For Teachers use only. Section A. Question I. a b c d e. Marks Total Marks Awarded Teacher s Initial

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MHSS/ BIO/MIDTERM 2019. Page 1 of 13

MOTITHANG HIGHER SECONDARY SCHOOL THIMPHU THROMDE

“Every child is inspired to learn and empoweredwithwisdom to excel in life” MID-TERM EXAMINATION 2019

Class:10 Writing time: 2 Hours

Biology. Total marks: 100

June, 2019

Name:……….Index.no……….Class………Section……… Invigilator’s Initial

For Teachers use only

Section A Section B

Question Number Question I Qn1 Qn2 Qn3 Qn

4 Qn 5 Qn 6 a b c d e Marks 25 10 8 5 2 10 10 10 10 10 10 Total Marks Awarded Teacher’s Initial

Read the following directions carefully.

1. Do not write for the first 15 minutes. This time is to be spent reading over the questions. After having read over the questions the time given at the top of this paper is the time allowed for writing the answers.

2. On the space provided above, write your name, class and roll number.

3. In this paper there are two sections – A and B. Section A is compulsory and you are expected to attempt any five questions from Section B.

4. The intended marks for questions or parts of the questions are given in the bracket. 5. Read the directions to each questions carefully and write all your answers neatly in the

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Section A (50 Marks) Compulsory: Attempt all questions. Question no. I

a. Each question in this section is provided with four possible options. Choose the most appropriate option and circle with pen on the selected option number. [1X25=25] 1. In a particular animal cell, ribosomes were missing. We can confirm that this cell as lacks a. Divisions of the cell c. Intercellular digestion

b. Rigidity of the cell d. Protein synthesis

2. Which of the following organs is paired with its incorrect function?

a. Stomach – protein digestion c. Large intestine –bile production b. Oral cavity – starch digestion d. Small intestine – nutrient absorption 3. An important hormone produced by the stomach cells which stimulates parietal cells to

produce HCl is

a. Amylase b. Lipase c. Gastrin d. Maltase 4. In plant stems the organic food materials are transported through

a. Vascular bundles c. Xylem parenchyma b. Xylem fibres d. Phloem

5. When a cell is immersed into a hypertonic solution, water flows out of the cell in order to balance the concentration of the solutes. This process of movement of water out of the cell is called

a. Exosmosis b. Plasmolysis c. Endosmosis d. Osmosis

6. Fruits such as bananas picked unripe for the safe transport, are induced to ripen by exposure to

a. Ethylene gas b. Acetic acid c. Auxins d. Gibberellins 7. The cell given below depicts a certain phase of mitosis. The depicted phase is

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8. A liquid extracted from the stomach was mixed with some finely grounded fatty pork and kept at body temperature. After 3 hours, the fatty pork had disappeared. This is possible because of the presence of an enzyme called

a. Protease b. lipase c. Amylase d. nuclease

9. The figure given below explains the mechanism of exchange of substances between the capillaries and the tissues. The pressure which helps in the exchange of materials is known as,

a. Tissue pressure c. Turgor pressure

b. Cellular pressure d. Hydrostatic blood pressure

10. All the cells given below are living cells except

a. Companion cells c. Xylem fibres

b. Xylem parenchyma d. Phloem parenchyma

11. A women has undergone a surgery for removal of gall bladder. While being discharged from the hospital, if you were a doctor, what advice would you give her?

a. Take a diet with less proteins c. Take less quantity of liquids b. Take less sugary fruits d. Take food that contains less fats 12. Some animals are able to regenerate whole parts of their body. This is due to

a. Meiosis b. Interphase c. Mitosis d. Anaphase

13. The hormone produced by the beta cells of the pancreas which regulates the glucose level in the blood is the

a. glucagon b. insulin c. adrenalin d. glycogen

14. The figure given below is a type of white blood cell having three lobed nucleus and granules which gives purple colour when stained with leishman’s stain. The given cell is

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a. basophils c. neutrophils b. lymphocytes d. eosinophils

