which of the following statement about dicots is incorrect _________ ?

a. They have 4 or 5 sepals and petals or their multiple

b. They have parallel vein pattern on their leaves

c. They are both herbaceous and woody

d. Vascular bundles are ring shaped in their stems

745. Maize is an example of _________ ?

a. Monocot

b. Dicot

c. Gymnosperms

d. None of these

746. Stem of Psilophyton an example of psilogsida is differentiated into an underground rhizome and an aerial part both of which are _________ branched.

a. Isotomous

b. Dichotomously

c. Trichotomously

d. Multichotomously

747. Which of the following group of tracheophyta has expanded or scale like leaves which are always arranged in whorls?

a. Psilopsida

b. Lycopsida

c. Sphenopsida

d. Pteropsida

748. Sporangia of which of the following tracheophytes develop singly on the upper side of sporophylls which may or may not be arranged to form strobili _________ ?

a. Psilopsida

b. Lycopsida

c. Sphenopsida

d. Pteropsida

749. Which of the following tracheophytes are leafless?

a. Psilopsida

b. Lycopsida

c. Sphenopsida

d. Pteropsida

750. Chlorosis, i.e., yellowish hue on the leaves results from _________ ?

a. Accumulation of toxic waste products in leaves

b. Deficiency of chlorophyll

c. Short supplies of mineral nutrients in the soil

d. All of these

Biology 651-700 MCQs

Biology

651. Coelom that develops from the archenteron as outpouching is _________ ?

a. Pseudocoelom

b. Enterocoelom

c. Schizocoelom

d. None of these

652. Of the following which one is not found in series proterostomia?

a. Annelida

b. Arthropoda

c. Mollusca

d. Echinodermata

653. In most triploblasts after embryonic development the three layers are represented as _________ ?

a. Separate layers of cells

b. Structures formed from them

c. Structures associated with them

d. Their functions in body

654. The function of coelom is _________ ?

a. To increase the size of the animals

b. To help in the functioning of reproductive system

c. To provide space for the development of organs and systems

d. None of these

655. A sponge of Antarctica which is more than a meter tall is _________ ?

a. Scolymastra joubini

b. Euplectella

c. Spongilla

d. Leucosolenia

656. The sponges in which sperms develop first are included in the category of _________ ?

a. Peritandrous

b. Pertandrous

c. Protendrous

d. Protandrous

657. The skeleton of sponges is made up of _________ ?

a. Calcium

b. Silica

c. Both of these

d. None of these

658. Sperms released in water are carried to the mesenchyme in sponges by __________ ?

a. Amoeboid cell

b. Stipules

c. Spicules

d. Spines

659. The single main opening of the sponge cavity is _________ ?

a. Osculum

b. Ostia

c. Spongocoel

d. None of these

660. 80% of the food of sponges consists of _________ ?

a. Detrital organic particles

b. Zooplankton and small animals

c. Phytoplanktons

d. All of these

661. In sponges fertilization takes place in _________?

a. Ectoderm

b. Mesenchyme

c. Endoderm

d. Uterus

662. Which of the following are motile zooids in cnidarians?

a. Polyps

b. Medusae

c. Both of these

d. None of these

663. Mammals became dominant in _________ ?

a. Proterozoic era

b. Mesozoic era

c. Paleozoic era

d. Cenozoic era

664. Which of the following fishes contained lungs?

a. Lamprey

b. Perch

c. Plaice

d. Dipnoi

665. Notochord is present throughout life in _________ ?

a. Urochordates

b. Cephalochordates

c. Chordates

d. Vertebrates

666. Body is eel like in __________ ?

a. Cyclostomata

b. Chondrichthyes

c. Osteichthyes

d. None of these

667. Body is globular in _________ ?

a. Cake urchin

b. Sea Urchin

c. Sea cucumber

d. Brittle star

668. Second largest phylum of invertebrates is __________ ?

a. Porifera

b. Arthropoda

c. Mollusca

d. Chordata

669. Main blood vessel of arthropods usually:

a. Lies on dorsal side

b. Lies on ventral side

c. Lies on lateral side

d. Is not present

670. _________ are the first group of invertebrates which have developed a closed circulatory system.

