CBSE Class 10 Biology Life Processes Nutrition Worksheet Set C

Question. The autropic mode of nutrition requires
(a) carbon dioxide and water.
(b) chlorophyll.
(c) sunlight.
(d) all of the above

Answer: D

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
(c) trypsin and lipase digest fats
(d) trypsin digests proteins and lipase emulsified fats

Answer: D

Question. Why blood is red?
(a) due to presence of oxygen
(b) due to presence of haemoglobin
(c) due to presence of CO₂
(d) due to presence of WBC

Answer: B

Question. Choose the correct path of urine in our body
(a) kidney →ureter →urethra →urinary bladder
(b) kidney →urinary bladder →urethra →ureter
(c) kidney →ureters →urinary bladder →urethra
(d) urinary bladder →kidney →ureter →urethra

Answer: B

Question. The breakdown of pyruvate to give carbon dioxide, water and energy takes place in
(a) cytoplasm.
(b) mitochondria.
(c) chloroplast.
(d) nucleus.

Answer: B

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

Answer: D

Question. The parts shown as A and B in the given diagram are
The parts shown as A and B in the given diagram are
(a) A is epidermal cell, B is stomatal pore
(b) A is guard cell, B is stomatal pore
(c) A is epidermal cell, B is guard cell
(d) A is guard cells, B is epidermal cell

Answer: B

Question. The inner lining of stomach is protected by one of the following from hydrochloric acid. Choose the correct one
(a) Pepsin
(b) Mucus
(c) Salivary amylase
(d) Bile

Answer: B

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
(c) They convert carbon dioxide and water into carbohydrates in the absence of sunlight
(d) They constitute the first trophic level in food chains

Answer: C

Question. Haemoglobin is a type of
(a) Carbohydrate
(b) Skin Pigment
(c) Vitamin
(d) Respiratory Pigment

Answer: D

Question. In normal expiration, the diaphragm is
(a) Arched
(b) Flattened
(c) Perforated
(d) None of these

Answer: A

Question. The correct pathway of blood in circulatory system is
(a) atria → ventricles → arteries → veins
(b) ventricles → atria → veins → arteries
(c) ventricles → veins → arteries → atria
(d) veins → ventricles → atria → arteries

Answer: A

Question. If kidney fails to reabsorb water, the tissues would
(a) remain unaffected
(b) shrink to shrivel
(c) absorb water from blood
(d) take more oxygen from blood

Answer: B

Question. The breakdown of pyruvate to give carbon dioxide, water and energy takes place in
(a) cytoplasm.
(b) mitochondria.
(c) chloroplast.
(d) nucleus.

Answer: B

Question. Full form of ATP?
(a) Adenosine Triphosphate
(b) Adenosine Tetraphosphate
(c) Adenine Triphosphate
(d) Adinosine Tripolymer

Answer: A

Question. Villi present on the inner lining of the intestinal wall
(a) Secretes enzymes for digestion
(b) Secretes hormones
(c) Decreases the surface area for absorption
(d) Increases the surface area for absorption

Answer: D

Question. The xylem in plants are responsible for
(a) transport of water.
(b) transport of food.
(c) transport of amino acids.
(d) transport of oxygen

Answer: A

Question. During cellular respiration one molecule of glucose is first broken down into two molecules of
(a) Acetic acid
(b) Pyruvic acid
(c) Lactic acid
(d) None of the above

Answer: B

Question. Respiration is a process in which
(a) Energy is stored in the form of ADP
(b) Energy is released and stored in the form of ATP
(c) Energy is used up
(d) Energy is not released at all.

Answer: B

Question. Chyme is ____.
(a) Digestive enzyme secreted by stomach.
(b) Hormone secreted by islets of Pancreas
(c) food which enters into intestine from stomach.
(d) Part of bile juice which stores in gall bladder

Answer: B

ASSERTION AND REASON QUESTIONS:

Following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Question. Assertion (A): The inner lining of the small intestine has numerous finger-like projections called villi.
Reason (R) : The villi increase the surface area for absorption.

Answer: A

Question. Assertion (A) : Ureters are the tubes which carry urine from kidneys to the bladder.
Reason (R): Urine is stored in the urethra.

