CBSE Class 7 Science Transport and Excretion Assignment

I Name the following :

a) Selectively ‘open’ or porous membrane

b) A fluid tissue which has red blood cells, white blood cells and platelets.

c) Thinnest blood vessels

d) An instrument which helps to hear the sound of heart beat.

e) The artificial way of removing blood from the blood.

II Define the following

(a) Xylem (b) Phloem (c) Osmosis (d) Transpiration

(e) Plasma (f) Sweat gland (g) Dialysis.

III Fill in the blanks:

i) Things pass from a region of _____________ concentration to a region of _________ concentration.

ii) The red colour of blood is due to _____________________, a protein present in RBCs.

iii) The main function of ____________ cells is to defend the body against infections.

iv) The _____________ help in the clotting of blood.

v) ______________ carry blood from the heart to various parts of the body and _________ carry blood from rest of the body to the heart.

vi) The heart is divided into two upper chambers called _____________ and a lower chamber called ___________.

IV. Give reasons for the following:

i) Sweating helps to keep us cool.

ii) You can feel throbbing at the wrist and throat.

V. Choose the correct options from the following:

i) Food is carried from the leaves by pipes formed by

(a) Xylem (b) Phloem (c) Sap (d) Osmosis

ii) The contraction and relaxation of the heart is called

(a) Stethoscope (b) Heartbeat (c) Pulse (d) Blood pressure

iii) Filters of kidney are called

(a) Neuron (b) capillaries (c) nephron (d) funnel

VI. Draw well labelled neat diagrams of the following.

(a) Structure of heart (b) the Urinary System (c) Structure of nephron