Plus One Biology (Bot + Zoo) | Practice Model Question Paper PDF with Answer key | SET 7

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PART A: BOTANY

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

01) Who among the following scientists is related with the identification of cytokinins?

a) E. Kurosawa

b) F. Skoog

c) C. Darwin

d) F.W. Went

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✅ b) F. Skoog

02) The C4 pathway is also known as ………………

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✅ Hatch and Slack pathway

03) Genera like Selaginella and Salvinia which produce two kinds of spores, macro (large) and micro (small) spores, are known as ………………

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✅ Heterosporous

04) Bacteria can be classified into two groups on the basis of the differences in the cell envelopes and the manner in which they respond to the staining procedure developed by Gram. They are ………………. and ……………….

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✅ Gram positive and Gram negative

05) Note the relationship between first two terms and fill the fourth place.

Nuclear division: karyokinesis

Division of cytoplasm: ……………….

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✅ Cytokinesis

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

06) Algae are useful to man in a variety of ways. Suggest any four uses of algae.

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✅ Answer

▪️ Algae help in CO2 fixation by photosynthesis.

▪️ Increase level of oxygen.

▪️ Primary producers of ocean.

▪️ Used as food.

07) Read the following statements and state true or false. Also the correct the wrong statements.

i) Methanogens are present in the guts of ruminant animals.

ii) Mycoplasma has distinct cell wall.

iii) Viroids are infectious naked DNA molecules.

iv) Algal component of lichen is phycobiont.

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✅ Answer

i) True.

ii) False. Mycoplasma does not have a distinct cell wall.

iii) False. Viroids are infectious naked RNA molecules.

iv) True.

08) An important difference between C3 & C4 plants is photorespiration. Explain how photorespiration occurs in C3 plants.

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✅ Answer

In C3 plants some O2 bind to RuBisCO. Hence CO2 fixation is decreased. Here RuBP binds with O2 to form one molecule of phosphoglycerate and phosphoglycolate. This pathway is called photorespiration. In this pathway, there is no synthesis of sugars, ATP and NADPH. Hence photorespiration is a wasteful process. Rather it causes the release of CO2 by using ATP.

09) Write any four agricultural applications of ethylene.

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✅ Answer

Agricultural applications of ethylene:

▪️ Influences horizontal growth of seedlings, swelling of the axis and apical hook formation in dicot seedlings.

▪️ Promotes senescence and abscission of plant organs especially of leaves and flowers.

▪️ Promotes fruit ripening.

▪️ Breaks seed and bud dormancy, initiates germination in peanut seeds, sprouting of potato tubers.

10) Define Blackman's law of limiting factors and identify any two important factors which influence the rate of photosynthesis in plants.

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✅ Answer

Blackman's law of limiting factors: “If a biochemical process is affected by more than one factor, its rate is determined by the factor nearest to its minimal value: it is the factor which directly affects the process if its quantity is changed.”

Factors: Sunlight, temperature, CO2 concentration and water.

11) Given below is a diagram showing parts of a fruit. Label A, B, C and D.

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✅ Answer

A= Epicarp, B= Mesocarp, C= Seed, D= Endocarp.

12) How can you differentiate an actinomorphic flower from a zygomorphic flower?

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✅ Answer

▪️ Actinomorphic: Flower can be divided into 2 equal radial halves in any radial plane passing through centre.

▪️ Zygomorphic: Flower can be divided into two similar halves only in one particular vertical plane.

13) In an anatomy lab, Ramu and Salim were taking transverse sections (T.S) of two specimens, A and B respectively. Complete the table.

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✅ Answer

14) Given below is a Summary equation of Krebs’ cycle. Complete it.

Pyruvic acid + 4NAD⁺ + FAD⁺ + 2H2O + ADP + Pi → ...

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✅ Answer

3CO2 + 4NADH + 4H+ + FADH2 + ATP

15) Removal of terminal buds is a usual practice in tea plantation. Explain the reason.

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✅ Answer

Growing apical bud inhibits the growth of lateral buds (Apical dominance). Removal of shoot tips (decapitation) allows lateral buds to grow, making tea plants bushier.

16) The tissue between the upper and lower epidermis in dorsi- ventral leaf is called mesophyll tissue.

(a) Name the two types of cells seen in mesophyll tissue.

(b) What is the function of mesophyll tissue?

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✅ Answer

(a) Palisade mesophyll and Spongy mesophyll

(b) They are the primary site for photosynthesis.

