Important Questions for Class 11 Biology 20th Chapter Locomotion and Movement MCQ, Very Short, Short Type, Long Type
CBSE Class 11 Important Questions for Class 11 Biology Chapter 20 Locomotion and Movement all MCQ Type, Very Short Type, Assertion Reason Type, Case Study, Short Type and Long Type Questions with Answers by Expert. Important Questions for Section A, B, C, D Class 11 Biology Chapter 20.
- MCQs
(1) Passage of ova through the female reproductive tract is also facilitated by
(a) amoeboid movement
(b) ciliary movement
(c) muscular movement
(d) None of the above
(2) The endoplasmic reticulum commonly called the sarcoplasmic reticulum of the muscle fibers is the store house of
(a) Calcium ions
(b) Ferric ions
(c) Cupric ions
(d) Magnesium ions
(3) Assertion: Each vertebra has a central hollow portion known as the neural canal.
Reason: the spinal cord passes through the neural canal
a.) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
b.) Both Assertion and Reason are correct and Reason is not the correct explanation for Assertion.
c.) If assertion is true but the reason is false.
d.) If both assertion and reason are false.
(4) Assertion: The Ribs have two articulation surfaces on its ventral end
Reason: the ribs in humans are tricephalic
a.) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
b.) Both Assertion and Reason are correct and Reason is not the correct explanation for Assertion.
c.) If assertion is true but the reason is false.
d.) If both assertion and reason are false.
(5) Assertion: The 8th, 9th and 10th pairs of ribs do not articulate directly with the sternum
Reason: hence they are called true ribs
a.) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
b.) Both Assertion and Reason are correct and Reason is not the correct explanation for Assertion.
c.) If assertion is true but the reason is false.
d.) If both assertion and reason are false.
(6) Assertion: In Paramecium, cilia help in the movement of food through cytopharynx and in locomotion
Reason: Muscle fibers are present in paramecium
a.) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
b.) Both Assertion and Reason are correct and Reason is not the correct explanation for Assertion.
c.) If assertion is true but the reason is false.
d.) If both assertion and reason are false.
(7) Muscle is a specialized tissue of _______origin.
(a) Endoderm
(b) Mesoderm
(c) Ectoderm
(d) Hypoblast
(8) Assertion: Muscle fibre is a syncytium
Reason: it has sarcoplasm which contains many nuclei.
a.) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
b.) Both Assertion and Reason are correct and Reason is not the correct explanation for Assertion.
c.) If assertion is true but the reason is false.
d.) If both assertion and reason are false.
(9) Inflammation of the joints caused by the buildup of uric acid crystals is
(a) Gout
(b) Tetany
(c) Arthritis
(d) Osteoporosis
(10) the joins which do not allow any movement is
(a) Fibrous joints
(b) cartilaginous joints
(c) Synovial joints
(d) None of the above
ANSWER IN ONE SENTENCE
(1) What is the purpose of locomotion?
Ans. Generally, locomotion is used to find food, shelter, a mate, adequate breeding grounds, favorable climatic conditions, or to flee from enemies/predators.
(2) What is the cytopharynx?
Ans. Cilia in Paramecium aids in the transportation of food through the cytopharynx as well as motility.
(3) What are the types of muscles?
Ans. Muscles are classified into three types based on their location: (i) skeletal, (ii) visceral, and (iii) cardiac.
(4) Name the bones in the ear Ossicles
Ans. Malleus, Incus and Stapes are the bones forming the Ear Ossicles.
(5) What is sarcomere?
Ans. A sarcomere is a functional unit of contraction that is defined as the portion of the myofibril between two successive ‘Z’ lines.
(6) What are the components of skeleton system and how is it classified?
Ans. The Skeleton system in humans is made up of 206 bones and a few cartilages. It is classified into two types: axial and appendicular skeleton.
- ANSWER IN SHORT
Q.1) Why are visceral muscles called smooth muscles?
Ans. 1.) Visceral muscles are found in the interior walls of hollow visceral organs such as the alimentary canal, reproductive tract, and so on.
2.) They have no striation and are smooth in appearance. As a result, they are known as smooth muscles (nonstriated muscle)
Q.2) What is difference in bone and cartilage?
Ans. 1.) Bone and cartilage are two types of specialized connective tissues.
