Biology Class 11 NCERT Solutions: Chapter 20 Locomotion and Movement Part 3 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Q: 9. Name the type of joint between the following:-

(A) atlas/axis

(B) carpal/metacarpal of thumb

(C) Between phalanges

(D) Femur/acetabulum

(E) Between cranial bones

(F) Between pubic bones in the pelvic girdle

Answer:

(A) atlas/axis: Pivotal joint

(B) Carpal/metacarpal of thumb: Saddle joint

(C) Between phalanges: Hinge joint

(D) Femur/acetabulum: Ball and socket joint

(E) Between cranial bones: Fibrous joint

(F) Between pubic bones in the pelvic girdle: Ball and socket joint

Q: 10. Fill in the blank spaces:

(A) All mammals (except a few) have ________ cervical vertebra.

(B) The number of phalanges in each limb of human is ________

(C) Thin filament of myofibril contains 2 F actions and two other proteins namely ________ and ________.

(D) In a muscle fibre is stored in ________

(E) ________ and ________ pairs of ribs are called floating ribs.

(F) The human cranium is made of ________ bones.

Answer:

(A) All mammals (except a few) have seven cervical vertebra.

(B) The number of phalanges in each limb of a human is 14.

(C) Thin filament of myofibril contains 2 ‘F’ actions and two other proteins, namely troponin and tropomyosin.

(D) In a muscle fiber, is stored in the sarcoplasmic reticulum.

(E) 11th And 12th pairs of ribs are called floating ribs.

(F) The human cranium is made up of eight bones

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