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

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👉 Download Biology Question Paper PDF - SET 2

PART A: BOTANY

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

1) Which among the following is an example for flagellated protozoan?

a. Amoeba b. Paramoecium

c. Trypanosoma d. Plasmodium

✅ c) Trypanosoma

2) The type of inflorescence in which main axis continues to grow is ……………….

✅ Racemose inflorescence

3) A simple gaseous Plant Growth Regulator (PGR) is ..................

✅ Ethylene

4) Sometimes, a few epidermal cells, in the vicinity of the guard cells become specialised in their shape and size and are known as ……………….

✅ Subsidiary cells

5) Crossing over occurs in ............. substage of Prophase-I.

a. Leptotene b. Zygotene

c. Diplotene d. Pachytene

✅ d. Pachytene

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

6) Plants that are adapted to dry tropical regions have the C4 pathway. Write any two advantages of C4 plants over C3 plants.

✅ Answer

Tolerate high temperature, Lack of photorespiration, Kranz anatomy etc.

7) RuBisCO is the most abundant enzyme in the plant world. How does RuBisCO involve in photorespiration?

✅ Answer

Oxygen binds with RuBisCO and breaks RuBP into one molecule of phosphoglycerate and phosphoglycolate.

8) a) Bryophytes are called amphibians of plant kingdom. Give reason.

b) Mention any two divisions of bryophytes.

✅ Answer

a) Bryophytes live in moist soil and they need water for sexual reproduction.

b) Liverworts and mosses.

9) "There are several reasons why plants can get along without respiratory organs." Justify the above statement by citing two reasons.

✅ Answer

Each plant part takes care of its own gas exchange needs.

Plants do not have great demands for gas exchange.

10) Many plants show plasticity during their life span.

a. What is plasticity?

b. Give one example.

✅ Answer

(a) Plasticity is a phenomenon in which plants follow different pathways in response to environment or phases of life to perform different kind of structures.

(b) Phenomenon of heterophylly in cotton, coriander, larkspur, or buttercup.

11) Glycolysis is the breakdown of glucose into pyruvic acid.

a. Where does glycolysis occur in a cell?

b. Why is glycolysis a partial oxidation?

✅ Answer

(a) Cytoplasm

(b) Glucose undergoes partial oxidation to form two molecules of pyruvic acid.

12) Given below is the diagrammatic representation of a particular stage of mitosis:

a. Identify the stage.

b. Write any two features of this stage.

✅ Answer

(a) Anaphase

(b) Centromere split and chromatids separate. Chromatids move to opposite poles.

13) Draw the given flow chart in your answer sheet. Fill the blank columns.

✅ Answer

14) (a) Define Mycorrhiza.

(b) How is Mycorrhizal association helpful to plants?

✅ Answer

(a) Mycorrhiza is the symbiotic association of fungus and roots of higher plants.

(b) It helps plants for absorbing minerals from the soil.

15) Match the columns A and B.

✅ Answer

16) (a) Fill the blanks in the flowchart given below.

(b) Which organelle possesses hydrolytic enzymes?

✅ Answer

(a) Endoplasmic reticulum (ER), Golgi complex, Vacuoles.

(b) Lysosomes possesses hydrolytic enzymes.

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

17) Transport of electrons through ETS of the chloroplast results photophosphorylation. Write any three differences between cyclic and non-cyclic photo-phosphorylation.

✅ Answer

Non-cyclic photo-phosphorylation:

▪️ It occurs when the two photosystems work in a series (PS II and PS I).

▪️ ATP & NADPH + H+ are synthesised.

▪️ It is a non-cyclic process because the electrons lost by PS II do not come back to it but pass on to NADP+.

Cyclic photo-phosphorylation:

▪️ It occurs in stroma lamellae when only PS I is functional.

▪️ The electron is circulated within the photosystem and the ATP synthesis occurs due to cyclic flow of electrons.

▪️ Only ATP is synthesised.

18) The following are the anatomical features of flowering plants. Arrange these features in the table given below:

i. Exarch xylem

ii. Presence of hypodermis

iii. Palisade parenchyma cells

iv. Conjoint and open vascular bundles

v. Endodermis with casparian strips

vi. Large empty bulliform cells

✅ Answer

19) Observe the given floral diagram.

a. Identify the family.

b. Write down any two distinguishing features of gynoecium.

c. Write any two economically useful plants belonging to this family.

✅ Answer

(a) Solanaceae

(b) Gynoecium is bicarpellary obligately placed, syncarpous; ovary superior

20) An improved model of the structure of plasma membrane was proposed by Singer and Nicholson.

a. What is this model called?

b. Which component forms bilayer?

c. Briefly explain two types of proteins present in cell membrane.

✅ Answer

(a) Fluid mosaic model

(b) Lipids/Phosphoglycerides

Peripheral proteins: Lie on the surface of membrane.

PART B: ZOOLOGY

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

1) Unlike bony fishes, cartilage fishes are swim constantly to avoid sinking due to the

a. Presence of pharyngeal gill slits

b. Presence of air bladder

c. Absence of pharyngeal gill slits

d. Absence of air bladder

✅ d. Absence of air bladder.

2) Volume of air that will remain in the lungs after a normal expiration is called ……………….

✅ Functional Residual Capacity (FRC)

3) Expand ICBN.

