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Published on: 27/02/2020
10th standard science Pre Public Model Question paper ( biology )-2019 -2020
Download Tamil Nadu 10th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Science Test1.
Mitochondria was discovered by ___________
Sachs
Kelvin
Melvin
Kolliker
2.
Identify the wrong statement
Guttation occurs through stomata
Water molecules stick to xylem because of adhesion
Stomata closes when guard cells are not turgid
Elements like calcium are not remobilised
3.
Leeches have ___________
heart
lungs
true blood vessels
excretory organs
4.
Which one of the following shows correct composition of blood?
Plasma - Blood + Lymphocyte
Serum - Blood + Fibrinogen
Lymph - Plasma + RBC + WBC
Blood - Plasma + RBC + WBC + Platelets
5.
‘Heart of Heart’ is called
SA node
AV node
Purkinje fibres
Bundle of His
6.
Which is the correct sequence of blood flow
Ventricle → atrium → vein → arteries
Atrium → ventricle → veins → arteries
Atrium → ventricle → arteries → vein
Ventricles → vein → atrium → arteries
7.
Which of the following process requires energy?
Active transport
Diffusion
Osmosis
All of them
8.
The body of leech has
23 segments
33 segments
38 segments
30 segments
9.
Pharyngeal ganglion in leech is a part of
Excretory system
Nervous system
Reproductive system
Respiratory system
10.
The segments of leech are known as
Metameres (somites)
Proglottids
Strobila
All the above
11.
Which is formed during anaerobic respiration
Carbohydrate
Ethyl alcohol
Acetyl CoA
Pyruvate
12.
The xylem and phloem arranged side by side on same radius is called _________
radial
amphivasal
conjoint
None of these
13.
The endarch condition is the characteristic feature of
root
stem
leaves
flower
14.
The phloem is responsible for the translocation of food.
15.
An anticoagulant present in saliva of leech is called heparin.
16.
In monocot stem cambium is present in between xylem and phloem.
17.
Leucopenia
18.
Root Pressure
19.
Amphivasal
20.
Amphicribal
21.
Mention the artery which supplies blood to the heart muscle.
22.
Name the heart valve associated with the major arteries leaving the ventricles.
23.
What is the shape of RBC in human blood?
24.
Name two layered protective covering of human heart.
25.
How does leech suck blood from the host?
26.
How is diastema formed in rabbit?
27.
Give the common name of the Hirudinaria granulosa
28.
Name the phenomenon by which carbohydrates are oxidized to release ethyl alcohol.
29.
Where does the carbon that is used in photosynthesis come from?
30.
What is collateral vascular bundle?
31.
Who discovered Rh factor? Why was it named so?
32.
What is cohesion?
33.
Why are the rings of cartilages found in trachea of rabbit?
34.
Why should the light dependent reaction occur before the light independent reaction?
35.
Write a short note on mesophyll.
36.
Differentiate the following
a) Monocot root and Dicot root
b) Aerobic and Anaerobic respiration
37.
Transpiration is a necessary evil in plants. Explain.
38.
Shylesh has some pet animals at his home. He has few rabbits too, one day while feeding them he observed something different with the teeth. He asked his grandfather, why is it so? What would have been the explanation of his grandfather?
39.
How is the digestive system of rabbit suited for herbivorous mode of feeding?
40.
Assertion: Pholem conducts food materials to different parts of the plant.
Reason: Xylem conducts water and minerals to different parts of the plant.
Codes:
(a) Both Assertion and Reason are true and Reason is 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) Both Assertion and Reason are false
41.
Assertion: In fishes the oxygenated and deoxygenated blood are mixed.
Reason: The blood passes through the heart only once.
Codes:
(a) Both assertion and reason are true and reason is 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) Both assertion and reason are false.
42.
Assertion: Rabbit is a herbivorous animal
Reason: Canines are absent in rabbit
Codes:
(a) Both Assertion and Reason are true and Reason is 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) Both Assertion and Reason are false.
43.
What is protoxylem lacuna?
44.
What is exarch xylem?
45.
Valves present at the base of the aorta.
46.
Artery which arises from left ventricle.
47.
What is a dental formula?
48.
Do leeches have eyes and ears.
1.
(d)
Kolliker
2.
(a)
Guttation occurs through stomata
3.
(d)
excretory organs
4.
(d)
Blood - Plasma + RBC + WBC + Platelets
5.
(a)
SA node
6.
(c)
Atrium → ventricle → arteries → vein
7.
(a)
Active transport
8.
(b)
33 segments
9.
(b)
Nervous system
10.
(a)
Metameres (somites)
11.
(b)
Ethyl alcohol
12.
(c)
conjoint
13.
(b)
stem
14.
True
15.
False
Correct Statement : An anticoagulant present in saliva of leech is called hirudin.
