Plus Two Botany Model Question Papers Paper 5

Plus Two Botany Model Question Papers Paper 5 is part of Plus Two Botany Previous Year Question Papers and Answers. Here we have given Plus Two Botany Model Question Papers Paper 5

Plus Two Botany Model Question Papers Paper 5

Time: 1 Hours
Cool off time : 10 Minutes

General Instructions to candidates:

• There is a ‘cool off time’ of 15 minutes in addition to the writing time of 2 hrs.
• Your 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.

Answer all the questions. Each question carries 1 score.

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

Question 2.
Name the first transgenic cow.

Question 3.
The hard outer layer of pollengrain is com-posed of
a. cellulose
b. Pectin
c. Suberin
d. Sporopollenin

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

Answer any 10 questions. Each question carries 2 score.

Question 5.
Artificial hybridisation is one of the major approaches of crop improvement program-me. Suggest the techniques used to protect the stigma of bisexual flowers during hybridisation.

Question 6.

Observe the above figure
a. Identify i and ii
b. Distinguish i and ii

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

Question 8.

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

Question 10.
Isolation of DNA from plant cell involves many steps. Explain the different steps.

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

Question 12.
Succession takes place on bare rock is called Xerarch succession. List out its sequential stages

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.

Question 14.
Match the column A with B

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.

Question 16.
High level of noise is considered as pollution.
a. What are its effects?
b. How it can be controlled?

Answer any 2 questions. Each question carries 3

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

Question 18.
For reducing the air pollution in delhi the entire fleet of public transport buses were converted to CNG
a. Exand CNG
b. List out its advantages.

Question 19.
Identify the following interactions
a. Barnacles on whale
b. Wasp on fig.
c. Ticks on dog
d. Abigdon tortoise and goats
e. Tiger and deer
f. Mycorrhiza

Answers

Answer 1.
Phytophagous

Answer 2.
Rosie

Answer 3.
Sporopollenin

Answer 4.
FSH (Follicle Stimulating Hormones)

Answer 5.
This is achieved by emasculation and bagging techniques. If the female parent bears bisexual flowers, removal of anthers from the flower bud before the anther dehisces using a pair of forceps is necessary. This step is referred to as emasculation. Emasculated flowers have to be covered with a bag of suitable size, generally made up of butter paper, to prevent contamination of its stigma with unwanted pollen. This process is called bagging. When the stigma of bagged flower attains receptivity, mature pollen grains collected from anthers of the male parent are dusted on the stigma, and the flowers are rebagged, and the fruits allowed to develop.

Answer 6.
a. i. Proinsulin
ii. Insulin
b. Insulin used for diabetes was earlier extracted from pancreas of slaughtered cattle and pigs. Insulin from an animal source, though caused some patient to develop allergy or other types of reactions to the foreign protein. Insulin consists of two short polypeptide chains. Chain A and chain B, that are linked together by disulphide bridges. In mammals, including humans, insulin is synthesised as a pro-hormone which contains an extra stretch called the C peptide.

Answer 7.

• Knowledge of the nature and habits of bees.
• Selection of suitable location for keeping rtthebeehives.
• Catching and hiving of swarms (group of bees).
• Management of beehives during different seasons.
• Handling and collection of honey and of beewax.

Answer 8.
Inverted pyramid of biomass. Pyramid of biomass shows relationship between producers and consumers in an ecosystem terms of biomass. If can be inverted in case of pond ecosystem. If shows small standing crop of phytoplankton supports large standing crop of zooplankton

Answer 9.

1. Zygote formed changes into embryo
2. Ovule changes into seed
3. Ovary develops into fruit and
4. Sepals and petals neither away

Answer 10.
The separated DNA fragments can be visualised only after staining the DNA with a compound known as ethidium bromide followed by exposure to UV radiation (you cannot see pure DNA fragments in the visible light and without staining). You can see bright orange coloured bands of DNA ! in a ethidium bromide stained gel exposed to UV light. The separated bands of DNA are cut out from the agarose gel and extracted from the gel piece. This step is known as elution. The DNA fragments purified in this way are used in constructing recombinant DNA by joining them with cloning vectors.

Answer 11.

1. Release of pollen much before or much after the stigma is ready to accept it.
2. Placement of anther & stigma at such positions so that the pollens do not reach the stigma of the same plant or the same flower.
3. It is a chemical method in which the stigma inhibits the growth of the pollen tubes into the pistil. This process 15 known as self-incompatibility.
4. Production of flowers or plants that are uni-sexuel.

Answer 12.

• Pioneer species are the first ones to in vade a bare area, i.e., on rocks.
• These are usually lichens which secrete acids to dissolve rock, helping in weathering and soil formation.
• This paves way for some very small plants like bryophytes, which are able to grow in the small amount of soil.
• Over the time, they are succeeded by bigger plants and after several more stages, ultimately a stable climax forest community is formed.
• The climax community remains stable if the environment remains unchanged.
• With time, the xerophytic habitat gets converted into a mesophytic one.

Answer 13.
a. Syngamy & Triple fusion
b. Syngamy: The pollen tube releases two male gametes into a cytoplasm of a synergid out of which one male gamete fuses with the egg cell to form a diploid zygote. This process is called syngamy.
Triple Fusion : The other male gamete fuses with the two polar nuclei in the central cell to form triploid PEN (Primary Endosperm Nucleus). This process is called triple fusion.

Answer 14.
1 – d
2 – a
3 – c
4 – b

Answer 15.
a. Adenosine deaminase (ADA) deficiency
b. In some children ADA deficiency can be cured by bone marrow transplantation; in others it can be treated by enzyme replacement therapy, in which functional ADA is given to the patient by injection. But the problem with both of these approaches that they are not completely curative. As a first step towards gene therapy, lymphocytes 18. from the blood of the patient are grown in a culture outside the body. A functional ADA cDNA (using a retroviral vector) is then introduced into these lymphocytes, which are subsequently returned to the patient. However, as 19. these cells are not immortal, the patient requires periodic infusion of such genetically engineered lymphocytes. However, if the gene isolate from marrow cells producing ADA is introduced into cells at early embryonic stages, it could be a permanent cure.

Answer 16.
a.

• It may cause sleeplessness, increased heart rate, breathing problem, feeling of stress.
• Discomfort, permanent hearing loss and other psychological and physiological disorders,

b.

1. Turn off appliances at Home & Offices
2. Use ear plugs
3. Follow the limits of noise level
4. Go Green by planning trees
5. Regularly check noise level
6. Hotify authorities about disobedience of noise rules.

Answer 17.
Gel electrophoresis The cutting of DNA by restriction endonucleases results in the fragments of DNA. These fragments can be separated by a technique known as gel electrophoresis. Since DNA fragments are negatively charged molecules they can be separated by forcing them to move towards the anode under an electric field through a medium/ matrix. Nowadays the most commonly used matrix is agarose which is a natural polymer extracted from sea weeds. The DNA fragments separate (resolve) according to their size through sieving effect provided by the agarose gel. Hence, the smaller the fragment size, the farther it moves.

Answer 18.
a. CNG – Compressed Natural Gas
b.

1. CNG burns most efficiently, unlike petrol, petrol or diesel
2. CNG is cheaper than petrol or diesel
3. It cannot be siphoned off by thieves.

Answer 19.
a. Commensalism
b. Mutualism
c. Parasitism
d. Competition
e. Predation
f. Mutualism

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