Getting to know plants (Part-6)

       Getting to know plants 

Q.17. What are the functions of root?

Ans. The functions of root are:

•   The roots help in holding the plant firmly in the soil. They are said to anchor the plant to the soil.

•    Absorption of water and minerals from the soil.

•    Help to bind soil particles together.

•   Sometimes roots are modified to perform additional functions like reproduction, nutrition etc.

 Q.18. What are tap roots? Draw a sketch of tap roots.

Ans. Characteristics of tap roots:

•     In the tap root system, a single straight tapering root (called the primary root) grows vertically down into the soil and give out branches on all sides. Tap roots are also called true roots.

•      Later smaller roots called lateral roots branch out from this primary root.

•      Mango, neem, pine, sheesham, pea, carrot, radish, turnip, and beetroot plants have taproot.

      

Q.19. What are fibrous roots? Draw a sketch of fibrous roots.

Ans. Characteristics of fibrous roots:

·      The fibrous roots consist of many thin, fibre-like roots of a similar size.

·    These roots are thin and almost equal in size. They spread out in the soil and give a firm support to the plant.

·      Grass, maize, wheat, onion, sugarcane and rice have fibrous roots.

Q.20. If a plant has fibrous root, what type of venation are its leaves likely to have?

Ans. Parallel venation

Q.21. If a plant has leaves with reticulate venation, what kind of roots will it have?

Ans. Tap root

Popular posts from this blog

Friction (part-1)

Image
FRICTION Q.1. What is force? Write few of its characteristics. Ans.1.  A push or a pull on an object is called a force.                      Force is a vector quantity (having magnitude  as well as direction).           S.I. unit of Force is N (Newton).           Force can Change the State of Motion.                   Force can Change the Shape of an Object. s          Q.2. What is friction ?      Ans.2.  The force which opposes the motion of an object on the surface of another object is called force of friction. Force of friction is a contact force. The force of friction always opposes the applied force (direction of motion).  
Read more

Friction (part-2)

Image
FRICTION Q.3.  Suppose your writing desk is tilted a little. A book kept on it starts sliding down. Show the direction of frictional force acting on it. Ans.3.                                 Q.4. What is the cause of friction? Ans.4.  Friction occurs due to the interlocking of irregularities between two surfaces in motion to each other. Every object has some sort of irregularities in its surface, so when two surfaces come in contact with each other and one object moves over the another, so their irregularities get interlocked and moving object starts losing its energy in breaking the interlocking and finally it comes to rest.                                             Q.5. What are the factors on which friction depends? Ans.5.  There are two factors affecting friction: 1.      Nature of the surfaces: Friction increases with roughness and decreases with smoothness of the surfaces. On rough surfaces, there are a larger number of irregularities than the s
Read more
PRACTICE WORKSHEET (CLASS - VIII) TOPIC – FORCE AND PRESSURE 1. When a force acts on a moving object, it can make the object a) move faster b) slow down c) stop d) all of these 2. Name the type of forces involved in the following :  a) A horse pulling a cart _________________________  b) A moving boat coming to rest when rowing is stopped ___________________ c) A coin falling to the ground on slipping from hand ______________________  d) A sticker attached to steel almirah without glue _________________________ 3. Two students fought over a lunch box, both started pulling it from opposite ends but the box didn't move from its place. What will you infer about the magnitude and direction of the forces? 4. An archer shoots an arrow in the air horizontally. However, after moving some distance, the arrow falls to the ground. Name the initial force that sets the arrow in motion. Explain why the arrow ultimately falls down. Assertion / Reason :  For question numbers 5, two sta
Read more