Description : The four sketches (A, B, C and D) given below, represent four different types of animal tissues. Which one of these is correctly identified in the options given, along with its ... Smooth Heart Heart muscle contraction tissue (d) (A) Columnar Nephron Secretion epithelium and absorption
Last Answer : (a) (B) Glandular Intestine Secretion epithelium
Description : Why can cardiac muscle fibres contract for longer periods than skeletal fibres? (a) Cardiac muscle is self-excitatory (b) Extracellular calcium partially controls the strength (and length) ... tubules are more developed in cardiac muscle (d) Cardiac muscle is uninucleate rather than multinucleate
Last Answer : Ans:(a)
Description : Bundles of striated muscle fibres called fasciculi are surrounded by a sheath called :-
Last Answer : Bundles of striated muscle fibres called fasciculi are surrounded by a sheath called :- A. Epimysium B. Perimysium C. Exomysium D. Endomysium
Description : Muscle fibres having rounded ends are
Last Answer : Muscle fibres having rounded ends are A. Unstriped muscles B. Smoothe muscles C. Striated muscles D. All the above
Description : In human body, ligaments are made up of (1) white fibres and some yellow elastic fibres (2) white fibres only (3) yellow fibres only (4) yellow fibres and muscle fibres
Last Answer : (1) white fibres and some yellow elastic fibres Explanation: A ligament is composed of dense fibrous bundles of collagenous fibres and spindle-shaped cells known as fibrocytes, with little ground ... ligament is rich in elastic fibres, which are quite tough even though they allow elastic movement.
Description : The felderstrukter fibres of the extraocular musclea. form the bulk of the orbital part of the muscle b. have poorly developed sarcoplasmic reticulum c. are singly innervated d. are more richly supplied by blood than the fibrillenstrukter fibres
Last Answer : have poorly developed sarcoplasmic reticulum
Description : The muscle spindles: a. are extrafusal fibres b. are innervated by type Ia and II fibres c. received motor innervation from the gamma fibres. d. respond to tension in the muscle
Last Answer : are innervated by type Ia and II fibres
Description : Stretch reflex: a. is a monosynaptic reflex with a response time of 1 msec b. originates in the muscle spindle which sends off impulses in type Ia nerve fibres c. is intensified by impulses in the gamma efferent fibres d. all above
Last Answer : all above
Description : Hypersecretion of growth hormone in adults does not cause further increase in height, because (a) epiphyseal plates close after adolescence (b) bones loose their sensitivity to growth hormone in adults (c) muscle fibres do not grow in size after birth (d) growth hormone becomes inactive in adults.
Last Answer : (a) epiphyseal plates close after adolescence
Description : Blood capillaries are made of (a) endothelium, connective tissue and muscle fibres (b) endothelium and muscle fibres (c) endothelium and connective tissue (d) endothelium only.
Last Answer : d) endothelium only.
Description : The pacesetter in the heart is called (a) sino-atrial node (SAN) (b) atrio-ventricular node (AVN) (c) Purkinje fibres (d) papillary muscle.
Last Answer : (b) atrio-ventricular node (AVN)
Description : Bundle of His is a network of (a) muscle fibres distributed throughout the heart walls (b) muscle fibres found only in the ventricle wall (c) nerve fibres distributed in ventricles (d) nerve fibres found throughout the heart.
Last Answer : (b) muscle fibres found only in the ventricle wall
Description : Characteristics of smooth muscle fibres are (a) spindle-shaped, unbranched, nonstriated, uninucleate and involuntary (b) spindle-shaped, unbranched, unstriped, multinucleate and involuntary (c ... , multinucleate and involuntary (d) cylindrical, unbranched, striated, multinucleate and voluntary.
Last Answer : (a) spindle-shaped, unbranched, nonstriated, uninucleate and involuntary
Description : Which one of the following contains the largest quantity of extracellular material? (a) Striated muscle (b) Areolar tissue (c) Stratified epithelium (d) Myelinated nerve fibres
Last Answer : (b) Areolar tissue
Description : Which one of the following is correct pairing of a body part and the kind of muscle tissue that moves it? (a) Biceps of upper arm – S m o o t h m u s c l e fibres (b) Abdominal wall – Smooth muscle (c) Iris – Involuntary smooth muscle (d) Heart wall – Involuntary unstriated muscle
Last Answer : (b) Abdominal wall – Smooth muscle
Description : Hypersecretion of Growth Hormone in adults does not cause further increase in height, because: (1) Epiphyseal plates close after adolescence. (2) Bones loose their sensitivity to Growth Hormone in adults. ( ... fibres do not grow in size after birth. (4) Growth Hormone becomes inactive in adults.
Last Answer : (1) Epiphyseal plates close after adolescence.
Description : Adrenergic β2 agonists produce muscle tremor by: A. Facilitating neuromuscular transmission B. Incomplete fusion of contractile response of individual fibres C. Enhanced firing of muscle spindles D. Both (b) and (c) are correct
Last Answer : D. Both (b) and (c) are correct
Last Answer : white fibres and some yellow elastic fibres
Description : State the function of a) sieve tubes b) sieve plate c) companion cells d) phloem fibres.
Last Answer : a) Sieve tubes: They play an important role in the conduction of food. b) Sieve plate: It allows the food to pass through the pores. c) Companion cells: They control the passage of food through the phloem. d) Phloem fibres: They provide tensile strength to the plant body.
Description : What are Purkinje fibers? What is the function of the Purkinje fibres? -Biology
Last Answer : answer:
Description : What is the function of the spindle fibres? -Biology
Last Answer : Spindle fibers form a protein structure that divides the genetic material in a cell. The spindle is necessary to equally divide the chromosomes in a parental cell into two daughter cells during ... division: mitosis and meiosis. During mitosis, the spindle fibers are called the mitotic spindle.
