Plus One Biology (Bot + Zoo) | Practice Model Question Paper PDF with Answer key | SET 1

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I. Answer any 3 questions from 1 – 5. Each carries 1 score. (3 x 1 = 3)

1) The organelle known as power house of the cell is

a. Ribosome                   b. Vacuole

c. Mitochondrion          d. Chloroplast

✅ (c) Mitochondrion

2) Casparian strips are present in

a. Dicot root          b. Dicot stem

c. Dicot leaf          d. Monocot stem

✅ (a) Dicot root

3) In lichen, the algal component is known as ………(a) ………. and fungal component as ………(b) ……….

✅ (a) phycobiont           (b) mycobiont

4) Observe the relationship between the first two terms and fill in the blank.

Metaphase: Spindle fibres attach to kinetochores.

......................: Chromatids move to opposite poles.

✅ Anaphase

5) Fill in the blank. The number of carbon atoms in acetyl co-enzyme A, which take part in Krebs’ cycle is ..............

✅ 2

II. Answer any 9 questions from 6 – 16. Each carries 2 scores. (9 x 2 = 18)

6) R.H. Whittaker proposed Five-Kingdom classification based on certain criteria. Mention any four of them.


• Cell structure - Prokaryotes or Eukaryotes

• Thallus organisation - Unicellular or Multicellular

• Mode of nutrition - Autotrophic or Heterotrophic

• Phylogenetic relationships

7) Analyse the table given below and fill in the blanks.


     (a) Synapsis

     (b) Pachytene

     (c) Diplotene

     (d) Terminalization of chiasmata.

8) Algae are economically very important for human. Justify this statement giving any four examples.


a) Agar obtained from Gelidium and Gracillaria are used as tissue culture medium.

b) Spirulina are used as food supplement for space travelers.

c) Laminaria and Sargassum are used as food.

d) Algin (brown algae) and carrageen (red algae) produce hydrocolloids (water holding substances).

9) Peculiarities of certain cell organelles are given below:

a. Involved in protein synthesis.

b. Made up of many flat, disc shaped sacs or cisternae.

c. Bear ribosomes on their surface.

d. Rich in hydrolytic enzymes.

e. Membrane is absent.

Copy the table given below and write the above peculiarities in appropriate column.


10) Analyse the table given below and fill in the blanks a, b, c, d.


(a) Non-cyclic

(b) 1

(c) 2

(d) Absent

11) The first step in respiration is glycolysis.

a. Define glycolysis.

b. Write the site of glycolysis.


(a) Glycolysis is the breakdown of glucose in to pyruvic acid.

(b) Cytoplasm.

12) Aerobic respiration and anaerobic respiration are two types of respiration.

a. What is anaerobic respiration?

b. Write the change that occurs to pyruvic acid in yeast cells.


(a) Anaerobic respiration is the incomplete oxidation of glucose in the absence of oxygen.

(b) Pyruvic acid is converted to ethanol and CO2.

13) Notice the three stages of Calvin cycle given below:

Reduction, Regeneration, Carboxylation

a. Arrange the above stages in correct order.

b. Calvin cycle is also known as C3 cycle (Pathway). Give reason.


(a) Carboxylation, Reduction, Regeneration.

(b) First stable product is a C3 compound (3-PGA).

14) Match the items of column A with B.


15) (a) Name the two scientists who formulated Cell theory.

(b) Write the two main points in cell theory.


(a) Schleiden and Schwann

(b) ▪️ All living organisms are composed of cells and product of cells.

▪️ All cells arise from pre-existing cells.

16) Observe the figures A and B given below:
a. Name the type of venation in A and B.

b. Define venation.


(a) A= Reticulate venation,

     B= Parallel venation.

(b) It is the arrangement of veins and veinlets in the leaf lamina

III. Answer any 3 questions from 17 – 20. Each carries 3 scores. (3 x 3 = 9)

17) Observe the given figure showing C4 pathway.
a. Identify the cells A and B.

b. Name the C4 acid formed through this pathway.

c. Name the enzyme involved in the formation of C4 acid.


(a) A= Mesophyll Cell,

     B= Bundle sheath cell

(b) OAA/ Malic acid / Aspartic acid

(c) PEP carboxylase (PEP case)

18) Observe the figures A and B.
a. Identify the aestivation A and B.

b. Write one peculiarity of A.

c. Name the three kinds of petals in B.


(a) A= Twisted, B. Vexillary/ Papilionaceous

(b) One margin of each member overlap that of the next one.

(c) Standard petal, wing petals, keel petal (anterior small petal).

19) The plant growth regulators are divided into growth promoters and growth inhibitors.

a. Name the three hormones, which are known as plant growth promoters.

b. Name the growth inhibitor which is known as ' stress hormone'.

c. Write any two roles of the above identified stress hormone.


(a) Auxin, Cytokinin, Gibberellin.     

(b) Abscisic acid (ABA)

     (c) ▪️ Inhibit seed germination.

          ▪️ Helps to withstand desiccation.

20) Observe the figure given below. Write any three features on mesophyll cells from the figure.


▪️ Present between upper and lower epidermis.

▪️ Made up of parenchyma cells.

▪️ Divided in to palisade and spongy parenchyma.


