NCERT Solutions for class 7 Science Chapter-11

Posted onAuthorChaman

NCERT Solutions for class 7 Science Chapter-11

Chapter – 11

Transportation in Animals and Plants

Chapter Exercise

Page no. – (131)

 

Q.1– Match structure given in column I with functions given in column II.

       Column I      Column II
i.     Stomata a.     Absorption of water
ii.    Xylem b.      Transpiration
iii.   Root hairs c.      Transport of food
iv.   Root hairs d.      Transport of water
  e.      Synthesis of carbohydrate

 

Ans.1–

       Column I      Column II
i.     Stomata b.      Transpiration
ii.    Xylem d.      Transport of water
iii.   Root hairs a.      Absorption of water
iv.   Phloem   c.       Transport of food

 

 

Q.2– Fill in the blanks.

  1. The blood from the heart is transported to all parts of the body by the ____.
  2. Haemoglobin is present in ____ cells.
  • Arteries and veins are joined by a network of ____.
  1. The rhythmic expansion and contraction of the heart is called ____.
  2. The main excretory product in human beings is ____.
  3. Sweat contains water and ____.
  • Kidney eliminate the waste materials in the liquid form called ____.
  • Water reaches great heights in the trees because of suction pull caused by _____.

 

Ans.2–

  1. The blood from the heart is transported to all parts of the body by the __arteries__.
  2. Haemoglobin is present in __red blood__ cells.
  • Arteries and veins are joined by a network of __capillaries
  1. The rhythmic expansion and contraction of the heart is called __heart beat
  2. The main excretory product in human beings is __urea
  3. Sweat contains water and __salts
  • Kidney eliminate the waste materials in the liquid form called __urine
  • Water reaches great heights in the trees because of suction pull caused by __transpiration

 

 

Q.3– Choose the correct option:-

  1. In plants, water is transport through
  2. Xylem
  3. Phloem
  • Stomata
  1. Root hair

Ans. a)– i. Xylem

 

  1. Water absorption through roots can be increased by keeping the plants:-
  2. In the shade
  3. In dim light
  • Under the fan
  1. Covered with polythene bag

Ans. b)– iii. Under the fan.

 

Q.4– Why is transport of materials necessary in a plant or in an animal? Explain.

 

Ans.4– The transport of materials necessary in a plant or in an animal because:-

  • To transport oxygen and nutrients in the whole body.
  • Animals need to transport wastes to parts from where they can be removed.

 

 

Q.5– What will happen if there are no platelets in the blood?

 

Ans.5– The Platelets are responsible for clotting of blood. if we not have platelets, the blood would not clot after injury and this will make death after losing the blood.

 

Q.6– What are stomata? Give two functions of stomata.

 

Ans.6– The Stomata are numerous pores or opening on the surface of a leaf.

Functions of Stomata are:-

  • It helps in transportation of water.
  • Exchange of gases takes place.
  • Evaporation of water through the leaves occurs due to stomata.

 

 

Q.7– Does transpiration serve any useful function in plants? Explain.

 

Ans.7– The transpiration serves useful function in plants are:-

  • It causes loss of water absorbed by plants.
  • It helps in getting rid of the excess of water.

 

Q.8– What are the components of blood?

 

Ans.8– White blood cells, red blood cells, platelet and plasma are the component of blood.

 

Q.9– Why is blood needed by all the parts of a body?

 

Ans.9– The blood needed by all the parts of a body because:-

  • Blood is a connective tissue in whole body.
  • For provide essential energy.
  • For transfer of oxygen to all parts of our body.

 

Q.10– What makes the blood look red?

 

Ans.10– A red pigment called Haemoglobin makes the blood looks red.

 

Q.11– Describe the function of the heart.

 

Ans.11– The heart is a blood pumping and purifier organ. The right ventricle and auricle receive blood with Co2 from all parts of the body. For purifying the blood, heart pump the blood to lungs. In the lungs, the process of exchange of gases takes place. After that, purified blood back to left auricle and it pumps to left ventricle. Now purified blood transferred to all parts of the body.

 

 

Q.12– Why is it necessary to excrete waste products?

 

Ans.12– It is necessary to excrete waste products because these are toxic and harm our body also may lead damning disease.

 

Q.13– Draw a diagram of the human excretory system and label the various parts.

 

Ans.13–

  Fig. 11.7    Human Excretory System.

NCERT Solutions  for Class 7 Maths Exercise – 15.1