6. Life Processes

SEBA Class 10 Science Chapter 6 Life Processes

Chapter 6 Life Processes

Class 10 Science Chapter 6 Life Processes Multiple Choice Questions and Answers :

Question : The kidneys in human beings are a part of the system for

(a) nutrition.

(b) respiration.

(d) transportation.

Answer : (c) excretion.

Question : The xylem in plants are responsible for

(a) transport of water.

(b) transport of food.

(d) transport of oxygen.

Answer : (a) transport of water.

Question : The autotrophic mode of nutrition requires

(a) carbon dioxide and water.

(b) chlorophyll.

(d) all of the above.

Answer : (d) all of the above.

Question : The breakdown of pyruvate to give carbon dioxide, water and energy takes place in

(a) cytoplasm.

(b) mitochondria.

(d) nucleus.

Answer : (b) mitochondria.

Question : Emulsification of fat molecule is carried out by : [SEBA 2015]

(a) Trypsin

(b) Pepsin

(d) Amylase

Answer : (c) Bile salts

[The emulsification of fat molecules is carried out by bile salts. ]

Question : Anaerobic respiration occurs in – [SEBA 2016]

(a) Mitochondria (b) Chloroplast (c) Nuclcus (d) Cytoplasm

Answer : (d) Cytoplasm

[Anaerobic respiration occurs in the cytoplasm. ]

Question: The enzyme which converts starch to simple sugar is [SEBA 2017]

(a) Amylase (b) lipase (c) pepsin (d) trypsin

Answer : (a) Amylase .

[The enzyme that converts starch to simple sugars is amylase. ]

Question : The name of the process with the help of which carbon and energy requirements of an autotrophic organism are fulfilled ,is : [SEBA 2018]

(a) Photosynthesis (b) transpiration (c) translocation (d) Photophosphorylation

Answer : (a) Photosynthesis.

[The process with the help of which carbon and energy requirements of an autotrophic organism are fulfilled is photosynthesis. During photosynthesis, autotrophic organisms, such as plants, use sunlight to convert carbon dioxide and water into glucose and oxygen.]

Question : The enzyme contained by our saliva is called [SEBA 2019]

(a) amylase (b) lipase (c) trypsin (d) pepsin

Answer : (a) Amylase.

[The enzyme contained in our saliva is called amylase. Amylase is an enzyme that plays a crucial role in the digestion of carbohydrates, breaking down starch into simpler sugars such as maltose. Salivary amylase is produced by the salivary glands and begins the digestion of starch in the mouth. ]

Question : Anaerobic respiration takes place in – [SEBA 2020]

(a) Mitochondria

(b) Chloroplast

(d) Cytoplasm

Answer : (d) Cytoplasm

[Anaerobic respiration takes place in the cytoplasm. Anaerobic respiration is the process by which cells generate energy without the use of oxygen.]

Question : Sphygmomanometer is an instrument which is used to measure the of a man .[SEBA 2021]

(a) blood pressure

(b) level in the blood

(d) level of urea in the blood

Answer : (a) blood pressure

Question : Breakdown of glucose into pyruvate takes place in the [SEBA 2023]

(a) Cell cytoplasm (b) Mitochondria (c) Cell membrane (d) Golgi body

Answer : (a) Cell cytoplasm.

[The breakdown of glucose into pyruvate takes place in the cell cytoplasm.]

Question : The energy currency for most of the cellular processes is : [SEBA 2023]

(a) ADP (b) AMP (c) ATP (d) CO2

Answer : (c) ATP

[The energy currency for most cellular processes is ATP (adenosine triphosphate).]

Question : The process by which some organisms fulfil their carbon and energy requirements and yields their stored form of energy is . [2023]

Answer : photosynthesis .

[ The process by which some organisms fulfill their carbon and energy requirements and yield their stored form of energy is photosynthesis. During photosynthesis, autotrophic organisms, such as plants, use sunlight to convert carbon dioxide and water into glucose and oxygen. The stored form of energy is in the chemical bonds of glucose.]