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

17) a) Identify a cell organelle which contains hydrolytic enzymes.

b) Rough Endoplasmic Reticulum (RER) and Smooth Endoplasmic Reticulum (SER) are morphologically and functionally different. Justify.

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✅ Answer

a) Lysosome.

b) RER has ribosomes and is involved in protein synthesis. SER lacks ribosomes and is the site for lipid synthesis.

18) Given below is the metaphase of mitosis. Analyze the diagram and draw a sketch of anaphase. Write any two events.

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✅ Answer

• Centromeres split and chromatids separate.

• Chromatids move to opposite poles.

19) According to Chemiosmotic hypothesis, breakdown of proton gradient leads to synthesis of ATP. Explain the two parts of ATP synthase.

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✅ Answer

a) CF0: Trans-membrane channel for facilitated diffusion of protons.

b) CF1: Protrudes on the outer surface; energy from proton flow causes conformational changes to synthesize ATP.

20) Glycolysis: Fill up the blank boxes.

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✅ Answer

A–glucose 6-phosphate

B–fructose 6-phosphate

C–fructose 1,6-diphosphate

D–1,3-bisphosphoglyceric acid

E–2 phosphoglyceric acid

F–Phosphoenol pyruvic acid

PART B: ZOOLOGY

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

01) Potato, nightshade & brinjal are species of genus ……………….

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✅ Solanum

02) Cerebral hemispheres of human brain are connected by ...................

i) association area

ii) corpus callosum

iii) corpora quadrigemina

iv) pons varolii

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✅ ii) corpus callosum

03) Among the different phyla of animals ....................... have pseudocoelom.

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✅ Aschelminthes (Roundworms)

04) Select the wrongly matched pair:

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✅ Antibody – Sensory receptor

05) In human body, 97% of oxygen is transported through blood as ……………….

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✅ Oxyhemoglobin

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

06) Name any two features of frog’s circulatory system not seen in humans.

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✅ Answer

▪️ Three-chambered heart.

▪️ Sinus venosus and conus arteriosus present.

▪️ Nucleated RBCs.

07) Categorize under radial and bilateral symmetry: Physalia, Tapeworm, Fasciola, Adamsia.

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✅ Answer

Radial: Physalia, Adamsia.

Bilateral: Tapeworm, Fasciola.

08) Snail and Octopus: a) Name the phylum. b) Give three common features.

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✅ Answer

(a) Mollusca.

(b) Visceral mass, Mantle cavity, Radula.

09) Identify the given biomolecules.

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✅ Answer

A= Adenylic acid

B= Cholesterol

C= Ribose

D= Uracil

10) a) Complete the chart. b) Expand HMM and LMM.

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✅ Answer

(a) A–Meromyosin, B–LMM.

(b) HMM: Heavy meromyosin, LMM: Light meromyosin.

11) Observe the diagram and label A, B, C and D.

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✅ Answer

A–Axonite, B–Synaptic vesicle, C–Synaptic cleft, D–Neurotransmitter

12) Inspiration vs Expiration.

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✅ Answer

13) Match animals and excretory organs.

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✅ Answer

14) Name the four Structural levels of protein.

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✅ Answer

Primary, secondary, tertiary and quaternary structure.

15) State true or false: a) Tissue fluid from blood. b) Mineral distribution. c) Drains to arteries. d) Lymph contains lymphocytes.

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✅ Answer

(a) True. (b) False (Same distribution). (c) False (Drains to veins). (d) True.

16) Distinguish between true ribs and false ribs.

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✅ Answer

True ribs: First 7 pairs; connected directly to sternum.

False ribs: 8th, 9th, 10th pairs; join the 7th rib instead of sternum.

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

17) Identify phylum/class: a) Scales, 3/4 chambered heart. b) Bioluminescence. c) Proboscis gland.

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✅ Answer

a) Reptilia (e.g. Crocodiles). b) Ctenophora (e.g. Ctenoplana). c) Hemichordata (e.g. Balanoglossus).

18) Counter current system: a) Two regions. b) Definition. c) Responsible solutes.

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✅ Answer

(a) Henle’s loop & vasa recta. (b) Flow in opposite directions in adjacent limbs. (c) NaCl & urea.

19) Complete the table.

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✅ Answer

A= ANF

B= Pancreas

C= Lowers glucose

D= Kidney

E= Erythropoiesis

F= Thymosin

20) Label A to F.

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✅ Answer

A= Vena cava

B= Chordae tendineae

C= Aorta

D= Pulmonary artery

E= Bundle of His

F= Interventricular septum

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