Kerala Plus One Botany Question Paper March 2020 with Answers

Teachers recommend solving Kerala Syllabus Plus One Botany Previous Year Question Papers and Answers Pdf March 2020 to improve time management during exams.

Kerala Plus One Botany Previous Year Question Paper March 2020

Part – A

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

Question 1.
Choose the correct answer. The organelle known as power house of the cell is :
a) Ribosome
b) Vacuole
Answer:
Mitochondria

Question 2.
Choose the correct answer
Caspanan strips are present in:
a) Dicot root
b) Dicot stem
c) Dicot leaf
d) Monocot stem
Answer:
Dicot root

Question 3.
Observe the figure given below. Name the Organism.

Answer:
Euglena

Question 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
Answer:
Anaphase

Question 5.
Fill in the blank.
The number of carbon atoms in acetyl co-enzyme A, which take part in Kreb’s cycle is ______ .
Answer:
2

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

Question 6.
Observe the figure given below:

a) Name the process.
b) Define the above identified process.
Answer:
a) Facilitated diffusion
b) In facilitated diffusion, special membrane proteins help the movement of substances across membranes without expenditure of ATP or energy

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

A	B
Zygotene	(a)
(b)	Crossing over
(c)	Dissolution of synaptonemal complex
Diakinesis	(d)

Answer:
a) Pairing of homologous chromosomes
b) Pachytene
c) Diplotene
d) Terminalisation of Chiasmata

Question 8.
Define hydroponics. Write one advantage of it.
Answer:
This technique of growing plants in a nutrient solution is known as hydroponlbs. In this method essential elements are used and their deficiency symptoms can be studied.

Question 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 ensymes.
e) Membrane is absent

Copy the table given below and write the above pecularitie column.

Lysosome	Golgi apparatus	Ribosome

Answer:

Lysosome	Golgi apparatus	Ribosome
d) Rich in hydrolytic enzymes Golgi apparatus	b)Made up of many flat disc	a) Involved in protein synthesis e) Membrane is Absent

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

Processes	Cyclic photo phosporylation	Non-cyclic phtotopho sphorylat ion
Movement of electrons	Cyclic	(a)
Number of photosy-stems	(b)	(c)
Splitting of water	(d)	(d) Present

Answer:

Processes	Cyclic photo phosporylation	Non-cyclic phtotophosp horylation
Movment of electrons	Cyclic	(a) Non-cyclic
Number of phot-osystems	(b) 1, PS I	(c) 2, PS I & PS II
Splitting of water	(d) Absent	present

Question 11.
The first step in respiration is glycolysis.
a) Define glycolysis.
b) Write the site of glycolysis.
Answer:
a) It is the Partial oxidation of glucose into 2 molecules of Pyruvic acid.
b) Cytoplasm

Question 12.
Observe the given figure showing C₄ pathway.
Atmospheric CO₂

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.
Answer:
a) It is the Partial oxidation of glucose into 2 molecules of Pyruvic acid.
b) Cytoplasm

Question 13.
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.
Answer:
a) Anaerobic respiration is the respiration taking place without the involvement of oxygen.
b) Pyruvic acid is converted to Ethanol and CO₂

Question 14.
Notice the three stages of Calvin cycle given below:
a) Arrange the above stages in correct order.
b) Kelvin cycle is also known as C₃ cycle (Pathway). Give reason.
Answer:
a) Carboxylation, Reduction, Regeneration
b) First CO₂ fixation product is a C₂ acid or 3PGA. Hence it is called as C₂ cycle

Question 15.
Match the items of column A with B :

A	B
a) Double fertilisation	i) Bryophte
b) Heterospory	ii) Algae
c) Protonema	iii) Gymnosperm
d) Naked seeds	iv) Angios sperm

Answer:

A	B
a) Double fertilisation	v) Angiosperm
b) Heterospory	iv) Pteridophyte
c) Protonema	i) Bryophyte
d) Naked seeds	iii) Gymnosperm

Question 16.
Cell theory was formulated by two scientists.
a) Name the scientists.
b) Write the two main points in cell theory.
Answer:
a) Schleiden and Schwann
b)
1. All living organisms are composed of cells and their products
2. All cells arise from pre-existing cells

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

Question 17.
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.
Answer:
a) A.Twisted
B. Vexillary
b) In twisted aestivation, the one margin of the appendage overlaps the next one and so on .
c) In this the largest petal (standard petal) overlaps the two lateral petals (wing petals) which in turn overlap the two smallest anterior petals (keel petals)

Question 18.
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.
Answer:
a) Auxin, Gibberellin, Cytokinin
b) Abscisic acid (ABA)
c) 1) It promotes abscission and dormancy.
2) It acts as inhibitor of plant metabolism

Question 19.
Observe the figures A and B given below:

a) Name the type of venation in A and B.
b) Define venation.
Answer:
a) A.Reticulate
B. Parallel
b) Arrangement of veins and veinlets in the lamina of leaf

Question 20.
Observe the figure given below:

Write any three features on mesophyll cells from the figure.
Answer:

1. Mesophyll possesses chloroplasts of two types palisade parenchyma and spongy parenchyma.
2. Numerous large space and air cavities are found between spongy cells.
3. Palisade parenchyma arranged to wards daxial side.