Question : Which of the following statements about the autotrophs is incorrect?

(a) They synthesise carbohydrates from carbon dioxide and water in the presence of sunlight and chlorophyll

(b) They store carbohydrates in the form of starch

(d) They constitute the first trophic level in food chains

Answer : (c) They convert carbon dioxide and water into carbohydrates in the absence of sunlight .

Question : In which of the following groups of organisms, food material is broken down outside the body and absorbed?

(a) Mushroom, green plants, Amoeba

(b) Yeast, mushroom, bread mould

(d) Cuscuta, lice, tapeworm

Answer : (b) Yeast, mushroom, bread mould

Question : Select the correct statement

(a) Heterotrophs do not synthesise their own food

(b) Heterotrophs utilise solar energy for photosynthesis

(d) Heterotrophs are capable of converting carbon dioxide and water into carbohydrates

Answer : (a) Heterotrophs do not synthesise their own food

Question : Which is the correct sequence of parts in human alimentary canal?

(a) Mouth → stomach → small intestine → oesophagus → large intestine

(b) Mouth →oesophagus → stomach → large intestine → small intestine

(d) Mouth → oesophagus → stomach → small intestine→ large intestine

Answer : (d) Mouth → esophagus → stomach → small intestine → large intestine

Question : If salivary amylase is lacking in the saliva, which of the following events in the mouth cavity will be affected?

(a) Proteins breaking down into amino acids

(b) Starch breaking down into sugars

(d) Absorption of vitamins

Answer : (b) Starch breaking down into sugars

Question : The inner lining of stomach is protected by one of the following from hydrochloric acid. Choose the correct one

(a) Pepsin

(b) Mucus

(d) Bile

Answer : (b) Mucus

[ Mucus serves as a protective layer on the inner lining of the stomach, preventing it from being damaged by the acidic gastric juices, including hydrochloric acid. ]

Question : Which part of alimentary canal receives bile from the liver?

(a) Stomach

(b) Small intestine

(d) Oesophagus

Answer : (b) Small intestine

Question : A few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains

(a) complex proteins

(b) simple proteins

(d) starch

Answer : (d) Starch

Question : In which part of the alimentary canal food is finally digested?

(a) Stomach

(b) Mouth cavity

(d) Small intestine

Answer : (d) Small intestine

Question : Choose the function of the pancreatic juice from the following

(a) trypsin digests proteins and lipase carbohydrates

(b) trypsin digests emulsified fats and lipase proteins

(d) trypsin digests proteins and lipase emulsified fats

Answer : (d) Trypsin digests proteins, and lipase digests emulsified fats.

Question : When air is blown from mouth into a test-tube containing lime water, the lime water turned milky due to the presence of

(a) oxygen

(b) carbon dioxide

(d) water vapour

Answer : (b) Carbon dioxide

[ Carbon dioxide reacts with lime water to form calcium carbonate, which is insoluble and gives the milky appearance.]

Question : The correct sequence of anaerobic reactions in yeast is

(a) Glucose Pyruvate Ethanol + Carbondioxide

(b) Glucose Pyruvate Lactic acid

(d) Glucose Pyruvate Ethanol + Carbondioxide

Answer : (d) Glucose Pyruvate Ethanol + Carbondioxide

Question : Which of the following is most appropriate for aerobic respiration?

(a) Glucose Pyruvate + Energy

(b) Glucose Pyruvate + Energy

(d) Glucose Pyruvate + Energy + Energy

Answer : (b) Glucose Pyruvate + Energy

Question : Which of the following statement(s) is (are) true about respiration?

(i) During inhalation, ribs move inward and diaphragm is raised

(ii) In the alveoli, exchange of gases takes place i.e., oxygen from alveolar air diffuses into blood and carbon dioxide from blood into alveolar air

(iii) Haemoglobin has greater affinity for carbon dioxide than oxygen

(iv) Alveoli increase surface area for exchange of gases

(a) (i) and (iv) (b) (ii) and (iii)

Answer : (d) (ii) and (iv).