16.
False
Correct Statement : In monocot stem cambium is not present in between xylem and phloem.
17.
Decrease in leucocytes
18.
Pressure in xylem
19.
Dracaena
20.
Fern
21.
Coronary artery supply blood to the heart.
22.
Semilunar valves associated with the major arteries leaving the ventricles.
23.
RBCs are biconcave and disc - shaped.
24.
Pericardium
25.
The Ieech makes a triradiate or 'Y' shaped incision in the skin of the host by the jaws protruded through the mouth and sucks the blood by muscular pharynx.
26.
Diastema is a gap between incisors and premolar formed due to absence of canine.
27.
The Indian cattle leech.
28.
Anaerobic respiration is a process by which carbohydrates are converted into ethyl alcohol.
29.
The carbon that is used in photosynthesis comes from carbon dioxide, or CO2 that's present in our atmosphere.
30.
When xylem lies towards the centre and phloem lies towards the periphery, it is called collateral vascular bundle.
31.
(i) Rh factor was discovered by Landsteiner and Wiener in 1940. It was named so because it was first discovered in Rhesus monkey.
32.
The force of attraction between molecules of water is called cohesion.
33.
Rings of cartilages are found in the tracheal walls of rabbit to help in the free passage of air.
34.
(i) During Iight independent reaction CO2 is reduced to carbohydrate by ATP and NADPH2 which are generated during light dependent reaction.
(ii) So light dependent reaction should occur before the light independent reaction.
35.
(i) The tissue present between the upper and the lower epidermis is called mesophyll.
(ii) Mesophyll cells contain chloroplasts.
(iii) In dicot leaf, the mesophyll is differentiated into palisade parenchyma and spongy parenchyma.
(iv) Palisade cells do not have intercellular spaces and take active part in photosynthesis.
(v) Whereas, spongy parenchyma cells have large intercellular spaces and helps in gaseous exchange.
36.
a) Monocot root and dicot root
|
S.No |
Tissues |
Monocot Root |
Dicot Root |
|---|---|---|---|
| i | Number of Xylem | Polyarch | Tetrarch |
| ii | Cambium | Absent | Present (During secondary growth only) |
| iii | Secondary Growth | Absent | Present |
| iv | Pith | Present | Absent |
b) Aerobic respiration and anaerobic Respiration:
| Basis for Comparison |
Aerobic Respiration |
Anaerobic Respiration |
|---|---|---|
| It occurs in | The cytoplasm and mitochondria. | Cytoplasm only. |
| Final product | Carbon dioxide, water and energy |
Carbon dioxide, Lactic acid (animal cells), ethanol (plant cell) and energy |
| It requires | Oxygen and glucose to produce energy |
It does not require oxygen but uses glucose to Produce energy |
| Number of ATP released | 38 ATP. | 2 ATP. |
37.
(i) During transpiration, water is lost from leaves.
(ii) Still transpiration is essential for the movement of water and minerals from the root to the healthy parts of the plant.
(iii) But excess transpiration may result in drying up of the leaves or wilting and loss of soil water.
(iv) Hence it is termed as a necessary evil.
38.
(i) Canines are absent.
(ii) Hence, a gap is seen between the incisors and premolars.
(iii) This is called diastema.
(iv) It helps in mastication and chewing of food in herbivorous animals.
39.
(i) Herbivores have a more specialised digestive system than that of a carnivore because it is more difficult to digest vegetarian than meat.
(ii) Plant material is difficult to digest, particularly plant cellulose.
(iii) The herbivorous animals have a longer intestine than the carnivorous animals giving more time for digestion.
(iv) The teeth is also designed to grind the grass and plant material rather than the sharp teeth of carnivores designed to tear flesh.
40.
(b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
41.
(a) Both Assertion and Reason are true and Reason is correct explanation of Assertion
42.
(a) Both Assertion and Reason are true and Reason is correct explanation of Assertion
43.
In mature vascular bundle, the lower most protoxylem disintegrates and form a cavity
44.
Protoxylem lies towards the periphery and metaxylem lies towards the centre. Eg: roots.
45.
Semilunar valves.
46.
Aorta
47.
(i) Dental formula is the simple method of representing the teeth of a mammal. The number of each kind of tooth in the upper and the lower jaws on one side is counted.
(ii) In rabbit, the dental formula is
\(\left( 1,{ \cfrac { 1 }{ 1 } ,C\cfrac { 0 }{ 0 } ,PM\cfrac { 3 }{ 2 } ,M\cfrac { 3 }{ 3 } } \right) \) which is written as \(\cfrac { 2033 }{ 1022 } \) . Canines are absent
48.
Leeches do not have ears,but can sense vibrations through their skin.
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Tamilnadu Stateboard 10th Standard Subjects
Tamilnadu Stateboard Standards
