CBSE Class 10 Biology Life Processes Worksheet Set A

MCQ Questions for NCERT Class 11 Biology Life Processes

Question. A pair of spongy organs lying in the chest cavity is called       
(a) hearts
(b) kidneys
(c) lungs
(d) bronchioles

Answer : C

Question. Which of the following structures increase the total surface area for the exchange of gases in the lungs?       
(a) Bronchi
(b) Alveoli
(c) Bronchioles
(d) Trachea

Answer : B

Question. Bile is produced by          
(a) pancreas
(b) liver
(c) small intestine
(d) stomach

Answer : B

Question. Which of the following represents the correct sequence of air passage during inhalation?       
(a) Nostrils→ larynx → pharynx → alveoli → lungs
(b) Nostrils → trachea → pharynx → larynx → lungs
(c) Nostrils → pharynx → larynx → trachea → alveoli
(d) Nostrils → alveoli → pharynx → larynx → lungs

Answer : C

Question. Balloon-like structures present inside the lungs are called       
(a) alveoli
(b) bronchioles
(c) bronchi
(d) alveolar ducts

Answer : A

Question. Haemoglobin, the respiratory pigment is not found in       
(a) WBC
(b) RBC
(c) platelets
(d) plasma

Answer : A

Question. A pacemaker is meant for 
(a) transporting liver.
(b) transplanting heart.
(c) initiation of heart beats.
(d) regulation of blood flow.

Answer : C

Question. Veins can be differentiated from arteries because the veins 
(a) have valves
(b) have hard walls.
(c) have pure blood in them.
(d) have thick walls.

Answer : A

Question. The rate at which oxygen moves from the alveoli of our lungs into our blood 
(a) depends on the difference in oxygen concentration between the alveoli and the blood.
(b) depends on the color of the alveoli.
(c) depends on the availability of energy to transport gases across the membrane.
(d) none of the above

Answer : A

Question. Heart beat can be initiated by 
(a) Sino-auricular node
(b) Atrio-ventricular node
(c) Sodium ion
(d) Purkinje’s fibres

Answer : A

Question. Erythropoesis may be stimulated by the deficiency of 
(a) Iron
(b) Oxygen
(c) Protein
(d) None of these

Answer : B

Question. The chief function of lymph nodes in mammalian body is to 
(a) produce RBCs
(b) collect and destroy pathogens
(c) produce a hormone
(d) destroy the old and worn out red blood cells

Answer : B

Question. Select the correct statement? 
(a) Heterotrophs do not synthesise their own food.
(b) Heterotrophs utilise solar energy for photosynthesis.
(c) Heterotrophs synthesise their own food.
(d) Heterotrophs are capable of converting carbon dioxide and water into carbohydrates.

Answer : A

Question. During deficiency of oxygen in tissues of human beings, pyruvic acid is converted into lactic acid in the 
(a) cytoplasm
(b) chloroplast
(c) mitochondria
(d) golgi body

Answer : A

Question. The phenomenon of normal breathing in a human being comprises. 
(a) an active inspiratory and a passive expiratory phase.
(b) a passive inspiratory and an active expiratory phase.
(c) both active inspiratory and expiratory phases.
(d) both passive inspiratory and expiratory phases.

Answer : A

Question. Filteration unit of kidney is 
(a) ureter
(b) urethra
(c) neuron
(d) nephron

Answer : D

Question. A column of water within xylem vessels of tall trees does not break under its weight because of: 
(a) Tensile strength of water
(b) Lignification of xylem vessels
(c) Positive root pressure
(d) Dissolved sugars in water

Answer : A

Question. Roots play insignificant role in absorption of water in: 
(a) Pistia
(b) Pea
(c) Wheat
(d) Sunflower

Answer : A

Question. Human urine is usually acidic because 
(a) excreted plasma proteins are acidic.
(b) potassium and sodium exchange generates acidity.
(c) hydrogen ions are actively secreted into the filtrate.
(d) the sodium transporter exchanges one hydrogen ion for each sodium ion in peritubular capillaries.

Answer : C

Question. Which one of the following animals has two separate circulatory pathways? 
(a) Lizard
(b) Whale
(c) Shark
(d) Frog

Answer : B

Question. Cow has a special stomach as compared to that of a lion in order to 
(a) absorb food in better manner.
(b) digest cellulose present in the food.
(c) assimilate food in a better way.
(d) absorb large amount of water.

Answer : B

Question. Which of the following is not an enzyme? 
(a) Lipase
(b) Amylase
(c) Trypsin
(d) Bilirubin

Answer : D

Fill in the blanks.

