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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

Boojho wanted to test the presence of starch in leaves. He performed the following steps. (1) He took a leaf and boiled it in water. (2) He placed the leaf in a petri dish and poured some iodine over it. He did not get the expected result. Which step did he miss? Explain.

Boojho didn’t get the result as he boiled the leaf in water instead of alcohol. Alcohol removes green colour (chlorophyll) from the leaf.... View Article

Solve the riddles given below. (a) “I have a green tender stem and I am much shorter than you. Who am I?” (b) I come out first from the seed when it is soaked in water. I provide anchorage to plants. Who am I? Write another function that I perform.

(a) Herb or name of any small plant. (b) Root; absorption of water and minerals. The herb is a short-sized plant with soft, green, delicate... View Article

Fill in the blanks. (a) The small green leaves at the base of flowers are known as ___. (b) The swollen basal part of the pistil is the which bears the . (c) Stamen has two parts called_ and . (d) The young unopened flower is termed as____.

(a) The small green leaves at the base of the flower are known as sepals. The sepals protect the flower when it is in the form of a bud in the... View Article

Which of the following terms constitute the female part of the flower? (a) Sepals, petal and stamen (b) Stigma, style and ovary (c) Ovary, stamen and stigma (d) Ovary, style and stamen

b) Stigma, style and ovary The stigma receives the pollen grain, the pollen tube passes through the style and the ovary is where seeds are... View Article

Read the following sentences about photosynthesis. (i) Sunlight, carbon dioxide, chlorophyll and water are necessary. (ii) Oxygen is absorbed. (iii) Leaves carry out photosynthesis. (iv) Proteins are made during photosynthesis. Choose the correct pair of sentences that are true to photosynthesis. (a) (iii) and (iv) (b) (i) and (iii) (c) (ii) and (iv) (d) (i) and (iv)

Statement (i) and (iii) are correct. The leaves make food for the plant by the process of photosynthesis. In photosynthesis, the green leaves... View Article

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