Question : Which is the correct sequence of air passage during inhalation?

(a) Nostrils → larynx → pharynx → trachea → lungs

(b) Nasal passage → trachea → pharynx → larynx → alveoli

(d) Nostrils → pharynx → larynx → trachea → alveoli

Answer : (d) Nostrils → pharynx → larynx → trachea → alveoli

Question : During respiration exchange of gases take place in

(a) trachea and larynx

(b) alveoli of lungs

(d) throat and larynx

Answer : (b) Alveoli of lungs

Question : Which of the following statement (s) is (are) true about heart?

(i) Left atrium receives oxygenated blood from different parts of body while right atrium receives deoxygenated blood from lungs

(ii) Left ventricle pumps oxygenated blood to different body parts while right ventricle pumps deoxygenated blood to lungs

(iii) Left atrium transfers oxygenated blood to right ventricle which sends it to different body parts

(iv) Right atrium receives deoxygenated blood from different parts of the body while left ventricle pumps oxygenated blood to different parts of the body

(a) (i) (b) (ii)

Answer : (c) (ii) and (iv)

Question : What prevents backflow of blood inside the heart during contraction?

(a) Valves in heart

(b) Thick muscular walls of ventricles

(d) All of the above

Answer : (a) Valves in the heart

[ Valves in the heart, specifically the atrioventricular (AV) valves and semilunar valves, prevent the backflow of blood during contraction. ]

Question : Single circulation i.e., blood flows through the heart only once during one cycle of passage through the body, is exhibited by

(a) Labeo, Chameleon, Salamander

(b) Hippocampus, Exocoetus, Anabas

(d) Whale, Dolphin, Turtle

Answer : (b) Hippocampus, Exocoetus, Anabas

[ These organisms exhibit single circulation, where blood flows through the heart only once during one cycle of passage through the body. ]

Question : In which of the following vertebrate group/groups, heart does not pump oxygenated blood to different parts of the body?

(a) Pisces and amphibians

(b) Amphibians and reptiles

(d) Pisces only

Answer : (d) Pisces only

[ In fishes (Pisces), the heart pumps oxygenated blood only to the gills for oxygenation, and then the oxygenated blood is distributed to the rest of the body.]

Question : Choose the correct statement that describes arteries.

(a) They have thick elastic walls, blood flows under high pressure; collect blood from different organs and bring it back to the heart

(b) They have thin walls with valves inside, blood flows under low pressure and carry blood away from the heart to various organs of the body

(c) They have thick elastic walls, blood flows under low pressure ; carry blood from the heart to various organs of the body

(d) They have thick elastic walls without valves inside, blood flows under high pressure and carry blood away from the heart to different parts of the body.

Answer : (d) They have thick elastic walls without valves inside, blood flows under high pressure, and carry blood away from the heart to different parts of the body.

[ Arteries are vessels that carry oxygenated blood away from the heart to various parts of the body. They have thick and elastic walls, and they operate under high pressure due to the force generated by the heart's pumping action. Arteries do not have valves. ]

Question : The filtration units of kidneys are called

(a) ureter

(b) urethra

(d) nephrons

Answer : (d) Nephrons

[ The filtration units of the kidneys are called nephrons ]

Question : Oxygen liberated during photosynthesis comes from

(a) water

(b) chlorophyll

(d) glucose

Answer : (a) Water

[ During photosynthesis, oxygen is liberated as a byproduct, and it comes from the splitting of water molecules. ]

Question : The blood leaving the tissues becomes richer in

(a) carbon dioxide

(b) water

(d) oxygen

Answer : (a) Carbon dioxide

[ The blood leaving the tissues becomes richer in carbon dioxide. This carbon dioxide is produced as a waste product of cellular respiration in the tissues.]

Question : Which of the following is an incorrect statement?