Answer: C

Question. Assertion (A): Diffusion does not meet high energy requirements of multi-cellular organisms
Reason (R) : Diffusion is a fast process but occurs at the surface of the body.

Answer: C

Question. Assertion (A): The purpose of making urine is to filter out undigested food from intestine
Reason (R): Kidneys filter the waste and produce urine.

Answer: D

Question. Assertion (A) : Photosynthesis takes place in green parts of the plants.
Reason (R) : Photosynthesis always takes place in leaves.

Answer: C

VERY SHORT ANSWER QUESTIONS:

Question. State two differences between arteries and veins.
Answer: Arteries: Arteries carry oxygenated blood, away from the heart except pulmonary artery. These are thick-walled, highly muscular except arteries of cranium and vertebral column. Valves are absent. Blood in arteries moves with pressure.
Veins: Veins carry deoxygenated blood, towards the heart except pulmonary veins. These are thin-walled. Valves are present which provide unidirectional flow of blood. Blood in veins moves under very low pressure.

Question. Name one accessory pigment and one essential pigment in photosynthetic plants.
Answer: Accessory pigment – Carotene/Xanthophyll Essential pigment – Chlorophyll

Question. (i) Write the balanced chemical equation for the process of photosynthesis,
(ii) When do the desert plants take up carbon dioxide and perform photosynthesis ?
Answer: (i) Photosynthesis can be represented using a chemical equation. The overall balanced equation is
(ii) Desert plants open up their stomata during night and take in CO₂. Stomata remains close during the day time to prevent the loss of water by i transpiration. They store the CO₂ in their cells until the sun comes out and they can carry on with photosynthesis during the day time.

Question. Give one reason why multicellular organisms require special organs for exchange of gases between their body and their environment.
Answer: In unicellular organisms the entire body of the organism is in contact with the environment hence exchange of materials can take place but, in multicellular organisms the entire body of the organism is not in contact with the environment and hence simple diffusion is not helpful.

SHORT ANSWER QUESTIONS:

Question. (a) “The breathing cycle is rhythmic whereas exchange of gases is a continuous process”. Justify this statement.
(b) What happens if conducting tubes of circulatory system develops a leak? State in brief, how could this be avoided?
(c) How opening and closing of stomata takes place?
Answer: (a) The breathing cycle involves inhalation and exhalation of air due to alternate expansion and contraction of thoracic cavity. Thus it is a rhythmic process. But exchange of gases is a continuous process as it takes place between the blood and each and every cell, by diffusion.
(b)The circulatory system will become inefficient if it develops a leak. This could be avoided by maintaining a normal blood pressure.
(c) When water flows into the guard cells, the guard cells swell and the stomatal pore opens up. When water moves out the guard cells shrinks and the stomatal pore closes.

Question. Explain the process of breakdown of glucose in a cell
Answer: The processes of breakdown of glucose in a cell are as follows:

Question. List three characteristics of lungs which make it an efficient respiratory surface.
Answer: These features which particularly make our lungs efficient for gas exchange.
i. Thin: the air sac walls are very thin so that gases can quickly diffuse through them. Oxygen is absorbed in to the blood and carbon dioxide is given out in to the lungs to be exhaled out.
ii. Moist: the air sacs are moist with mucus so that gases can dissolve before diffusing.
iii. Large surface area: The surface area for gases to diffuse through in human lungs is roughly the same as a tennis court. The alveoli help to increase the surface area for absorption of oxygen.
iv. Good blood supply:The air sacs or the alveoli have a large capillary network so that large volumes of gases can be exchanged. More the flow of blood more exchange.

LONG ANSWER QUESTIONS:

Question.(a) Draw a schematic representation of transport and exchange of oxygen and carbon dioxide during transportation of blood in human beings and label on it:
Lung capillaries, Pulmonary artery to lungs, Aorta to body, Pulmonary veins from lungs.
(b) What is the advantage of separate channels in mammals and birds for oxygenated and deoxygenated blood?
Answer: (a) A schematic representation of transportation and exchange of oxygen and carbon dioxide during transportation of blood in human beings.
(b) It is necessary to separate oxygenated and deoxygenated blood in mammals and birds because they need high energy and large amount of oxygen. The separation of oxygenated and deoxygenated blood provides high oxygen supply to the organs.

