Question Set B

CBSE 10th Science Life Processes Sample Question Papers Study Material - QB365

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Questions:

Multiple Choice Question

20 x 1 = 20

The transport of soluble products of photosynthesis is known as

(a)

Evaporation

(b)

Translocation

(c)

Transpiration

(d)

Conductions

One cell-thick vessels are called

(a)

Arteries

(b)

Veins

(c)

Capillaries

(d)

Pulmonary artery

III human beings respiratory pigment is

(a)

Chlorophyll

(b)

Water

(c)

Blood

(d)

Haemoglobin

In the experiment, CO₂ is essential for photosynthesis, KOH is kept

(a)

To seal the chamber

(b)

To absorb CO₂

(c)

To support the plant while CO₂ is absent

(d)

Both (b) and (c)

Function of chlorophyll in photosynthesis is

(a)

Absorbing light energy

(b)

Breaking down H₂O molecule

(c)

No function

(d)

Reduction of CO₂

Deoxygenated blood enters the heart through

(a)

Right ventricle

(b)

Right atrium

(c)

Light ventricle

(d)

Left atrium

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

(c)

Non conversion of glucose to pyruvate

(d)

Conversion of pyruvate to lactic acid

Opening and closing of the stomatal pore depends upon

(a)

atmospheric temperature

(b)

oxygen concentration around stomata

(c)

carbon dioxide concentration around stomata

(d)

water content in the guard cells

The internal (cellular) energy reserve in autotrophs is

(a)

Glycogen

(b)

Protein

(c)

Starch

(d)

Fatty acid

10.

The filtration units of kidneys are called

(a)

Ureter

(b)

Urethra

(c)

Neurons

(d)

Nephrons

11.

What prevents backflow of blood inside the heart during contraction?

(a)

Valves in heart

(b)

Thick muscular walls of venticles

(c)

Thin walls of atria

(d)

All of the above

12.

During respiration exchange of gases take place in

(a)

Trachea and larynx

(b)

Alveoli of lungs

(c)

Alveoli and throat

(d)

Throat and larynx

13.

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

(c)

nitrogen

(d)

water vapour

14.

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

(c)

fats

(d)

Starch

15.

Which part of alimentary canal receives bile from the liver?

(a)

Stomach

(b)

Small intestine

(c)

Large intestine

(d)

Oesophagus

16.

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)

Oesophagus

17.

In 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

(c)

Fats breaking down into fatty acids and glycerol

(d)

Absorption of vitamins

18.

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

(a)

Mouth \(\longrightarrow\)Stomach\(\longrightarrow\)Small intestine \(\longrightarrow\) Oesophagus \(\longrightarrow\) large intestine

(b)

Mouth \(\longrightarrow\) oesophagus \(\longrightarrow\) stomach \(\longrightarrow\) large intestine \(\longrightarrow\) small intestine

(c)

Mouth \(\longrightarrow\) stomach \(\longrightarrow\) oesophagus \(\longrightarrow\) small intestine \(\longrightarrow\) large intestine

(d)

Mouth \(\longrightarrow\) oesophagus \(\longrightarrow\) stomach \(\longrightarrow\)small intestine \(\longrightarrow\) large intestine

19.

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

(a)

Cytoplasm

(b)

Mitochondria

(c)

Chloroplast

(d)

Nucleus

20.

The xylem in plants is responsible for

(a)

Transport of water

(b)

Transport of food

(c)

Transport of amino acids

(d)

Transport of oxygen

Generic 2

6 x 2 = 12

21.

Give the role of the following in plants and animals:
(a) Guard cells
(b) Tracheids and vessels
(c) Lymph
(d) Phloem
(e) Bio-catalyst

22.

(a) What is the role of HCl in our stomach?
(b) What is emulsification of fats?
(c) Which protein digesting enzyme is present in pancreactic juice?

23.

What will happen if platelets were absent in the blood?

24.

Name the correct substrates for the following enzymes
(i)Trypsin (ii)Amylase
(iii)Pepsin (iv)Lipase

25.

Why is the rate of breathing in aquatic organism much faster than in terrestrial organisms?

26.

Differentiate between an artery and vein.

