Kerala Plus One Botany Question Paper March 2023 with Answers

Teachers recommend solving Kerala Syllabus Plus One Botany Previous Year Question Papers and Answers Pdf March 2023 to improve time management during exams.

Kerala Plus One Botany Previous Year Question Paper March 2023

I. Answer any three questions from 1-5. Each carries 1 score. (3 × 1 = 3)

Question 1.
Fill in the blank:
The algal component in lichen is known as _____
Answer:
Phycobiont

Question 2.
Choose the correct answer:
The R.Q (Respiratory Quotient) of carbo-hydrate is ______ .
Answer:
1

Question 3.
Observe the relationship of first pair and fill in the blank:
Algin : Brown algae
Carrageen : _______
Answer:
Red algae

Question 4.
Name the type of vascular bundle in the figure:

Answer:
Radial vascular bundle

Question 5.
Fill in the blank:
The site of dark reaction in photosynthesis is _____ part of chloroplast.
Answer:
Stroma

II. Answer any 9 questions from 6-16. Each carries 2 scores.

Question 6.
Expand the following:
(A) PPLO
(B) SER
Answer:
(A) Pleuro Pneumonia Like Organism
(B) Smooth Endoplasmic Reticulum

Question 7.
Observe the diagram given below:
(i) Identify this bryophyte.
(ii) Label the parts A, B and C

Answer:

1. Funaria
2. A – Rhizoid B – Seta C – Capsule

Question 8.
Match the following:

A	B
Amoeboid Protozoans	Paramoecium
Flagellated Protozoans	Entamoeba
Ciliated Protozoans	Plasmodium
Sporozoans	Trypanosoma

Answer:

A	B
Amoeboid Protozoans	Entamoeba
Flagellated Protozoans	Trypanosoma
Ciliated Protozoans	Paramoecium
Sporozoans	Plasmodium

Question 9.
Fill in the blanks with appropriate term given below: Chloroplast, Amyloplasts, Lencoplast, Aleuroplast.

Answer:
A – Chloroplast
B – Leucoplast
C – Amyloplast
D – Aleuroplast

Question 10.
Karyokinesis in Mitosis involves four stages. What are they?
Answer:
Prophase, Metaphase, Anaphase, Telophase

Question 11.
The following figure A & B show two different types of phyllotaxy:
(i) Define phyllotaxy.
(ii) Write the name of phyllotaxy A & B

Answer:

1. Arrangement of leaves on stem or branch.
2. A – Alternate,
   B – Opposite

Question 12.
Write any two uses of Ethephon.
Answer:

1. Promote abscission in flowers and fruits.
2. Promote female flowers in cucumbers and thus increase the yield.

Question 13.
The first step in respiration is glycolysis.
(A) Define glycolysis.
(B) Write the site of glycolysis in a cell.
(C) Enzyme responsible for conversion of glucose to glucose -6-phosphate.
Answer:
(A)It is the partial oxidation of glucose into two molecules of Pyruvic acid.
(B) Cytoplasm
(C) Hexokinase

Question 14.
Certain physiological effects in plants are given below: Name the plant growth regulators responsible for it.
(A) Bolting
(B) Apical dominance
(C) Ripening of fruit
(D) Closure of stomata
Answer:
(A) Gibberellin
(B) Auxin
(C) Ethylene
(D) Abscisic acid

Question 15.
Identify the sub stages of prophase I of Meiosis in which the following events take place:
(A) Crossing over
(B) Pairing of homologous chromosome
(C) Terminalisation of Chiasmata
(D) Dissolution of synaptonemal complex.
Answer:
(A) Pachytene
(B) Zygotene
(C) Diakinesis
(D) Diplotene

Question 16.
Some characteristic features of C₃ and C₄ plants are given below:
• Kranz anatomy absent
• Lack photorespiration
• First product of CO₂
• Primary CO₂ acceptor is PEP.

Arrange them as follows:
C₃ Plants:
C₄ Plants:
Answer:
C₃ Plants : Kranz anatomy absent, First product of CO₂ fixation is PGA

C₄ Plants: Lack Photorespiration , Primary CO₂ acceptor is PEP

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

Question 17.
The given figure shows different types of flowers based on position of floral parts on thalamus:
Answer:
(i) Identify (A) & (B).
(ii) Explain Epigynous flower.

(ii) Margin of thalamus grows upward enclosing the ovary completely and other parts arise above the ovary.

Question 18.
Write any 3 external and internal features that affect photosynthesis.
Answer:

Internal factors	External factors
1. Number of leaf	1. Light
2. Age of leaf	2. Carbon dioxide concentration
3. Internal CO2 concentration	3. Temperature /Water

Question 19.
The following are the anatomical features of flowering plants. Arrange these features in the table given below:
• Spongy parenchyma
• Hypodermis present
• Exarch xylem
• Conjoint and open vascular bundle
• Large empty bulliform cells
• Endodermis with casparian strip
Answer:

1. Root : Exarch xylem , Endodermis with casparian strip
2. Stem : Hypodermis present, Conjoint and Open vascular bundle
3. Leaf : Spongy parenchyma , Large empty bullifoTm cells

Question 20.
Observe the figure given below and answer the following questions.

(i) Write the name of this cycle.
(ii) Identify A & B in the cycle.
Answer:
(i) Krebs’ cycle/ TCA cycle

(ii) A – Oxalo acetic acid
B – Citric acid