Question. (a) Draw a sectional view of the human heart and label on it – Aorta, Right ventricle and Pulmonary veins.
(b) State the functions of the following components of transport system: (i) blood (ii) lymph
Answer: (b) The functions of blood and lymph are as follows:
Blood
Oxygen is transported by the blood to the tissues of the body for the breakdown of digested food.
Carbon dioxide is transported to the lungs by the blood plasma.
The digested and absorbed nutrients are transported by blood to the tissues.
Nitrogenous wastes are transported to the kidneys.
It regulates the body temperature and maintains the pH of the body tissues.
It transports various hormones from one region to another and bring about the coordination.
It maintains water balance to constant level.
The lymphocytes produce antibodies against the invading antigens and protect from diseases.
It helps in rapid healing of wounds by forming a clot at the site of injury.
Lymph
It cleans the cellular environment.
It returns proteins and tissue fluids to the blood (drainage)
It provides a pathway for the absorption of fats and fat-soluble vitamins into the bloodstream.
It defends the body against disease.

Question. State the role of the following in human digestive system :
(I) Digestive enzymes (II) Hydrochloric acid ( III) villi
Answer: Digestive enzymes – Foods need to be broken into their small or simpler molecules so that they can be absorbed into the bloodstream. However, the physical breakdown of food is not enough.
Enzymes are hence needed for the chemical breakdown of food and speeding up the digestive process. The products of digestion can hence be small enough to be absorbed.
Hydrochloric acid – Hydro chloric acid helps to kill the germs which might have entered in to the system through food. It creates acidic medium for the pepsin to act on food to
breakdown proteins.
Villi – Villi are finger like projections in the small intestine. They help to increase the surface area for absorption of the digested food. Villi are richly supplied with blood vessel which
help to absorb digested food in to the blood stream.

Question. (a) Explain how does the exchange of gases occur in plants across the surface of stems, roots and leaves.
(b) How are water and minerals transported in plants?
Answer: (a) In plants, there are tiny pores called stomata on leaves and lenticels in stem which facilitate the exchange of gases. CO₂ is taken in and O₂ given out (during photosynthesis) and viceversa during respiration.
(b) Mechanism of Transport of Water and Minerals in a Plant
The vessels and tracheids of roots, stems and leaves in xylem tissue are interconnected to form a continuous system of water-conducting channels reaching all parts of the plant. The cells of the roots in contact with the soil actively take up ions which creates a difference in the ion concentration between the root and the soil.Thus, there is steady movement of water into root xylem from the soil, creating a column of water that is pushed upwards.
Plant uses another strategy to move water in the xylem upwards to the highest points of the plant body. The water which is lost through the stomata is replaced by water from the
xylem vessels in the leaf. Evaporation of water molecules from the cells of a leaf creates a suction which pulls water from the xylem cells of roots. This loss of water is transpiration
which helps in the absorption and upward movement of water and minerals dissolved in it from roots to the leaves. Transpiration becomes the major driving force in movement of
water in the xylem during the day when the stomata are open. This mechanism is also known as cohesion of water theory or transpiration pull.

Question. (a) Draw a diagram to show open stomatal pore and label on it:
(i) guard cells (ii) chloroplast
(b) State two functions of stomata.
(c) How do guard cells regulate the opening and closing of stomatal pore?
Answer: (b) Two functions of stomata are:
(i) Exchange of gases between the plant and the atmosphere takes place through stomata.
(ii)Transpiration in plants takes place through stomata.
(c) Opening and Closing of Stomatal Pore: The opening and closing of the pore is a function of the guard cells. The guard cells swell when water flows into them causing the stomatal pore to open. Similarly, the pore closes if the guard cells shrink. As large amount of water is lost through these stomata, the plant closes these pores when it does not require carbon dioxide for photosynthesis.

Please click on below link to download CBSE Class 10 Biology Life Processes Nutrition Worksheet Set C