a. Nematodes

b. Annelids

c. Arthropods

d. Molluscs

671. Of the following which one is not the characteristic of Kingdom Animalia.

a. All animals are ingestive heterotrophs

b. All animals are eukaryotes

c. All animals develop from the dissimilar gametes i.e. large sperm and small egg

d. It is largest kingdom

672. Coelom is lined by _________ ?

a. Parietal mesoderm

b. Visceral mesoderm

c. Mesoderm

d. Both a & b

673. Porifera range in size from _________ ?

a. Few millimeter wide to more than one meter tall

b. Few centimeter wide to more than one meter tall

c. Few decimeter wide to more than one meter tall

d. One meter wide to more than millimeter tall

674. Enteron in coelenterates acts as _________ ?

a. Digestive cavity

b. Body cavity

c. Transporting cavity

d. All of these

675. All of the following coelenterates show alternation of generation except:

a. Hydra

b. Obelia

c. Aurelia

d. None of these

676. Excretory system of Platyhelminthes consists of _________ ?

a. Nephridia

b. Flame cells

c. Malpighian tubules

d. Nephrons

677. Pseudocoelom develops from _________ ?

a. Blastopore

b. Plastoquinone

c. Blastocoel

d. Splitting of mesoderm

678. Exoskeleton of coelenterates is made up to _________ ?

a. Calcium

b. Silica

c. Chitin

d. Both a & b

679. All of the following are true for Platyhelminthes except _________ ?

a. Flatworms

b. Triploblastic

c. Coelomate

d. Bilateral symmetry

680. Nervous system of nematodes consists of _________ ?

a. Ventral nerve cord

b. Dorsal nerve cord

c. Lateral nerve cord

d. All of these

681. Polychaeta have _________ ?

a. Tentacles

b. Palps

c. Eyes

d. All of these

682. _________ are believed to have common origin with annelids.

a. Nematods

b. Arthropods

c. Molluscs

d. None of these

683. Mantle in molluscs is present over _________ ?

a. Head

b. Ventral muscular foot

c. Dorsal visceral region

d. All of these

684. Prechordates is another name used for ________ ?

a. Echinoderms

b. Hemichordates

c. Vertebrates

d. Chordates

685. True metamorphosis is not present in __________ ?

a. Crustacea

b. Insecta

c. Arachnida

d. Myriapoda

686. Pin warm is common name used for _________ ?

a. Rhabditis

b. Enterobius vermicularis

c. Ancylostoma duodenale

d. Taenia solium

687. Which system is present in nematodes?

a. Sac - like digestive system

b. Tube - like digestive system

c. Circulatory system

d. Respiratory system

688. Which of the following system is segmentally arranged in annelids?

a. Excretory system

b. Digestive system

c. Circulatory system

d. Nervous system

689. The organs of locomotion in annelids are __________ ?

a. Muscles

b. Hydrostatic skeleton

c. Parapodia

d. Setae

690. The number of chromosomes in human cell is _________ ?

a. 48

b. 44

c. 46

d. 26

691. The resolving power of electric microscope is __________ ?

a. 0.2 mm

b. 0.2 nm

c. 0.2 m

d. none of these

692. Free living example of Platyhelminthes is _________ ?

a. Dugesia

b. Fasciola

c. Taenia

d. None of these

693. Psedudocoelom is character of _________ ?

a. Coelenterates

b. Platyhelminthes

c. Aschelminthes

d. Annelids

694. Which of the following statement about plants is incorrect?

a. All are eukaryotes

b. They are multicellular

c. Non-motile organisms

d. They are heterotrophs

695. Antheridia and archegonia are born on __________ in bryophytes.

a. Sporophyte

b. Gametophyte

c. Both of these

d. None of these

696. Which of the following of bryophytes are the simplest one?

a. Porella

b. Funaria

c. Anthocerus

d. Polytrichum

697. Ferns are included in _________ ?

a. Psilopsida

b. Lycopsida

c. Sphenopsida

d. Pteropsida

698. In which cell, ribosomes are of large size and present either on endoplasmic reticulum or free in cytoplasm?

a. Prokaryotic

b. Eukaryotic

c. Both

d. All the above

699. Mitochondria in heart muscles are nearly __________ ?

a. 400

b. 375

c. 350

d. 325

700. Mitochondria in ear lobe cells are nearly __________ ?

a. 40

b. 50

c. 55

d. 60