CBSE Class 10 Biology Life Processes MCQs Set G

Question. Which of the following parts of a kidney contains the lowest concentration of urea ?
(a) Lop of Henle
(b) Branches of renal vein
(c) Bowman’s capsule
(d) Glomerulus

Answer: B

Question. Uriniferous tubules of a kidney are concerned with formation of
(a) glucose
(b) amino acids
(c) hormones
(d) urine

Answer: D

Question. Ammonia is converted into urea in
(a) kidney
(b) spleen
(c) liver
(d) nephron

Answer: C

Question. Function of loop of Henle is
(a) conservation of water
(b) formation of urine
(c) filtration of blood
(d) passage of urine

Answer: A

Question. Urea is transported through
(a) RBCs
(b) WBCs
(c) Plasma
(d) All of the options

Answer: C

Question. Major function of contractive vacuole is
(a) excretion
(b) circulation
(c) osmoregulation
(d) all tof the options

Answer: C

Question. Which one is a accessory excretory organ
(a) Liver
(b) Stomach
(c) Intestine
(d) Heart 

Answer: A

Question. Excretion is removal of
(a) CO₂
(b) harmful and useless ingredients
(c) extra water
(d) metabolic wastes

Answer: D

Question. Which of the following is used in measuring transpiration ?
(a) Photometer
(b) Cobalt chloride paper
(c) Bell – jar
(d) None of the options

Answer: A

Question. Translocation of solutes primarily takes place through
(a) phloem
(b) xylem
(c) cortex
(d) pith.

Answer: A

Question. Muscle cells engaged in vigorous activity build up a high concentration of
(a) lactic acid
(b) pyruvic acid
(c) alcohol
(d) cholesterol

Answer: A

Question. Main function of kidney is
(a) passive absorption
(b) ultrafiltration
(c) selective reabsorption
(d) Both B and C

Answer: D

Question. The process of respiration is concerned with
(a) liberation of oxygen
(b) liberation of carbon dioxide
(c) liberation of energy
(d) intake of oxygen

Answer: C

Question. The common immediate source of energy for cellular activity is
(a) NAD
(b) ATP
(c) DNA
(d) RNA

Answer: B

Question. Breathing rate in mammals in controlled by a part of the brain called the
(a) thalamus
(b) hypothalamus
(c) medulla oblongata
(d) cerebellum

Answer: C

Question. In anaerobic respiration
(a) O₂ is taken in
(b) CO₂ is taken in
(c) O₂ is given out
(d) CO₂ is given out

Answer: D

Question. Disease called pleurisy is due to
(a) inflammation of pleura
(b) inflammation of trachea
(c) inflammation of alveoli
(d) none of the options

Answer: A

Question. Leaves respire with the help of
(a) lenticles
(b) stomata
(c) plasmodesmata
(d) cuticle

Answer: B

Question. The tissue respiration refers to
(a) inspiration
(b) external respiration
(c) internal respiration
(d) expiration

Answer: C

Question. If the CO₂ concentration in the blood increases, the rate of breathing will
(a) decrease
(b) stop
(c) increase
(d) have no effect

Answer: C

Question. Vocal cards occur in
(a) pharynx
(b) glottis
(c) bronchial tube
(d) larynx

Answer: D

Question. Which of the following gases makes the most stable combination with the hemoglobin of red blood cells.
(a) CO₂
(b) CO
(c) O₂
(d) N₂

Answer: B

Question. Volume of air inspired or expired with each normal breath is called
(a) tidal volume
(b) inspiratory capacity
(c) total lung capacity
(d) residual volume

Answer: A

Question. Most of the carbon dioxide in the blood is carried in the form of
(a) carbonic acid
(b) bicarbonates
(c) carbaminohaemoglobin
(d) dissolved CO₂

Answer: B

Question. Correct statement is
(a) roots of plant respire through lenticles and stomata.
(b) stem of plant respire through lenticles
(c) both A and B are correct
(d) both A and B are incorrect

Answer: B

Question. Which of the following is not a characteristic of good respiratory surface ?
(a) Thin and moist
(b) Large surface area
(c) Close to oxygen and gas transport
(d) Thick and dry surface

Answer: D

Question. Respiration in yeast
(a) takes place in the presence of oxygen
(b) yields lactic acid and carbon dioxide
(c) in anaerobic and produces carbon dioxide
(d) takes place only in darkness

Answer: C

Question. In man, which of the following structures is analogous to the spiracles of cockroach ?
(a) Alveoli
(b) Lungs
(c) Bronchioles
(d) Nostrils

Answer: D

Question. Which of the following prevents collapsing of trachea ?
(a) Diaphragm
(b) Ribs
(c) Cartilaginous ring
(d) Muscles

Answer: C

Assertion and Reason Type Questions
Directions: In the following questions, a statement of assertion(A) is followed by a statement of reason(R). Mark the correct choice as:
(a) Both assertion (A) and reason(R)are true and reason(R)is the correct explanation of assertion(A)
(b) Both assertion (A) and reason(R) are true but reason (R) is not the correct explanation of assertion (A)
(c) Assertion (A) is true but reason(R) is false
(d) Assertion (A) is false but reason (R)is true

Question. Assertion (A): The excretory unit of kidney is nephron.
Reason(R): It carries out filtration, selective absorption and tubular secretion to form urine in kidney.