Question. The oxygen picked up by haemoglobin gets ...... with blood to various ...... .
Answer : transported, tissues

Question. Amoeba exhibits ...... nutrition.
Answer : holozoic

Question. Chlorophyll is mainly found in the ...... .
Answer : leaves

Question. ATP is the ...... for most cellular processes.
Answer : energy currency

Question. The walls of the alveoli contain an extensive network of ...... .
Answer : blood vessels

Question. The oral cavity opens into the ...... .
Answer : pharynx

Question. ...... is the first part of small intestine.
Answer : Duodenum

Mark the statements True (T) or False (F).

Question. Anaerobic reactions after glycolysis produce lactic acid, or ethanol.
Answer : true 

Question. As compared to aerobic respiration, anaerobic respiration produces more energy.
Answer : false

Question. Stomach serves as a storehouse of food where complete digestion takes place.
Answer : false

Question. Gastric glands are present in small intestine.
Answer : false

Assertion Reason Type Questions

Following questions consists of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
A. Both assertion and reason are true, and reason is the correct explanation of assertion.
B. Both assertion and reason are true, but reason is not the correct explanation of assertion.
C. Assertion is true but reason is false.
D. Assertion is false and reason is true.

Question. Assertion: Kidneys perform a dual function in our body.
Reason: Selective reabsorption occurs in the glomerulus.
Answer : C

Question. Assertion: Tracheal cartilage is present in the throat.
Reason: The larynx plays an important role in human speech.
Answer : B

Question. Assertion: Veins have valves.
Reason: The pressure for the flow is far lesser compared to arteries.
Answer : A

21) Assertion: The opening and closing of the pore is a function of the guard cells.
Reason: Stomatal pores are the site for exchange of gases by diffusion.
Answer : B

Question. Assertion: Respiration is opposite of Photosynthesis.
Reason: In Photosynthesis food is made from energy and in Respiration food is converted to energy.
Answer : A

Question. Assertion: Kidneys purify blood.
Reason: Renal vein has more Oxygen than renal artery.
Answer : C

Question. Assertion: In plants gaseous exchange takes place by the opening and closing of guard cells.
Reason: The exchange of gases occurs across the surface of stem, roots and leaves.
Answer : B

Cct Questions:

1. Our body needs to remove the wastes that build up from cell activities and from digestion. If these wastes are not removed, then our cells can stop working and we can get very sick. The organs of excretory system consist of a pair of kidneys, a pair of ureters, a urinary bladder and a urethra. Each kidney is made up of nearly one million complex tubular structures called nephrons. The formation of urine involves various processes that take place in the different parts of the nephrons. Each nephron consists of a cup- shaped upper end called Bowman’s capsule containing a bunch of capillaries called glomerulus. Bowman’s capsule leads to tubular structure, proximal convoluted tubule, loop of Henle and distal convoluted tubule which ultimately join the collecting tubule.

Question. The following substances are the excretory products in animals. Choose the least toxic form.
A. Urea
B. Uric acid
C. Ammonia
D. All of these
Answer : A

Question. Glomerular filtrate is first collected by
A. Distal convoluted tubule
B. proximal convoluted tubule
C. Bowman’s capsule space
D. loop of Henle
Answer : C

Question. The outline of principal events of urination is given below in random order.
I) stretch receptors on the wall of urinary bladder send signals to the CNS.
II) The bladder fills with urine and become distended.
III) Micturition (voiding out urine)
IV) CNS passes on motor messages to initiate the contraction of smooth muscles of bladder and simultaneous relaxation of urethral sphincter.
The correct sequence of the events is
A. I → II → III→ IV
B. IV → III → II→ I
C. II → I→ IV → III
D. III → II→ I→ IV
Answer : C

Question. Urine formation occurs through
A. Ultrafiltration, reabsorption, secretion.
B. Secretion, osmosis, ultrafiltration and reabsorption.
C. Only filtration and absorption.
D. Only osmosis and secretion.
Answer : A

Important Questions for NCERT Class 10 Science Life Processes

Very-Short-Answer Questions

Question. Name the respiratory pigments of human beings.
Answer : Haemoglobin

Question. In which form is food stored in plants and in animals?
Answer : Starch in plants and glycogen in animals

Question. Why are heterotrophs called consumers?
Answer : They obtain food from other sources.

Question. Name the watery substance released in our mouth during eating.
Answer : Saliva

Question. What does saliva contain?
Answer : Mucin and salivary amylase

Question. Name the structure which prevents food from entering the passage to the lungs.
Answer : Epiglottis