✅ International Code of Botanical Nomenclature.

4) Structure of Malpighian body (renal corpuscle) is shown below. Label A and B.

✅ A= Afferent arteriole B= Efferent arteriole

5) Which of the part of brain control respiration and gastric secretions?

a. Cerebrum b. Medulla

c. Cerebellum d. Hypothalamus

✅ b. Medulla

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

6) Major steps involved in muscle contraction are given below, which are not in the correct order. Arrange them in the correct order.

a. Remove the mask of active sites for binding myosin
↓
b. A signal sent out by CNS
↓
c. Binding of Ca²⁺ with troponin
↓
d. Release of a neuro-transmitter substance
↓
e. Release of Ca²⁺ into the sarcoplasm

✅ Answer

a. A signal sent out by CNS
↓
b. Release of a neuro-transmitter substance
↓
c. Release of Ca²⁺ into the sarcoplasm
↓
d. Binding of Ca²⁺ with troponin
↓
e. Remove the mask of active sites for binding myosin

7) (a) Name the largest phylum of Animal kingdom.

(b) Mention any three distinguishing features of this phylum.

✅ Answer

(a) Arthropoda

(b) Chitinous exoskeleton. Body consists of head, thorax and abdomen. They have jointed appendages.

8) List the major factors affecting the dissociation of oxygen from oxyhaemoglobin in the tissues.

✅ Answer

Low PO2, high PCO2, high H⁺, high temperature.

9) Given below are some structures present in frog. Odd one out. Justify your answer.

Common bile duct, conus arteriosus, oesophagus, microvilli

✅ Answer

Conus arteriosus. Because it is a part of frog’s circulatory system. Others belong to digestive system.

10) State whether the following statements are true/false. If false, correct it.

a. ADH prevents diuresis.

b. ANF causes the increase of blood pressure.

c. Angiotensin-l activate adrenal cortex to release aldosterone.

d. Aldosterone causes the reabsorption of Na+ and water from the distal part of renal tubule.

✅ Answer

(a) True

(b) False. ANF decreases blood pressure.

(d) True.

11) Name of the bones of appendicular skeleton are given below:

Clavicle, Humerus, Tibia, Patella

a. Select the bones of pectoral girdle.

b. Name the articulating cavity between femur and pelvic girdle.

✅ Answer

(a) Clavicle, Scapula.

(b) Acetabulum.

12) The following are organs of certain animals:

Parapodia, Flame cells, Proboscis gland, Comb plates

a. Select organs helps in excretion.

b. Name the organism bearing these organs and its phylum.

✅ Answer

(a) Flame cells, Proboscis gland

(b) Flame cells: Phylum Platyhelminthes. E.g. Liver fluke

Proboscis gland: Phylum Hemichordata. E.g. Balanoglossus.

13) General structure of amino acid is given. Draw the structure of the amino acids, (a) glycine and (b) Serine.

✅ Answer

14) Distinguish between the following:

a. Electrical synapse and Chemical synapse

b. Bipolar and multipolar neurons.

✅ Answer

(a) Electrical synapse: The membranes of pre- and post-synaptic neurons are nearer. Faster impulse transmission.

Chemical synapse: There is a fluid filled space (synaptic cleft) between the presynaptic neuron and postsynaptic neuron.

(b) Bipolar neurons have one axon and one dendrite.

Multipolar neurons have one axon and two or more dendrites.

15) Identify the picture and label the parts A, B, C, D.

✅ Answer

Hypothalamus and pituitary.

A= Hypothalamus

B= Posterior pituitary

C= Anterior pituitary

D= Portal circulation

16) (a) Make a flowchart showing cardiac impulse conduction using appropriate terms given in bracket.

[SAN, Right atrium, AVN, AV Bundle, Bundle of His, Ventricle]

(b) Which part known as pacemaker?

✅ Answer

(a) SAN → Right atrium → AVN → AV Bundle → Bundle of His → Ventricle.

(b) SA node (SAN)

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

17) Complete the Schematic diagram.

✅ Answer

A= Tissue/organ/organ system

B= Bilateral

C= Pseudocoelom

D= Ctenophora

E= Mollusca

F= Hemichordata

18) Following are the hormones produced by tissues other than endocrine glands. Write the part where it is produced and mention the function of each.

a. Cholecystokinin b. Gastrin c. Secretin

✅ Answer

(a) Cholecystokinin: From gastro-intestinal tract. Function: Stimulates secretion of pancreatic juice.

(b) Gastrin: From gastro-intestinal tract. Function: Stimulates secretion of HCl in gastric glands.

(c) Secretin: From gastro-intestinal tract. Function: Stimulates secretion of water and bicarbonate ions.

19) Match the following:

✅ Answer

20) Blood coagulation is a mechanism to prevent the excessive loss of blood. Draw a flowchart showing the various events in blood coagulation.

✅ Answer

Clumped platelets & tissues release thromboplastin → It forms thrombokinase (Prothrombinase) enzyme → Thrombokinase hydrolyses prothrombin to thrombin enzyme in presence of Ca²⁺ → Thrombin converts soluble fibrinogen to insoluble fibrin → Fibrin threads trap dead & damaged blood cells to form clot (coagulum).

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Plus One Biology (Bot + Zoo) | Practice Model Question Paper PDF with Answer key | SET 2