(a) Organisms grow with time

(b) Organisms must repair and maintain their structure

(d) Energy is essential for life processes

Answer : (c) Movement of molecules does not take place among cells

[ Cells require the movement of various molecules, such as nutrients and signaling molecules, to carry out their functions and maintain cellular processes.]

Question : The internal (cellular) energy reserve in autotrophic is

(a) glycogen

(b) protein

(d) fatty acid

Answer : (c) Starch

[ Starch is the primary internal (cellular) energy reserve in autotrophic . ]

Question : Which of the following equations is the summary of photosynthesis?

(a)

(b)

(c)

(d)

Answer : (c)

[ This equation represents the process of photosynthesis, where carbon dioxide and water, in the presence of chlorophyll and sunlight, are converted into glucose and oxygen.]

Question : Choose the event that does not occur in photosynthesis

(a) Absorption of light energy by chlorophyll

(b) Reduction of carbon dioxide to carbohydrates

(d) Conversion of light energy to chemical energy

Answer : c) Oxidation of carbon to carbon dioxide

[ In photosynthesis, carbon dioxide is reduced to carbohydrates, not oxidized to carbon dioxide. ]

Question : The opening and closing of the stomatal pore depends upon

(a) oxygen

(b) temperature

(d) concentration of CO2 in stomatal

Answer : (c) Water in guard cells

[ The opening and closing of the stomata pore depend upon the turgor pressure in the guard cells, which is influenced by the uptake or loss of water by these cells.]

Question : Choose the forms in which most plants absorb nitrogen

(i) Proteins

(ii) Nitrates and Nitrites

(iii) Urea

(iv) Atmospheric nitrogen

(a) (i) and (ii) (b) (ii) and (iii)

Answer : (b) (ii) and (iii)

[ Most plants absorb nitrogen in the form of nitrates and nitrites (ii) from the soil. Urea (iii) can also be a nitrogen source for some plants. ]

Question : Which is the first enzyme to mix with food in the digestive tract?

(a) Pepsin

(b) Cellulase

(d) Trypsin

Answer : (c) Amylase .

[ Amylase is the first enzyme to mix with food in the digestive tract. It is responsible for the breakdown of carbohydrates into simpler sugars. ]

Question : Which of the following statement(s) is (are) correct?

(i) Pyruvate can be converted into ethanol and carbon dioxide by yeast

(ii) Fermentation takes place in aerobic bacteria

(iii) Fermentation takes place in mitochondria

(iv) Fermentation is a form of anaerobic respiration

(a) (i) and (iii) (b) (ii) and (iv)

Answer : (c) (i) and (iv)

[ (i) Pyruvate can be converted into ethanol and carbon dioxide by yeast, a process known as alcoholic fermentation. (iv) Fermentation is a form of anaerobic respiration.]

Question : Lack of oxygen in muscles often leads to cramps among cricketers. This results due to

(a) conversion of pyruvate to ethanol

(b) conversion of pyruvate to glucose

(d) conversion of pyruvate to lactic acid

Answer : (d) conversion of pyruvate to lactic acid .

[ Lack of oxygen in muscles often leads to cramps among cricketers due to the conversion of pyruvate to lactic acid. ]

Question : Choose the correct path of urine in our body

(a) kidney → ureter → urethra → urinary bladder

(b) kidney → urinary bladder → urethra → ureter

(d) urinary bladder → kidney → ureter → urethra

Answer : (c) kidney → ureters → urinary bladder → urethra.

[ Urine is produced in the kidneys, travels through the ureters, is stored in the bladder, and exits through the urethra. ]

Question : During deficiency of oxygen in tissues of human beings, pyruvic acid is converted into lactic acid in the

(a) cytoplasm

(b) chloroplast

(d) golgi body

Answer : (a) cytoplasm.

[ During the deficiency of oxygen in tissues of human beings, pyruvic acid is converted into lactic acid in the cytoplasm. ]