15. The WBCs have an special ability to engulf the foreign substances which enter inside our body. This ability of the WBCs is called

a. Clotting c. phagocytosis b. Agglutination d. inflammation

16. Salting of meat and pickles is a method of preserving food by the process of

a. osmosis. c. plasmolysis

b. turgidity. d. deplasmolysis

17. The rate of photosynthesis is NOT affected by

a. carbon dioxide concentration c. temperature

b. light intensity d. humidity

18. The CO2 released during respiration by root cells combine with water to form

a. Acetic acid b. Carbonic acid c. Citric acid d. Hydrochloric acid

19.A cell having 46 numbers of chromosomes has divided through MEIOSIS. Now the number of chromosomes in the daughter cells will be

a. 46 b. 92 c. 23 d. 32

20. While observing a cell under compound microscope Jigme observed that the cell had capsule, cell wall, cytoplasm, plasma membrane, nucleoid, ribosome, plasmid and pili. The type of cell Jigme had observed was:

a. Plant cell b. Animal cell c. Bacterial cell d.Eukaryotic cell

21. In the plants the translocation of food takes place from the

a. Sink to source c. region of lower concentration to higher concentration b. Source to sink d. region of hypotonic to hypertonic solution

22. Dawa took a stem cutting of rose to plant in his flower garden. Before planting he exposed the stem cutting to a certain plant hormone for faster development of roots. The hormone he used was

a. Ethylene b. GA c. ABA d. IAA

23. Tshering penjor applied the hormone auxin to his banana plants so as to develop seedless banana fruits.This process of developing seedless fruits without fertilization is

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24. One of the differences between flagellum and fimbria is that a. Flagellum helps in locomotion but fimbria does not b. Fimbria helps in locomotion but flagellum does not

c. Fimbria helps in attaching to surfaces while flagellum helps in locomotion d. Fimbria are found in prokaryotes and flagellum in eukaryotes

25. The pigment present in red blood cells which helps in the absorption and transportation of oxygen and carbondioxide in the blood is

a. globulin b. plasma c. haemoglobin d. nucleus

b. Fill in the blanks with the correct choice of word/s. [1x10=10]

i. Thromboplastin helps in conversion of prothrombin to thrombin in presence of ………..……..

ii. When green plants are fed radioactive 14CO2, radioactive sugar was observed

in phloem, so this shows that……….….. of food takes place through phloem.

iii. The enzymes for the digestion of …..………..are mostly produced by our digestive system in inactive forms.

iv. Arteries and veins are two of the three main types of blood vessel. The third type of blood vessel which is much smaller is called……… v. The matured red blood cells of human lacks……….. vi. The formation of RBCs is controlled by a hormone called ………. vii. The organelle in a prokaryotic cell which performs the role of golgi bodies

and mitochondria is called ………..

viii. The chemical substance present on the surface of the RBC, which forms antibodies, is called ………

ix. When there is increase in the hematocrite of an individual it is called ……….

x. In plant cells, a new cell wall forms at the midpoint of the cell and divides the cytoplasm. This process is known as……….

c. Match the items of column A with the most appropriate items of column B. Rewrite the correct

matching pairs. [1x8=8]

Column A Column B

i. Accumulation of tissue fluids a. Calvin cycle

ii. Regulation of salt and water b. Photochemical phase iii. Munch mass flow c. oedema

iv. Karl Landsteiner d. osmoregulation v. Photosystem I e. P680

vi. Photosystem II f. translocation of food vii. Dark reaction g. blood grouping viii. Light reaction h. P700

Answer:

……….. ……….. ………

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MHSS/ BIO/MIDTERM 2019. Page 6 of 13 ……….. ……… ………. ………. ……… ……….

d. Define the following terms: (5) i. Reaction centre of photosynthesis

… ………. ……….. ………. ……… ……… .

ii. Genetic variation

……….. ……….. ……… ……… ……….. iii. Tonicity ……… ……….. ……….. ……… ……….. iv. Photolysis ……… ……….. ……… ……… ……….. v. Excretion ……… ……… ……… ……… ……… .

e. Write down the functions of the followings: (2) i. White blood cells-

……… ………. ii. Companion cells-

……… ………..

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SECTION B (50 marks). Attempt any FIVE questions from this section. Question 1.

a. The following table is the laboratory tests to identify different food groups. Study the table carefully and fill in the blanks. [1/2 x6=3]

Food Groups Procedure Observation Test for starch ……….. ……… ……… ………. ………. ……… ………… …………

Add 2 ml of oil/ butter to 2 ml of water in a testube. Add few drops of sudan III and shake it.

………. ……….. ………. ………….. …………. …………. ……… ……… ………. ……….