Generic 3

4 x 3 = 12

27.

Name the excretory organs of the human excretory system. Show all the organs with a labelled diagram.

28.

Label p, Q and R in the alimentary canal above and state the function of each. Explain what happens to fat at R.

29.

Name the constituents of blood.Why white blood corpuscles are called 'soldiers of the body'?

30.

Give reasons for the following:
(i)The glottis is guarded by epiglottis
(ii)The lung alveoli are covered with blood capillaries.
(iii)The wall of trachea is supported by cartilage rings.

Generic 5

3 x 5 = 15

31.

Give reasons
(i) Ventricles have thicker muscular walls than atria.
(ii) Transport system in plants is slow.
(iii) Circulation of blood in aquatic vertebrates differs from that in terrestrial vertebrates.
(iv) During the daytime, water and minerals travel faster through xylem as compared to the night.
(v) Veins have valves whereas arteries do not.

32.

(a) Explain, how urine is produced in human body?
(b) What are the excretory wastes in plants?

33.

What are stomata? Draw a labelled diagram of stomata. Write two functions of stomata

Assertion and reason

4 x 1 = 4

34.

Assertion (A) Left atrium receives oxygenated blood from pulmonary vein.
Reason (R) Right atrium transfers deoxygenated blood to the right ventricle, which pumps it to the lungs for oxygenation.
(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

35.

Assertion (A) The inner walls of the small intestine have finger-like projections called villi which are rich in blood.
Reason (R) These villi have a large surface area to help the small intestine in completing the digestion of food.
(a) If both A and R are true and R is the correct explanation of A
(b) If both A and R are true, but R is not the correct explanation of A
(c) If A is true, but R is false
(d) If A is false, but R is true

36.

Assertion: Ureters are the tubes which carry urine from kidneys to the bladder.
Reason: Urine is stored in the urethra.
Codes
(a) Both A and R are true and R is correct explanation of the assertion.
(b) Both A and R are true but R is not the correct explanation of the assertion.
(c) A is true but R is false.
(d) A is false but R is true.

37.

Assertion: Oxygen is more readily soluble in water than carbon dioxide.
Reason: Hence it gets transported easily through blood.
Codes
(a) If both assertion and reason are true and the reason is correct explanation of assertion.
(b) If both assertion and reason are true but reason is not a correct explanation of assertion.
(c) If assertion is true and reason is false.
(d) If both assertion and reason are false.

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Answers Key:

Multiple Choice Question

20 x 1 = 20

(b)
Translocation

(d)
Haemoglobin

(b)
To absorb CO₂

(a)
Absorbing light energy

(b)
Right atrium

(d)
Conversion of pyruvate to lactic acid

(d)
water content in the guard cells

10.

(d)
Nephrons

11.

(a)
Valves in heart

12.

(b)
Alveoli of lungs

13.

(b)
carbon dioxide

14.

(d)
Starch

15.

(b)
Small intestine

16.

(b)
Mucus

17.

(b)
Starch breaking down into sugars

18.

(d)
Mouth \(\longrightarrow\) oesophagus \(\longrightarrow\) stomach \(\longrightarrow\)small intestine \(\longrightarrow\) large intestine

19.

(b)
Mitochondria

20.

(a)
Transport of water

Generic 2

6 x 2 = 12

21.

(a) Stomatal opening
(b) Transport of water
(c) Fat transport
(d) Transport of food
(e) Speeding up digestive process

22.

(a) The HCl provides acidic medium for the action of enzyme pepsin to act and break down the proteins. It kills the germs, microbes and pathogens that enter the stomach.
(b) The breaking down of big fat globules into the smaller ones is called emulsification of fats.
(c) Trypsin

23.

If platelets are not present in the blood, then clotting at the site of injury will not take place. This will result in continuous bleeding and could be fatal for the organism.

24.

(i)Protein
(ii)Starch
(iii)Protein
(iv)Fats

25.

Aquatic organisms like fishes obtain oxygen from water present in dissolved state through their gills. Since the amount of dissolved oxygen is fairly low compared to the amount of oxygen in the air, the rate of breathing in aquatic organisms is much faster than that seen in terrestrial organisms.

