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Locomotion and Movement Class 11 Important Questions And Answers MCQ PDF

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Locomotion and Movement Class 11 Chapter 20 – Introduction

Locomotion and Movement Class 11:- One of the most significant features exhibited by the  living organisms is movement. Both plants and animals exhibits movement in a wide range of the  variety. 

A simple form of the movement is where unicellular organisms such as the Amoeba exhibits streaming of the protoplasm. Other movements are  movements  of the flagella, cilia, and tentacles. Some of the movements cause to shift from one to another position which are voluntary movements,are known as locomotion. The  examples of locomotion are running, flying, walking, swimming, etc. Movement and the  locomotion are closely linked. All locomotions are the movements but all movements are not locomotions. It varies in different animal to animal. Animals locomote in the search of food, mate, shelter, suitable habitat, suitable climatic conditions or to escape from the  predators. Read this Chapter to know more about locomotion and movement.

Locomotion and Movement Class 11
Locomotion and Movement Class 11

Locomotion and Movement Class 11 – Very Short Answer Type Questions

Q.1. Name  the human body cell/tissues that:

a) Display of  ameboid movement.

b) Display of ciliary movement.

A.1. 

a) Macrophages and the leucocytes. Cytoskeletal elements such as the microfilaments are involved too. 

b) They mostly occurs in the  internal organs that are lined by ciliated epithelium. Cilia in the trachea, ciliated epithelium in fallopian tube.

Q.2. A complete coordinated activity of the muscular _______, _________ systems leads to locomotion.

A.2.  The Skeletal system and  the Neural systems.

Q.3. The cell referring to the sarcoplasm, the sarcoplasmic reticulum, and the sarcolemma. Name the parts of cells that refer to these names.

A.3. Each muscle cell or fibre is lined by the plasma membrane known as the sarcolemma which contains the sarcoplasm. A muscle fibre is a syncytium as sarcoplasm possesses many nuclei. The sarcoplasmic reticulum of  muscle fibres stores the calcium ions.

Q.4. Mark  components of actin filament in the given diagram:

Actin filament
Locomotion and Movement Class 11

A.4. Troponin

         Tropomyosin

         F-actin

Q.5. Write correct sequence of middle ear bones called as ear ossicles starting from the eardrum.

A.5. The sequence of middle ear is-

        Malleus

        Incus

        Stape

Q.6. Write the difference between matrix of the bones and the  cartilage.

A.6. Matrix of the  bones has an inflexible material, which is known as  the ossein and contains calcium salts. Whereas the matrix of cartilage has a flexible material, called Chondrin that may or may not have calcium salts.

Q.7. Where ball and socket joint present in the body?

A.7. Ball and socket joint is present between humerus and the pectoral girdle i.e. the shoulder joints, hip joints, femur bone in t yrs socket pelvic girdle.

Q.8.What do u mean by locomotion?

A.8. Locomotion is defined as  the ability of an organism to move from one place to the another one.

Q.9.Write the different types of locomotion in case of  humans?

A.9.Different types of locomotion are as follows-

1.Walking        2 Running

3.Swimming   4. Jumping

Q.10. State the difference between locomotion and movement?

A.10. Locomotion is defined as the displacement of a body from one place to the another. On the other hand, movement is defined as the displacement of a body or a part of the body from its original position.

Locomotion and Movement Class 11 – Short Answer Types Questions

Q.1. Write the following terms wrt the rib cage:

a) The bicephalic ribs

c) The true ribs

c) The floating ribs.

A.1.

 a) Each rib has two articulating surfaces on the dorsal end and is known as the bicephalic ribs. 

b) True ribs are the first seven pairs of ribs which are ventrally attached to sternum with assistance of the hyaline cartilage and dorsally appended to  thoracic vertebrae. 

c) Floating ribs are  last two pair of the ribs and are not attached ventrally to sternum hence given  the name floating.

Locomotion and Movement Class 11 Quiz

Q.2. Old people usually suffer from inflamed and stiff joints, what is the name of this condition? Give  reasons for the symptoms of this.

A.2. This condition is called Osteoporosis. It is age-related disorder that is symbolized by the diminishing bone mass and higher chances of fractures. In old-aged females Osteoporosis is commonly caused due to the decreasing levels in  estrogen hormones after the  menopause.

Q.3. Name the  hormones causing the fluctuation of the Ca++ level.

A.3.  The two hormones are Parathyroid hormone and Calcitonin.

Q.4. Define Gout?

A.4. It is  inflammation of  joints which is produced due to  buildup of the  uric acid crystals in synovial joints which causes the movement to become painful and difficult.

Q.5. Write significance of the locomotion in the animals?

A.5. In case of  animals, the locomotion plays an important role in helping them to move from one place to the another. Animals moves for many reasons to support their living and existence such as walk, run, jump, fly, swim and to escape from the predators.