Purple colour appears.

b. Name any two vegetables which can be used to demonstrate the presence of protein. [1] ……… ……… ……….. c. Explain the actions of the different enzymes secreted by the salivary glands. [3]

……… ……… ……… ……… ……… ……… ……….. ……….………. ………..………. d. Explain the roles of the following parts of the alimentary canal during digestion: [3]

i. Epiglottis ……… ……… ……… ……… ... ...

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MHSS/ BIO/MIDTERM 2019. Page 8 of 13 ii. Oesophagus ……… ………. ……… ……… ………. iii. Large intestine.

……… ……… ……… ……… ……….. Question no. 2.

a. The process of blood clotting which involves three major steps are given below. Study the steps carefully and fill in the blanks shown as A. B, C and D. [4]

Prothromboplastin +Ca A………... +Ca Prothrombin Thrombin ……….. B Fibrin RBC + ……C……. + Platelets + Fibrin = ………D…….. A………., B………, C………D………. b. Write down one identifying feature each for the following white blood cells: [4]

1. Lymphocytes……… ……… ……….. 2. Neutrophils……… ……… ……… 3. Eosinophils……… ……… ……… 4. Basophils……… ……… ……….

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MHSS/ BIO/MIDTERM 2019. Page 9 of 13 c. What is haemophilia? [1] ……… ……… ……… ……… ………

d. Normally the blood does not clot inside the blood capillaries. Why? [1]

……… ……… ……… Question 3.

a. Study the equation given below and answer the questions that follows. CO2 +H2O Light + Chlorophyll C6H12O6 +H2O + O2

1. Name the phases of photosynthesis in which [2]

i. Glucose is formed………

ii. Oxygen is formed ………

2. What are the products formed during photolysis? [1]

……… ……… ……….. 3. Mention two differences between light dependent phase and light independent phase of

photosynthesis. [2] ……… ……… ……… ……… ……… 4. What is phosphorylation? [1] ……… ……….. b. Explain in your own words Blackman’s law of limiting factors. [3]

……… ……… ……… ……… ……… ……… ………

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c. Mention a difference between diffusion and active transport. [1] ……… ……… ……… Question 4.

a. Complete the following table: [1x5=5]

Name of an enzyme It acts on food substance.

e.g. erepsin Protein

Trypsin 1……….

2………. Sucrose

Nucleases 3……….

Gastric lipase 4………

Ptyalin 5………..

b. How are following nutrients used in our body? [3] i. Amino acids

……… ……… ……….. ii. Fatty acids and glycerol

……… ……….…… ……… iii. Glucose ……… ……… ……… c.Write two adaptations of small intestine for the efficient absorption of digested food. [1+1=2] ……… ……… ……… ……… ……… ………..

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MHSS/ BIO/MIDTERM 2019. Page 11 of 13 Question no 5.

a. In the table given below, write two differences between the significance of mitosis and

meiosis. (2)

Significance of mitosis Significance of meiosis

b. Write down the differences between the following pairs- (3) i. Protoplasm and Cytoplasm

……… ……… ……… ……… .

ii. Cell wall and Cell membrane.

……… ……… ……… ……….. iii. Chromosomes and chromatin fibres.

……… ……… ……… ……… c. Write down one identifying feature each for the following stages of meiosis. [3]

i. Metaphase-I ……… ……….. ii. Telophase-I ……… ………. iii.Anaphase-II ……… ………. d. Write down two differences between an eukaryotic and prokaryotic cell. [2]

……… ……… ……… ……… ………

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MHSS/ BIO/MIDTERM 2019. Page 12 of 13 Question 6.

a. Study the figure given below and answer the questions that follows.

1. Explain the mechanism taking place in the above diagram. [2]

……… ……… ……… ……… ……… ……… ……… ……… 2. In the above figure, what is the osmotic pressure of the tissue fluid at the – [2]

i. Arterial end……….………

ii. Venous end………

3. Under what conditions the osmotic pressure in the tissue fluid increases? [1]

……… ……… 4. What is the nature of the blood carried by the followings [2]

i. Artery………..…..

ii. Veins……….

b. Define the following terms [3] 1. Oedema ……… ……… ……… ……… 2. Rhesus factor ……… ……… ……… ………..

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MHSS/ BIO/MIDTERM 2019. Page 13 of 13 3. Osmoregulation ……… ……… ……… …