26.

S.No	Arteries	Veins
1	Have thick elastic, muscular walls.	Have thin, non-elastic walls.
2	Lumen is narrow	Lumen is wide
3	Carry blood from heart to all body parts.	Carry blood from all body parts to heart
4	Carry oxygenated blood (except pulmonary artery)	Carry deoxygenated blood (except pulmonary vein)

Generic 3

4 x 3 = 12

27.

ExcretoryOrgan
(i) A pair of kidneys
(ii) A pair of ureter
(iii) A urinary bladder
(iv) A urethra

28.

1. P is gall bladder, it stores the bile secreted by liver.
2. R is small intestine and helps in the complete digestion of food where pancreatic enzymes are released.
3. Q is the lower part of the small intestine where the absorption of digested food takes place.
4. At R the fat is emulsified and the big fat globule is broken down into the small ones.

29.

The different constituents of blood are plasma (the fluid part of the bloo(d) and blood corpuscles consisting of RBCs, WBCs, and platelets)
WBCs are known as the soldiers of the body because they fight against the pathogenes that invade our body, thus preventing the occurence of diseases.

30.

(i)The glottis is gaurded by epiglottis because it prevents the entry of food in wind pipe. If the food enters wind pipe, then it chokes it, leading to the death of the person.
(ii)The lung alveoli are covered with blood vessels because the oxygen that we inhale dissolves in the blood, present in these blood capillaries only, as it reaches the lungs.
(iii)The wall of trachea is supported by cartilage rings because these rings prevent the air passage from collapsing.

Generic 5

3 x 5 = 15

31.

(i) Ventricles have to pump blood out of the heart into various organs of the body, therefore they have thicker muscular walls than atria.
(ii) Plants do not move and have a large proportion of dead cells in many tissues. As a result, plants have low energy needs and therefore transport system in plants is slow.
(iii) Circulation of blood in aquatic vertebrates such as fishes differs from that in terrestrial vertebrates as fishes have two-chambered heart. The blood is pumped to the gills for oxygenation and is then transported to the rest of the body.
On the other hand, most terrestrial vertebrates have lungs for oxygenation of blood. The deoxygenated blood is transported to heart from where it is transported to lungs for oxygenation and is then distributed to all body parts.
(iv) During daytime, due to transpiration pull, more water is absorbed by roots that is why absorption is faster in daytime.
(v) Veins have valves whereas arteries do not because valves have to prevents the back flow of blood as blood flows in them at low pressure.

32.

(a) Renal artery carrying all the impurities in blood reaches kidney. In kidney, there are small functional units called nephron which receives this blood and the impurities along with water is squeezed out in Bowman's capsule. It is due to the glomerulus i.e., the coiled structure of afferent renal artery. The water and impurities are collected in a tubule which enters the ureter. After filtration, reabsorbtion of required, useful products takes place before it enters the ureter. Finally ureter receives the urine, with lot of urea in water and is collected in urinary bladder.

Excretory wastes in plants:
(i) The waste product of photosynthesis is oxygen and the waste product of respiration is carbon dioxide.
(ii) Excess of water is lost by transpiration.
(iii) Plants store waste material in leaves which are then shed.
(iv) Plants have tissues made up of dead cells where waste products can be stored, e.g. gums, resin in old xylem.
(v) Waste products can also be stored in cellular vacuoles.
(vi) Plants also excrete some waste substances into the soil around them.

33.

Stomata are small pores present on the leaves underside.

Two functions of stomata:
(i) Allows the exchange of gases, O₂ and CO₂.
(ii) It helps in losing extra water by transpiration and creates suction pull which helps the water to rise in xylem.

Assertion and reason

4 x 1 = 4

34.

(a) Both A and R are true and R is the correct explanation of A

35.

(c) A is true, but R is false. R can be corrected as The inner walls of the small intestine have finger-like projections called villi which are rich in blood supply. These villi increases the surface area for absorption.

36.

(c): The bladder is a bag which stores urine till the time we go to toilet. The urine collected in the bladder is passed out from the body through the urethra.

37.

(d) If both assertion and reason are false.