Q.6. How and why do muscle contractions derive their energy from?

A.6. They drive energy fom the ATP. Every myosin molecule contains myosin ATPase, an enzyme at the  head part. In  presence of this enzyme along with the  Ca2+, Mg2+ ions,  inorganic phosphate, and the  ADP,  it is disintegrated by the ATP to release energy from  myosin head. This energy causes myosin to cross bridges to bind to the actin. These cross-bridges that are energized, move, resulting in sliding of the thin myofilaments with  thick myofilaments, thereby causing muscle’s contraction.

Locomotion and Movement Class 11 – Long Answer Types Questions-

Q.1. Does the calcium ion concentration in the blood causes tetany in some of the  cases? Compare the fluctuation in the blood calcium with tetany.

A.1. In  regulation of the muscle’s contraction, the calcium ions plays a significant role. Parathyroid hormone (PTH) that is secreted by the parathyroid gland increases the calcium level in  blood. In hypoparathyroidism (PTH deficiency), the level of calcium in the  blood dips which causes an increase in  excitability of the muscles and nerves resulting in the  convulsions and the  cramps. It also produces sustained contractions of muscles of the face, the hands, the feet, and the  larynx. This disorder is called as the parathyroid tetany.

Locomotion and Movement Class 11 Study Materials

Q.2. How slipped disc affects  lower back and the overall health of the body in an organism?

A.2. Bones are protected by intervertebral discs that are situated in between vertebrae. They can absorb the shocks from the everyday activities such as lifting, walking, and twisting. Each of  vertebral discs has the two parts, one is  soft inner portion that is gelatinous and other is the  tough outer ring. In case of any weakness or injury, the inner part protrudes through outer ring and is known as the slipped disc which can cause added pressure on  muscles and nerves surrounding it which affects health in different ways-

1.The numbness and the pain in one side of body.

2.It induces pain that intensifies at the night.

3 It induces the  pain that can spread up to  legs and the arms.

4. It produces pain after the walking or the sitting.

5.Unexplained weakness of muscles.

6.Burning sensation, aching, tingling in areas being affected.

         If it is left untreated,  slipped disc can cause severe damage to  nerves which can remain permanent. In some of the cases, it can cause  nerve impulses to cut off the cauda equina nerves in  legs and the  lower back which  results in loss of the  bladder control.

Q.3. Write  the role  of Ca2+ ions in the contraction of muscles.

A.3. Calcium ions  plays a key role in muscle contraction process. During the  contraction of muscles, from  motor endplate, an action potential passes over sarcolemma and further into T-tubules and the  sarcoplasmic reticulum and triggers it to produce the  Ca2+ ions into the sarcoplasm. Binding of the  calcium ions to  troponin causes its shape and position to change which in turns modifies the  position and shape of the tropomyosin that binds  troponin. This shift presents active sites on  molecule, F-actin which prompts  myosin cross-bridges to bind to these active sites.

Q.4. What are  the differences between the pectoral and the pelvic girdle.

A.4. Both  structures are known to provide support to  lower and the upper parts of the body. Following are the differences:

Pectoral GirdlePelvic Girdle
1.It is known as shoulder girdle as it occurs in shoulder region.1.Pelvic girdle is also  called as the hip girdle as it occurs in the hip region.
2. Divided into two parts – One scapula and the other is the  clavicle.2. One of the pelvic girdle is formed by the  two innominate bones where each bone has  three different parts – ilium, pubis, and the ischium.
3. It is not articulated with  vertebral column.3. It is articulated with  vertebral column.
4. The articulation of axial skeleton and the upper limb is brought about by  clavicle and the  scapula.4. Innominate at its mid-lateral surface has the  deep cup-shaped acetabulum where  head of  femur connects the two parts of pelvic girdle for the formation of  pubic symphysis.
5. It’s associated bones are light and not subjected to more  stress.5. It’s associated bones are hard and subjected to more stress.
Functions  of pectoral girdle are-  lifting, holding, etc.Functions of pelvic girdle are -standing, running, jumping, etc.
Locomotion and Movement Class 11

Q.5.  State differences between the types of movements in an organism?

A.5. Movement  is a process of changing  position or  location in an organism.  The different organisms have the different  types of the movements-

Based on  modes of locomotion, movements are of three types:

  1. Amoeboid movement:  Here movement is the most common mode of the locomotion in all the  eukaryotic cells. It takes place in   phagocytes of a cell and is most commonly seen in case of amoeba.
  2. Ciliary or  flagellar movement: Here  movement occurs in   internal tubular organs which are lined by ciliary epithelium. Some of our internal tubular organs exhibit  ciliary movements.
  3. Muscular Movement: It  is a more complex movement which involves the muscle fibres, which have the ability to contract and to relax. This type of movements is seen in all different higher vertebrates.

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