CBSE Class 7 Science Transport And Excretion Worksheet

Question. Loops of Henle occurs in
(A) Cortex
(B) Medulla
(C) Pelvis
(D) Ureter
Answer: B

Question. In cockroach, the excretory product is
(A) Ammonia
(B) Uric acid
(C) Urea
(D) Both (A) and (C)
Answer: B

Question. Bile pigments are formed in
(A) Liver
(B) Spleen
(C) Every body cells
(D) 1 & 2 both
Answer: D

Question. What will happen if one kidney is removed from the body of a human being
(A) Death due to poisoning
(B) Uremia and death
(C) Stoppage of urination
(D) Nothing, the person will survive and remain normal kidney will become hypertrophied
Answer: D

Question. Excretory material are formed in
(A) Kidney
(B) Rectum
(C) Liver
(D) Every cell in body
Answer: D

Question. Diameter of the renal afferent vessel is
(A) Same as that of efferent
(B) Smaller than that of efferent
(C) Larger than that of efferent
(D) There is no efferent vessel
Answer: C

Question. Nitrogenous waste products are eliminated mainly as -
(A) Urea in tadpole & ammonia in adult frog
(B) Ammonia in tadpole and urea in adult frog
(C) Urea in both tadpole & adult frog.
(D) Urea in tadpole and uric acid in adult frog.
Answer: B

Question. "Homeostasis" term was proposed by
(A) Claude Bernard
(B) Walter cannon
(C) Marcello Malpighi
(D) Henle
Answer: B

Question. Reabsorption of useful substances from glomerular filtrate occurs in
(A) Collecting tube
(B) Loop of Henle
(C) Proximal convoluted tubule
(D) Distal convoluted tubule
Answer: C

Question. The mechanism of urine formation in nephron involves
(A) Ultrafiltration
(B) Reproduction
(C) Diffusion
(D) Osmosis
Answer: A

Question. In mammals the urinary bladder opens into
(A) Uterus
(B) Urethra
(C) Vestibule
(D) Ureter
Answer: B

Question. Which one is uricotelic
(A) Frog and toads
(B) Lizards and birds
(C) Cattle, money and man
(D) Molluscs and teleost fishes
Answer: B

Question. Excretion is
(A) Removal of substances not required by body
(B) Removal of useless substances and susbtances present in excess
(C) Formation of substances having some role in body
(D) All the above
Answer: B

Question. Malpighian corpuscles occur in
(A) Medulla
(B) Cortex
(C) Pelvis
(D) Pyramid
Answer: B

Question. Which blood vessel contains the least amount of urea
(A) Hepatic vein
(B) Renal vein
(C) Hepatic portal vein
(D) Renal artery
Answer: B

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