Teachers recommend solving Kerala Syllabus Plus One Botany Previous Year Question Papers and Answers Pdf Board Model Paper 2023 to improve time management during exams.
Kerala Plus One Botany Board Model Paper 2023 with Answers
I. Answer any three questions from 1-5. Each carries 1 score. (3 × 1 = 3)
Question 1.
Observe the relationship between the first two terms and fill in the blank.
Mushroom : Agaricus
Bread mould : ________
Answer:
Rhizopus
Question 2.
All the tissues on the inner side of endodermis together constitute ______
Answer:
Stele
Question 3.
Complete oxidation of organic substance in the presence of oxygen is ______
Answer:
Aerobic respiration
Question 4.
Observe the figure given below. It shows two phases in the life cycle of Funaria. Identify and write the phase marked as ‘A’.
Answer:
Sporophytic stage
Question 5.
Name the enzyme present in plants which shows carboxylation and oxygenation activity.
Answer:
RuBisCO
II. Answer any 9 questions from 6-16. Each carries 2 scores. (9 × 2 = 18)
Question 6.
Diatoms, the chief producers in the ocean are useful in many ways. Evaluate the statement.
Answer:
Cell wall remains of diatoms in ocean floor is called Diatomaceous earth if is used in polishing, filtration of oils and syrups.
Question 7.
An important model of the structure of plasma membrance was proposed by Singer and Nicolson.
(a) What is this model called?
(b) Which component forms bilayer?
(c) Identify and write the two types of proteins present in plasma membrane.
Answer:
(a) Fluid mosaic model.
(b) Phospholipids.
(c) Integral protein and peripheral protein
Question 8.
Observe the following phases of nuclear divisions during mitosis and answer the following questions.
(a) Name the two phase ‘A’ and ‘B’
(b) What are the main events occurring in ‘A’ phase?
Answer:
(a) A- Anaphase.
B – Telophase.
(b) • Centromeres split and chromatids separate.
• Chromatids move to opposite poles of the cell
Question 9.
Give the scientific term for the following.
(a) Pairing of homologous chromosomes.
(b) Echange of genetic material between two homologous chromosomes.
Answer:
(a) Synapsis.
(b) Crossing over.
Question 10.
Match the following:
| A | B |
| Prothallus | Mosses |
| Coralloid roots | Gametophyte |
| Floridean starch | Cycas |
| Protonema | Red algae |
Answer:
| A | B |
| Prothallus | Gametophyte |
| Coralloid roots | Cycas |
| Floridean starch | Red algae |
| Protonema | Mosses |
Question 11.
Rough Endoplasmic Reticulum (RER) and Smooth endoplasmic Reticulum (SER) are morphologically and functionally different. Justify this statement.
Answer:
| A | B |
| Endoplasmic reticulum bearing ribosomes on their surface is called RER. | Endoplasmic reticulum devoid of ribosomes on their surface is called SER. |
| RER is involved in protein synthesis and secretion | SER is involved in synthesis of lipids and steroid hormones |
Question 12.
Observe the given graph. The graph represents the phases of growth.
(a) Name the growth curve.
(b) Name the different phases of growth represented as (a), (b) and (c).
Answer:
a) Geometrical growth curve
b) (a) Lag phase.
(b) Log or.exponential phase.
(c) Stationary phase
Question 13.
Fermentation is the incomplete oxidation of pyruvic acid. Find the difference between two types of fermentation in microorganisms.
Answer:
| Alcoholic fermentation | Lactic acid fermentation |
| The product formed are CO2 and ethyl alcohol. | The product formed is Lactic acid |
| Alcoholic fermentation is carried out by Yeast. | Shown by Lactobacillus bacteria and Muscle cells. |
Question 14.
Observe the following diagram a, b, c, d identify the placentation.
Answer:
(a) Marginal placentation.
(b) Axile placentation.
(c) Parietal placentation.
(d) Free central placentation.
Question 15.
Choose the appropriate function from the bracket and fill the blank against each plant hormone in the table. (Ripening of fruits, Increase the length of stem in sugarcane, Induce parthenocarpy, Helps to overcome apical dominance)
| Plant hormone | Function of hormone |
| Auxin | |
| Gibberellins | |
| Cytokinin | |
| Ethylene |
Answer:
| Plant hormone | Function of hormone |
| Auxin | Induce parthenocarpy |
| Gibberellins | Increase the length of stem in sugarcane |
| Cytokinin | Helps to overcome apical dominance |
| Ethylene | Ripening of fruits |
Question 16.
(a) Which is the special leaf anatomy seen in C4 plants?
(b) Productivity and yield are better in C4 plants than C3 plants. Why?
Answer:
(a) Kranz anatomy
(b) They lack a process called photo-respiration.
They can fix CO2 in low atmospheric CO2 concentration.
They can tolerate higher temperature conditions
III. Answer any 3 questions from 17-20. Each carries 3 scores. (3 × 3 = 9)
Question 17.
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
iv) Conjoint and open vascular bundle
v) Endodermis with casparian strips
vi) Large empty bulliform cells
| Stem | Root | Leaf |
| Presence of hypodermis | Exarch xylem | Palisade parenchyma |
| Conjoint open bundle | Endodermis with casparian strips | Large empty bulliform cells |
Question 18.
Observe the figure ‘A’ and ‘B’ and answer the questions.
Img- 1
(a) Define venation.
(b) Name and explain the type of venation in ‘A’ and ‘B’.
Answer:
(a) The arrangement of veins and veinlet in the leaf lamina is called venation.
(b) A’ – Reticulate Venation: Vein and veinlet form a network on leaf lamina. eg. dicotyledonous plants.
‘B’- Parallel Venation: Vein and veinlet run parallel to each other on leaf lamina. eg. monocotytedonous plants.
Question 19.
Photophosphorylation takes place during photosynthesis.
(a) Name the two types of photophos-phorylations.
(b) Mention the differences between them.
Answer:
(a) Cyclic Photophosphorylation Non cyclic Photophosphorylation
(b)
| Cyclic photo – phosphorylation | Non-cyclic photo-phosphorylation |
| Electrons are transported in cyclic manner | Electrons are „ transported in non- cyclic manner. |
| Only PS -I is involved | Both PS-I and PS-II are involved |
| Only ATP is produced | Both ATP and NADPH+H* are produced. |
| Photolysis of water is absent | Photolysis of water is present |
| Oxygen is not liberated | Oxygen is liberated |
Question 20.
Glycolysis is the partial oxidation of glucose to produce 2 molecules of pyruvic acid
(a) Where does glycolysis occur?
(b) Steps of glycolysis are given below. Write the name of compounds marked as (a), (b), (c) and (d).
Answer:
(a) Cytoplasm
(b) (a) Fructose-6-phosphate
(b) 3-phosphoglyceric acid
(c) Phosphoenolpyruvate
(d) Pyruvic acid