Answer: A

Question. Assertion (A): The oxygenated and deoxygenated blood is separate in the heart of mammals.
Reason(R): This allows efficient supply of oxygen to all tissues.

Answer: A

Question: Assertion : During transpiration the evaporating water carries away heat energy.
Reason : Due to water loss the osmotic pressure inside leaves increases.

Answer: C

Question: Assertion: Herbivores have longer intestine to allow the cellulose to get digested.
Reason : Carnivores have shorter intestine to allow meat to get digested.

Answer: B

Question. Assertion (A): Herbivores have larger small intestine as compared to carnivores.
Reason(R): Complete digestion of food takes places in small intestine.

Answer: B

Question: Assertion : a mammal has double circulation .
Reason : higher energy need due to endothermy.

Answer: A

Question: Assertion: veins have valves.
Reason : the pressure for the flow is far lesser compared to arteries.

Answer: A

Question: Assertion : kidneys purify blood.
Reason : renal vein has more Oxygen than renal artery.

Answer: C

Case Study Based Questions

I.

Question. Which of these correctly represent the labels B C D and E
A. Pancreas , Oesophagus , Stomach , Liver
B. Oesophagus , Liver , Stomach , Pancreas
C. Stomach , Liver , Oesophagus , Pancreas
D. Oesophagus , Pancreas , Liver , Stomach

Answer: B

Question. Villi are present in
A. D
B. E
C. F
D. A

Answer: C

Question. The enzyme that is released by label A
A. Tripsin
B. Amino acids
C. Amylase
D. Intestinal juices

Answer: C

Question. The movements that occur along part B to push the food forward.
A. Rotation
B. Peristalsis
C. Flexion
D. Protrusion

Answer: B

Question. In case of diarrhoea, which major process does not takes place normally in region G?
A. Absorption of food
B. Absorption of water
C. Secretion of hormones
D. Removal of waste material

Answer: B

II.

Question. The pathway of respiration common in all living organisms is X ; it occurs in the Y and the products formed are two molecules of Z . Identify X Y Z and select the correct answer.
           X                                  Y                             Z
A. Glycolysis                   Mitochondria           Pyruvic acid
B. Glycolysis                   Cytoplasm               Pyruvic acid
C. Citric acid cycle          Cytoplasm               Phosphate
D. Kreb’s cycle                Mitochondria           Acetyl CoA

Answer: B

Question. During vigorous physical exercise, lactic acid is formed from glucose inside the muscle cells because
A. there is lack of oxygen
B. there is lack of water
C. there is excess of carbon dioxide
D. none of the options

Answer: A

Question. Type of respiration seen during fermentation
A. Aerobic
B. Anaerobic
C. Reduction
D. Oxidation

Answer: B

Question. End product of Aerobic respiration
A. NADH
B, Oxygen
C. ATP
D. CO₂ + ATP + H₂O

Answer: D

Question. Amount of energy released is more during
A. Anaerobic respiration
B. Fermentation
C. Aerobic respiration
D. Reduction

Answer: C

III. Blood transport food, Oxygen and waste materials in our bodies. It consists of plasma as a fluid medium. A pumping organ [heart]is required to push the blood around the body.The blood flow through the chambers of heart in a specific manner and direction .While flowing throughout the body, blood exert a pressure against the wall or a vessel.

Question. Oxygenated blood from lungs enters left atrium through
A. vena cava
B. pulmonary artery
C. pulmonary vein
D. Aorta

Answer: C

Question. The rate of blood flow in the capillaries is very low because capillaries are
A. very narrow and have high resistance
B. Much wide and have low resistance
C. Very narrow and have low resistance
D. Much wide and have high resistance

Answer: A

Question. Which of the following statements are true about human heart ?
A. It is a hollow muscular organ
B. It is four chambered having three auricles and one ventricle.
C. It has different chambers to prevent Oxygen rich blood from mixing with the blood containing Carbondioxide
D. BOTH A & C

Answer: D

Question. Study the table below and select the row that has correct information .
    BODY FLUID                     CONTENTS
A. Blood                      plasma + RBC + WBC + platelets
B. Plasma                   Blood -- RBC
C. Lymph                    Plasma + RBC
D. Serum                    Plasma + RBC + WBC

Answer: A

IV. 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 consists 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 takes 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 joins 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. Carbondioxide

Answer: B

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

Answer: C

Question. The out line 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
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 and osmosis.
B. secretion,osmosis,ultrafiltration and reabsorption.
C. only filtration and absorption .
D. only osmosis and secretion.

Answer: A