Description : What is the function of xylem fibres. -Biology
Last Answer : The xylem is the vascular tissue responsible for the upward conduction of water and nutrients from the roots. The xylem tissue moves water and nutrients to various parts of the plant such as shoots and leaves. Its major components include xylem parenchyma, xylem fibers, tracheids, and xylem vessels
Description : Phloem fibres function? -Biology
Last Answer : Bast fibre (also called phloem fibre or skin fibre) is plant fibre collected from the phloem (the "inner bark", sometimes called "skin") or bast surrounding the stem of certain dicotyledonous plants. They support the conductive cells of the phloem and provide strength to the stem.
Description : The positive inotropic action of digoxin takes several hours to develop because: A. Binding of digoxin to Na+K+ATPase is slow B. After Na+K+ATPase inhibition by digoxin, Ca2+ loading of myocardial ... +ATPase through modification of gene function which takes time D. Both A' and B' are correc
Last Answer : D. Both ‘A’ and ‘B’ are correct
Description : Name two textile industries using any animal fibres. Name an important State where these industries are located. -Geography
Last Answer : Two textiles industries are : 1. Woollen Industry State—Punjab. 2. Silk Industry State—Karnataka.
Description : State the uses of (i) Glass Fibres (ii) Asbestos Fibres.
Last Answer : Uses of Glass Fibres : 1. Used as filter in air conditioners. 2. Used as fine aggregate for finishing plaster to reduce cracking. 3. Used with plastic to produce glass reinforced plastic (GRP), ... 5. It is used for thermal insulation work for pipe line. 6. Used in electrical insulation work.
Description : Our major foods, fibres, spices, fruits and beverage crops are (a) Flowering plants (b) Gymnospermous plants (c) Pteridophytes (d) Bryophytes
Description : Which fiber is chemcially identical to cotton fibres?
Last Answer : Rayon
Description : Our major foods; fibres; spices; fruits and beverage crops are?
Last Answer : flowering plants
Description : Identify the two components of Phloem tissue that help in transportation of food in plants (a) Phloem parenchyma & sieve tubes (b) Sieve tubes & companion cell. (c) Phloem parenchyma & companion cell. (d) Phloem fibres and sieve tubes
Last Answer : (b) Sieve tubes & companion cell.
Description : The process of chipping wood and making into fibres is called
Last Answer : pulping.
Description : Messages in optic fibres reach faster.
Last Answer : As photons travel much faster than electrons.
Description : Give reasons: a) Optic fibres do not corrode.
Last Answer : As optic fibres do not react with air or water
Description : What are the merits / advantages of optical fibres?
Last Answer : a) Optic fibres do not interact with air or water, so it does not corrode. b) Messages reach the destination much faster as photons transmit much faster than electrons. c) Optic fibres can transmit
Description : Why are optical fibres used in telecommunication and networking?
Last Answer : Optical fibres are flexible and can be bundled as cables hence it is used in telecommunication and networking.
Description : Mention the uses of optical fibres.
Last Answer : Optical fibres are used as a medium for telecommunication and networking.
Description : The tissues in which the fibres in the matrix are loosely arranged is called loose
Last Answer : connective tissue.
Description : Give reason: White and yellow fibres in cartilage are not easily visible.
Last Answer : The refractive index of the fibres and the matrix are same. Hence they are not easily visible
Description : Name the three types of fibres found in the areolar tissue.
Last Answer : a) White fibres or collagen fibres found in groups. b) Yellow fibres or elastic fibres found singly. c) Reticular fibres, forming a network.
Description : Why are fibres used in making gunny bags and ropes?
Last Answer : Sclerenchyma fibres are flexible and elastic; hence they are used in coir industries to make gunny bags and ropes.
Description : What are fibres and sclereids?
Last Answer : Sclerenchyma cells consisting of elongated, thread like thick walled cells are called fibres. Sclerenchyma cells consisting of hard cells found in group and having more lignin are called sclereids. The cells of sclereids are isodiametric or columnar or bone shaped or star shaped
Description : What are optical fibres? Give three applications of these fibres.
Last Answer : Ans. Optical fibres are tubes of glass which transmit light without significant absorption of light energy. T.I.R is the phenomenon used for this purpose. It is used for (i) Communication, (ii) Bio-medical engineering and (iii) Medical applications without operating the patient.
Description : Name two textile industries using animal fibres. -SST 10th
Last Answer : Animal fibres Important Centres Silk industry Kashmir; Karnataka—Bangalore and Mysore. Woollen industry Punjab and Haryana—Dhariwal, Amritsar, Ludhiana; Uttar Pradesh— Kanpur; Madhya Pradesh—Gwalior.
Description : Name the process by which silk and wool fibres are made into fabric. -Science-7
Last Answer : Wool and Silk are made into fabric by the process of weaving.
Description : Optical fibres are made up of thin strands of (a) copper material (b) silver material (c) glass like material -Technology
Last Answer : (c) Optical fibres are made up of thin strands of glass like material.
Description : What are spindle fibres? -Biology
Description : What organelles produce spindle fibres? -Biology
Last Answer : Centrioles produce spindle fibers in animal cells. These spindle fibers are active during mitosis when the DNA has replicated and the chromosomes are pulled apart during anaphase. Plants cells do not have centrioles but they still undergo mitosis.
Description : Centrioles are present only in animals. In such a case how the spindle fibres are held in the cell division of plants? -Biology
Description : Optic fibres are mainly used for which purpose? -Do You Know?