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Bones are hard structures and cannot be bent. But, we can still bend our elbow, knee, etc. How is this possible?

The place where the two bones meet is known as the joint.A joint, also known as an articulation or articular surface, is a connection that... View Article

Boojho fell off a tree and hurt his ankle. On examination, the doctor confirmed that the ankle was fractured. How was it detected?

Doctor used X-ray technique to detect the injuries of Boojho. X-ray machines are used to examine the desired internal structure of body.They are... View Article

Given below is a list of different types of movements in animals. [Running, Jumping, Walking, Slithering, Crawling, Flying, Swimming, Creeping] Write the types of movements seen in each animal. (a) Duck (b) Horse (c) Kangaroo (d) Snail (e) Snake (f) Fish (g) Human beings (h) Cockroach

a) Duck swimming/walking b) Horse Running c) Kangaroo Jumping d) Snail Slithering e) Snake slithering f) Fish Swimming g)... View Article

Write the type of joint which is used for each of the following movements. (a) A cricket bowler bowls the ball. (b) A girl moves her head in right and left direction. (c) A person lifts weights to build up his biceps.

(a) Ball and Socket joint The ball and socket joint is a type of synovial joints in which one bone is hooked into the hollow space of another... View Article

Provide one-word answers to the statements given below. 1) A joint which allows movement in all directions. 2) A hard structure that forms the skeleton. 3) Part of the body with a fixed joint. 4) Help in the movement of the body by contraction and relaxation. 5) Bones that join with chest bone at one end and to the backbone at the other end. 6) A framework of bones which gives shape to our body. 7) Bones which enclose the organs of our body that lie below the abdomen. 8) Joint where our neck joins the head. 9) Part of the skeleton that forms the earlobe.

1. Ball and socket joint The ball and socket joint is a type of synovial joints in which one bone is hooked into the hollow space of another... View Article

What would have happened if our backbone was made of one single bone?

If our backbone was a single-bone structure then we would not have been able to bend and twist our back.The spine is made up of bones, muscles,... View Article

Name the type of joint of your hand which helps you to grasp a badminton racquet.

Hinge joint The hinge joint movement is across one axis that permits for flexion and extension. While flexion is for bending, the extension is... View Article

How many muscles work together to move a bone? (a) One (b) Two (c) Three (d) Four

b)Two Muscles work in pairs. Two muscles are used in the movement of a bone.Bones provide a definite shape to our body. Skeleton is the... View Article

A snail moves with the help of its (a) shell (b) bone (c) muscular foot (d) whole body.

c) Muscular foot The muscular foot of the snail comes outside and attaches to the ground during locomotion. The foot of a snail has a special... View Article

Underwater divers wear fin-like flippers on their feet to (a) swim easily in water (b) look like a fish (c) walk on the water surface

a) Swim easily in water. Swimfins help divers in swimming efficiently under the sea without using much force. Swimfins reduce muscle movement,... View Article

Which of the following organisms does not have both muscles and skeleton for movement? (a) Dog (b) Snail (c) Earthworm (d) Human being

None of these Dogs and human beings have both muscles and skeletons that coordinate together to bring about movement. The earthworm has... View Article

Which of the following joints is immovable? (a) Shoulder and arm (b) Knee and joint (c) Upper jaw and skull (d) The lower jaw and upper jaw

c) Upper jaw and skull The skull, as we know it, is made up of 22 bones (28 if auditory ossicles are included). But out of all these... View Article

Which of the following parts of our body help us in movement? (i) Bones (ii) Skin (iii) Muscles (iv) Organs choose the correct answer from the option below. (a) (i) and (iii) (b) (ii) and (iv) (c) (i) and (iv) (d) (ii) and (iii)

a) (i) and (iii) Bones and Muscles help our body in movement. Bones join together to form a structure called skeleton. Bones are hard and... View Article

Fill in the blanks with the terms that are listed below. (Anther, male, ovary, ovule, petals, pistil, stamen, filament) Sepals, (a) __, stamens and (b) are the parts of a flower. Stamen is made up of (c) and (d) and it represents the (e) part of the flower. The female part of the flower is called the (f) _. The basal, swollen part of the pistil is called the (g) which contains the (h) ___.

(a) Petals. This is a bright-coloured part that attracts bees, insects, and birds. Colour of petals varies from plant to plant; some are bright... View Article

Identify the wrong statements and correct them. (a) The anther is a part of the pistil. (b) The visible parts of a bud are the petals. (c) Lateral roots are present in a taproot. (d) Leaves perform the function of transpiration only.

(a) This statement is wrong. The anther is the part of a stamen that contains the pollen. The anther comprises sac-like structures known as... View Article

Observe the picture of an activity given as in the figure carried out with leaves of plants and polythene bag. Now answer the following: (a) Which process is demonstrated in the activity? (b) When will this activity show better results on a bright sunny day or a cloudy day? (c) What will you observe in the polythene bag after a few hours of setting up the activity? (d) Mention any one precaution you must take while performing this activity.

a) The process demonstrated in the activity is - Transpiration. b) The rate of transpiration depends on sunlight, more the sunlight, more is the... View Article

Observe the figure and attempt the questions that follow it. (a) Label the parts 1, 2, 3 and 4 in the diagram. (b) What type of venation does the leaf have? (c) What type of venation is seen in grass leaves?

Answer (a) Part 1 - Petiole Part 2 – Midrib Part 3 – Lamina Part 4 - Veins (b) The leaf has reticulate venation. In reticulate... View Article

Read the function of parts of a plant given below. (a) Fixes plant to the soil (b) Prepares starch (c) Takes part in reproduction (d) Supports branches and bears flowers In the diagram given in the figure, write the names of the parts whose functions you have just read at the appropriate space.

(a) Fixes plant to the soil - Root (b) Prepares starch - Leaf (c) Takes part in reproduction - Flower (d) Supports branches and bears flowers - Stem... View Article

Can the stem of a plant be compared with a street with two-way traffic? Give reason.

Yes, the stem of a plant can be compared with a street with two ways traffic because just like a two way street that allows traffic to travel in... View Article

Will a leaf taken from a potted plant kept in a dark room for a few days turn blue-black when tested for starch? Give reasons for your answer.

No, a leaf plucked from a potted plant kept in a dark room for a few days, will not turn blue-black when tested for starch. This is because,... View Article

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