2.) The bone is a highly rigid matrix due to the presence of calcium salts, whereas the cartilage has a slightly flexible matrix due to the presence of chondroitin salts.
Q.3) Describe the structure of pelvic girdle
Ans. 1.) The pelvic girdle is made up of two coxal bones.
2.) Each coxal bone is made up of the fusion of three bones: the ilium, the ischium, and the pubis.
3.) A cavity termed the acetabulum exists at the point of fusion of the upper bones, into which the thigh bone articulates.
4.) The pubic symphysis is formed when the two portions of the pelvic girdle connect ventrally to produce the pubic symphysis, which contains fibrous cartilage.
Q.4) Describe the structure of the pelvic girdle?
Ans. 1.) The pelvic girdle is made up of two coxal bones.
2.) Each coxal bone is made up of the fusion of three bones: the ilium, the ischium, and the pubis.
3.) A cavity termed the acetabulum exists at the point of fusion of the upper bones, into which the thigh bone articulates.
4.) The pubic symphysis is formed when the two portions of the pelvic girdle connect ventrally to produce the pubic symphysis, which contains fibrous cartilage.
Q.5) What are myofilaments? Describe its structure.
Ans. 1.) The presence of a high number of parallelly organized filaments in the sarcoplasm called myofilaments or myofibrils is a distinguishing feature of muscle fibers.
2.)The bright bands, known as I-bands or Isotropic bands, contain actin, whereas the dark bands, known as ‘A’ bands or Anisotropic bands, include myosin.
3.) Both proteins are organized as rod-like structures parallel to each other and to the myofibrils’ longitudinal axis.
Q.6) During contraction, the ‘I’ bands get reduced, whereas the ‘A’ bands retain the length. Justify.
Ans. 1.) The portion of the myofibril between two successive ‘Z’ lines is considered as the functional unit of contraction and is called a sarcomere.
2.) During contraction, the ‘Z’ lines attached to the actins are pulled inwards thereby causing a shortening of the sarcomere.
3.) Hence, during shortening of the muscle, i.e., contraction, the ‘I’ bands get reduced, whereas the ‘A’ bands retain the length.
- ANSWER IN BRIEF
Q.1) State the different types of joints and describe any one in detail
Ans. 1.) Fibrous, cartilaginous, and synovial joints are the three basic structural types of joints.
2.) The presence of a fluid-filled synovial space between the articulating surfaces of the two bones distinguishes synovial joints.
3.) Such an arrangement allows for a lot of movement.
4.) These joints aid in locomotion and a variety of other activities.
5.) Some examples are the ball and socket joint (between the humerus and the pectoral girdle), the hinge joint (knee joint), the pivot joint (between the atlas and the axis), the gliding joint (between the carpals), and the saddle joint (between the carpal and metacarpal of the thumb).
Q.2) Describe in detail of disorders of muscular and skeletal system?
Ans. 1.) Myasthenia gravis is an auto immune condition that affects the neuromuscular junction, causing fatigue, weakness, and paralysis of the skeletal muscle.
2.) Muscular dystrophy is a progressive degradation of skeletal muscle caused mostly by a hereditary disease.
3.) Tetany is Muscle spasms (wild contractions) caused by low Ca++ levels in the bodily fluid.
4.) Arthritis is a joint inflammation.
5.) Osteoporosis is an age-related condition characterised by decreasing bone mass and an increased risk of fractures. A typical cause is low oestrogen levels.
6.) Gout is an inflammation of the joints caused by the buildup of uric acid crystals.
Q.3) Describe in brief components of the vertebral column in humans.
Ans. 1.) In the humans, vertebral column is made up of 26 serially ordered pieces called vertebrae that are oriented dorsally.
2.) It starts from the base of the skull and serves as the trunk’s major framework.
3.) The spinal cord passes through a central hollow section (neural canal) in each vertebra.
4.) The atlas is the first vertebra and articulates with the occipital condyles.
5.) Starting from the head, the spinal column is divided into cervical (7), thoracic (12), lumbar (5), sacral (1-fused), and coccygeal (1-fused) sections.
6.) In practically all mammals, including humans, the number of cervical vertebrae is seven.
7.) The vertebral column protects the spinal cord, supports the head, and serves as the attachment point for the ribs and back musculature.