Plus One Botany Previous Year Question Paper 2018

Kerala Plus One Botany Previous Year Question Paper 2018

Time: 1 Hours
Cool off time : 10 Minutes

General Instructions to candidates :

• There is a ‘cool off time’ of 10 minutes each for Botany and Zoology in addition to the writing time ‘ of 1 hour each. Further there is a ‘ 5 minutes’ ‘preparatory time’ at the end of the Botany Examination and before the commencement of the Zoology Examination.
• Use the ‘cool off time’ to get familiar with the questions and to plan your answers.
• Read the instructions carefully.
• Read questions carefully before you answering.
• Calculations, figures and graphs should be shown in the answer sheet itself.
• Malayalam version of the questions is also provided.
• Give equations wherever necessary.
• Electronic devices except non programmable calculators are not allowed in the Examination Hall.

Answer all questions from question numbers 1 to 4. Each carry one score. (4×1=4)

Question 1.
Fill in the blank.
In Anabaena specialized cells called…… help in nitrogen fixation.

Question 2.
There are different types of leucoplasts in plant cells. Name the leucoplast that store proteins.

Question 3.
Observe the relationship between the first two terms and fill in the blank.
Epipetalous Stamen – Brnjal
………… – Lily

Question 4.
Choose the correct answer from the bracket.
First stable product of carbon dioxide fixation in C₄ plant is ……….

(PGA, OAA, PEP, RUBP)

Answer any seven from question numbers 5 to 13. Each carries two scores. (7×2=14)

Question 5.
Match the following :

Question 6.
Complete the flowchart given below.

Question 7.
Ribosomes are organelles without a membrane found in all cells. Name another organelle devoid of membrane, seen in animal cells. Write its function

Question 8.
Plants are adversely affected by manganese toxicity. Mention the effects of manganese toxicity in plants.

Question 9.
Following figure shows the citric acid cycle

Identify the steps where FADH₂ and GTP are synthesized.

Question 10.
The given figure shows a plant belonging to liverworts. Identify the plant. Name the asexual buds seen on it and write their features.

Question 11.
State any four features of facilitated diffusion.

Question 12.
Write a note on the phenomenon plasticity exhibited by plants with an example.

Question 13.
The breakdown of glucose to pyruvic acid is called glycolysis. Where does it occur in a cell? How many ATP molecules are directly syn-thesized during this process?

Answer any four from question numbers 14 to 18. Each carries three scores.(4×3=12)

Question 14.
The tissue found between the upper and lower epidermis of a leaf is called mesophyll.
a. Write the type of cells found in this tissue in a dicot leaf.
b. Mention two differences between a dicot leaf and monocot leaf.

Question 15.
Photosynthesis is a process influenced by environmental factors as well as plant factors. Mention three factors under each category.

Question 16.
First phase of meiosis I is typically longer and complex one. Name it. Mention the five sub divisions of this phase.

Question 17.
Plant growth regulators can be employed for various agricultural and horizontal prac¬tices. Identify the growth regulators that can be used for the following purposes.
a. To have weedfree lawns
b. To increase sugarcane length
c. Fruitset in pineapples
d. Rooting in stem cuttings
e. Inhibiting seed germination
f. To promote female flowers in cucumber

Question 18.
Certain stages in cell cycle are given below. Karyokinesis, Prophase, Cytokinesis, Meta-phase, Anaphase, Telophase.
Choose the statements (from those given below) that match with these stages and prepare a table.
• Centromere split and chromosomes move to opposite poles.
• Chromosomes cluster at opposite poles and nuclear envelope assembles around.
• Chromosomes seems to be with two chromatids attached at centromere.
• Chromosomes arranged at spindle equator.
• Separation of daughter chromosomes.
• Division of cytoplasm.

Answers

Answer 1.
Heterocysts

Answer 2.
Aleuroplasts/ Proteinoplast

Answer 3.
Epiphyllous

Answer 4.
OAA

Answer 5.

Answer 6.
a. Secondary xylem
b. Metaxylem
c. Exarch
d. Stem

Answer 7.
Centrioles
Functions: Cell division, formation of basal body of flagella or cillia, spindle apparatus during cell division.

Answer 8.
• Chlorosis
• Necrosis
• Brown spots surrounded by chlorotic veins.
• Manganese competes with iron and magnesium for uptake.

Answer 9.
FADH₂ – Between the conversion of succinic acid to malic acid.
GTP -Between the conversion of α- ke- toglutaric acid to succinic acid.

Answer 10.
Plant : Marchantia ( Bryophyte)
Asexual buds : Gemma/ Gemmae
Features – Gemmae are green, multiel- lular, asexual/vegetative buds which develop in small receptacles. Gemmae become detached from the parent body and germinate to form new individuals.

Answer 11.
• Requires special membrane proteins.
• Highly selective.
• Not requires ATP energy.
• Transport saturates.
• Transport of molecules along the concentration gradient.

Answer 12.
Plants follow different pathways in response to environment or phases of life to form different kinds of structures. This ability is called plasticity.
E.g., Heterophylly in Cotton, Coriander and Larkspur etc.

Answer 13.
Glycolysis take place on cytoplasm or cytosol.
Glycolysis forms 2 ATP molecules per glucose molecule.

Answer 14.
a. Palisade parenchyma and spongy parenchyma

Answer 15.
Plant factor
Number, size, age, orientation of leaves, mesophyll cells, chloroplasts, internal C0₂ : concentration, amount of chlorophyll. External factor
Availability of sunlight, temperature, C0₂, concentration, water, availability of nutrients in the soil.

Answer 16.
Prophase I
Five sub divisions : Leptotene, Zygotene, Pachytene, Diplotene and Diakinesis.

Answer 17.
a. 2,4-D (2,4- Dichlorophenoxy acetic acid)
b. Gibberellin
c. Ethylene
d. Auxin
e. ABA /Abscisic acid
f. Ethylene / Ethephon

Answer 18.

Plus One Chemistry Previous Year Question Papers and Answers