I. Answer any 3 questions from 1 – 5. Each carries 1 score. (3 x 1 = 3)

1) Select the enzyme that facilitate the following reaction:

a. Succinic dehydrogenase          b. RuBiSCO

c. Carbonic anhydrase                   d. Lipase

✅ (c) Carbonic anhydrase

2) Which among the following is a primary metabolite?

Alkaloids, Antibiotics, Amino acids, Flavonoids

✅ Amino acids

3) Name the portion of the myofibril between two successive Z-lines.

a. H-zone          b. Sarcomere

c. I-band          d. M-line

✅ (b) Sarcomere

4) Identify the word pair applicable to phylum Ctenophora.

     a. Nephridia, Parapodia

     b. Comb plates, Bioluminescence

     c. Polyp, Metagenesis

     d. Radula, Visceral hump

✅ (b) Comb plates, Bioluminescence

5) Unit of classification is

a. Taxon          b. Species

c. Genus          d. Cell

✅ (a) Taxon

II. Answer any 9 questions from 6 – 16. Each carries 2 scores. (9 x 2 = 18)

6) Cells of human body perform different types of movement. Write any two types of movement and the parts that exhibit the movement.


Amoeboid movement: E.g. Macrophages & leucocytes.

Ciliary movement: E.g. ciliary movements in trachea.

7) Find out the suitable term from the box for the disorders stated.

i. Accumulation of Urea in blood.

ii. Insoluble mass of crystallised salts in the kidney.

iii. Surgical method for the correction of Renal failures.

iv. Inflammation of glomeruli of kidney.

Dialysis, Kidney transplantation, Glomerulonephritis, Uremia, Renal Calculi


i. Uraemia

ii. Renal calculi

iii. Kidney transplantation

iv. Glomerulonephritis

8) Characteristics of certain animals are given. Arrange them under the Class to which these animals belong.

i. Skin is moist without scales.

ii. Body is covered by dry and cornified skin.

iii. Shed the scales as skin cast.

iv. Can live in aquatic as well as terrestrial habitats.


Class Amphibia: (i) & (iv)

Class Reptilia: (ii) & (iii)

9) When substrate concentration increases, the velocity of enzymatic reaction increases at first. After attaining a maximum velocity, it cannot be exceeded by further addition of substrates. Why?


Because enzyme molecules are fewer than the substrate molecules i.e. No free enzyme molecules to bind with additional substrate molecules.
10) Distinguish between non-Chordata and Chordata. (Any two differences).


Chordata: Notochord is present, Pharyngeal gill slits are present.

Non-Chordata: Notochord is absent, Pharyngeal gill slits are absent.

11) Distinguish between the following terms:


b. Tidal volume, Residual volume


(a) IRV: Additional volume of air a person can inspire by a forcible inspiration.

ERV: Additional volume of air a person can expire by a forcible expiration.

(b) Tidal Volume: Vole of air inspired or expired during normal respiration.

Residual volume: Volume of air remaining in the lungs after a forcible expiration.

12) Give one word for the following:

(i) The nucleic acid that behave like enzymes.

(ii) The protein part of the enzyme.

(iii) The organic compound tightly bound to the apoenzyme.

(iv) The organic compound that are loosely bound to the apoenzyme.


(i) Ribozymes

(ii) Apoenzyme

(iii) Prosthetic group

(iv) Coenzymes

13) ANF is a regulatory mechanism in kidney functioning.

(a) Expand ANF.

(b) Which part of the body secrete ANF?

(c) Explain the regulatory mechanism.


(a) Atrial Natriuretic Factor

(b) Atria of the heart

(c) ANF is released when blood flow to the atria is increased. It causes vasodilation (dilation of blood vessels) to decrease the blood pressure.

14) 'Adrenal medulla is the centrally located tissue in the adrenal gland, whereas adrenal cortex is located outside.

How do adrenal cortex and medulla differ in their function?


Adrenal cortex: Secretes corticoid hormones for carbohydrate metabolism etc.

Adrenal medulla: Secretes adrenaline and noradrenaline (emergency hormones).

15) a) Draw a flowchart showing the correct sequence of various parts of frog’s alimentary canal.

b) Name the location of finger-like villi and microvilli and mention their function.


a) Mouth → buccal cavity → pharynx → oesophagus → stomach → intestine → rectum → cloaca.

b) Intestine. They absorb digested food.

16) Name any two plasma proteins and state their functions.


Fibrinogen: For blood coagulation.

Globulins: Act as antibodies.

Albumins: For osmotic balance. Regulate blood pressure.

III. Answer any 3 questions from 17 – 20. Each carries 3 scores. (3 x 3 = 9)

17) Observe the diagram.
a. What does it denote?

b. What do P, QRS, T represent?

c. What is its clinical significance?


(a) ECG.

(b) P wave: Depolarization of atria.

QRS wave: Depolarization of ventricles.

T-wave: Repolarization of ventricles.

(c) It is used to find out the deviation or abnormality of functioning of heart.

18) Compete the given table appropriately.


(A) Testis

(B) Thymosin

(C) Provides immunity.

(D) Pancreas

(E) Melatonin

(F) Diurnal rhythm.

19) Observe the figures.
a. Identify the organisms A, B & C.

b. Name the phylum to which each of them belongs.


(a) A= Balanoglossus, B= Neries, C= Liver fluke (Fasciola).

(b) A= Hemichordata, B= Annelida, C= Platyhelminthes.

20) Match the following:


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