Plus Two Botany Model Question Paper 1

Kerala Plus Two Botany Model Question Paper 1 with Answers

Time: 1 Hour
Cool off time : 10 Minutes
Maximum : 30 Score

General Instructions to candidates:

• There is a ‘cool off time’ of 15 minutes in addition to the writing time of 2 hrs.
• You are not allowed to write your answers nor to discuss anything with others during the ‘cool off time’.
• Use the ‘cool off time’ to get familiar with the questions and to plan your answers.
• Read questions carefully before you answering.
• All questions are compulsory and only internal choice is allowed.
• When you select a question, all the sub-questions must be answered from the same question itself.                  ,
• 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.

I. Answer All questions. Each question carries 1 score. (4 × 1 = 4)

Question 1.
Insects feeding on plant sap and other parts are known to be?
Answer:
Pest

Question 2.
Name the first transgenic cow ………..
Answer:
Rosie

Question 3.
The hard outer layer of pollen grain is composed of ………….
a) cellulose
b) pectin
c) suberin
d) sporopollenin
Answer:
d) Sporopollenin

Question 4.
MOET is a programme for herd improvement. Name the hormone used in it.
Answer:
FSH

II. Answer any 10 questions. Each question carries 2 Scores. (10 × 2 = 20)

Question 5.
Artificial hybridisation is one of the major approaches of crop improvement programme. Suggest the techniques used to protect the stigma of bisexual flowers during hybridisation.
Answer:
In artificial hybridisation bagging is used to prevent the entry of unwanted pollen grains, then pollen grains from desired plant is dusted on the stigma, after this stigma again bagged, this is called rebagging.

Question 6.

Observe the above figure
a) Identify i and ii
b) Distinguish i and ii
Answer:
a) i) it contains polypeptide chains A B and C connected together
ii) it contains polypeptide chains A and B connected together but c-peptide chain is separated

b) i) non functional insulin
ii) functional insulin

Question 7.
Bee keeping though relatively easy does require some specialised knowledge. List out the important points for its success.
Answer:

• Knowledge of natural habitat of bees
• Selection of suitable location for keeping bee hives
• Catching and having of swarms
• Handling and collection of honey and bee wax

Question 8.

Identify the above pyramid and justify your answer.
Answer:
It is called pyramid of biomass, here biomass increases in successive trophic levels.

Question 9.
List out any four changes that occur in flower after fertilisation
Answer:

• PEN develops into endosperm
• Zygote develops into embryo
• Ovary develops into fruit
• Ovule develops into seed

Question 10.
Isolation of DNA from plant cell involves many steps. Explain the different steps.
Answer:
At first plant cell wall is removed by using cellulose and pectinase enzyme, after this other components of cell can be removed by protease, lipase, carbohydrates and RNAase.

Then fine DNA Threads are suspended in chilled alcohol, it is obtained for slicing by spooling technique. Thus genetic material is isolated.

Question 11.
Flowering plants have developed many devices to discourage self pollination and to encourage cross pollination. List out such features found in plants.
Answer:

• Pollen release and stigma receptivity are not at the same time.
• The anther and stigma are placed at different positions.
• Self-incompatibility
• Production of unisexual flowers.

Question 12.
Succession takes place on bare rock is called Xerarch succession. List out its sequential stages.
Answer:
Lichen communities are first appear in the rock, after death and decay more amount of organic matter is added to the soil, in addition to this weathering process takes place and all this helps in the formation of next plant communities like bryophytes. Later, Herbs shrubs and finally climax vegetation (forest) appears in each stage one plant the community is replaced by other takes place.

Question 13.
In angiosperms during fertilization two types of fusion occurs in the embryo sac.
a) Name the types of fusion
b) Which are the nuclei involved in each fusion.
Answer:
a) Syngamy and triple fusion
b) In syngamy one male garnets and one egg cell is involved while in triple fusion one male gamete and two polar nuclei are involved.

Question 14.
Match the column A and B

Answer:
1. Catalytic converter – Platinum Palladium
2. Electrostatic precipitator – thermal power plants
3. Montreal protocol – ozone depletion
4. Jhum cultivation – deforestation

Question 15.
The first clinical gene therapy was given to a four year old girl child.
a) What was her genetic disorder?
b) Briefly describe the clinical procedure adopted in this case
Answer:
a) Denosine deaminase deficiency

b) Before gene therapy the diseases was cured by bone marrow transplantation and in enzyme replacement therapy, after genetic engineering, Lymphocytes taken from the patient’s blood, it is cultured outside and into this functional ADA cDNA are introduced, then it is taken back into patients body or functional ADA cDNA are introduced into embryonic stage

Question 16.
High level of noise is considered as pollution
a) What are its effects?
b) How it can be controlled?
Answer:
a) Noise causes sleeplessness, increased heart beating and altered breathing pattern in humans.

b) Use sound absorbing materials in industries. Govt, laws are there to reduce noise pollution around hospitals and schools by avoiding the use of air – horns, restriction in the use of loud speakers etc.

III. Answer any 2 questions. Each question carries 3 scores. (2 × 3 = 6)

Question 17.
Identify the figure given below and explain the principles behind it.

Answer:
Gel electroforesis:
It is used to separate DNA fragments under electric field, At first the DNA fragments are loaded in well, it it moves through the gel and move towards anode according to their size and charge.

For this, DNA are stained by using ethidium bromide and it is visualised by using UV light DNA fragments are appeared as orange coloured bands. It is separated and cut out from the gel by using elusion.

Question 18.
For reducing the air pollution in Delhi the entire fleet of public transport buses were converted to CNG
a) Expand CNG
b) List out its advantages
Answer:
a) Compressed natural gas
b)

• It burns most efficiently.
• It is cheaper than petrol or diesel and
• It cannot be adulterated like petrol or diesel

Question 19.
Identify the following interactions
a) Barnacles on whale
b) Wasp on fig.
c) Ticks on dog
d) Abingdon tortoise and goats
e) Tiger and deer
f) Mycorrhizae
Answer:
a) Barnacles on whale – Commensalism
b) Wasp on fig – Mutualism
c) Ticks on dog – Parasitism
d) Abingdon tortoise and goats – Competition
e) Tiger and deer – Predation
f) Mycorrhizae – Mutualism

Plus Two Botany Previous Year Question Papers and Answers