Plus One Botany Model Question Papers Paper 3

Plus One Botany Model Question Papers Paper 3 is part of Plus One Botany Previous Year Question Papers and Answers. Here we have given Plus One Botany Model Question Papers Paper 3

Plus One Botany Model Question Papers Paper 3

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.

Questions 1-3. Answers all questions. Each question carries 1 score.

Question 1.
Choose the correctly matched pair
a. Golgi apparatus – Synthesis and storage of energy
b. Lysosome – Digestion of intercellular materials
c. Mitochondria – Packaging and delivery of materials

Question 2.
Identify the statement which is applicable to cyanobacteria.
a. Important decomposers
b. Form blooms in polluted water
c. Presence of prominent nucleus
d. Completely lack of a cell wall

Question 3.
The following diagram represents five petals of a flower in a plant belonging to a major family.

Identify the family.

Questions 4 -11. Answers any 6 questions. Each question carries 2 score.

Question 4.
Complete the given table of algal divisions and their main characteristics by filling ‘a’, ‘b’, ‘c’ and ‘d’.

Question 5.
Transpiration has more than one purpose in plants. Write any one purpose of transpiration in plants and list any two factors that affect this process.

Question 6.
Unlike a majority of the pteridophytes, genera like Selaginella and Salvinia show a unique feature in spore formation.
a. What is this feature?
b. Briefly comment on its significance.

Question 7.
Even though more than, sixty elements are found in different plants, all are not essential.
Write any two criteria for the essentially of an element.

Question 8.
C₄ plants have special features. List out any four specialities of C₄ plants compared to C₃ plants.

Question 9.
Glycolysis is a partial oxidation process. Justify.

Question 10.
Light reaction is otherwise called photo-phosphorylation

a. Locate the site of this reaction.
b. Write any two differences between cyclic photo phosphorylation and non-cyclic photo phosphorylation.

Question 11.
Analyse the given statements and correct them with respect to the underlined words.
a. Respiration is an anabolic pathway.
b. The site of perception of light by a plant for a photoperiodic response is a flower.

Questions 12-17. Answers any 5 questions. Each question carries 3 score.

Question 12.
The diagram given below shows parts of a true fruit.

a. Write the technical name of this fruit developed from a monocarpellary superior ovary.
b. Label the parts A and B.
c. Can you distinguish a parthenocarpic fruit from the given fruit.

Question 13.
Given below are the scientific terms related to photosynthesis. Classify them in appropriate manner, in the given table.

Question 14.
Observe the diagram and answer the following.

a. This is a peculiar type of plant cultivation. Name it.
b. Aeration is necessary for the conduct of this type of cultivation. Why?

Question 15.
Given below is the floral diagram of a family you have studied.

a. Identify the family and aestivation of corolla.
b. Describe three other floral characters from the floral diagram using technical terms.

Question 16.
In an anatomy lab, Ramu and Salim were taking transverse sections (T.S) of two specimens, A and B respectively. Their observations are given in the table. Complete the table.

Question 17.
Even though algae are primary producers on aquatic ecosystems, man is benefited by algae in a variety of ways. Write any four points in favour of this statement.

Answers

Answer 1.
b.

Answer 2.
Form blooms in polluted water.

Answer 3.
Fabaceae.

Answer 4.
a – Starch
b – Fucoxanthin
c – Rhodophyceae
d – Floridean starch

Answer 5.
Transpiration is a mechanism for water ex-change.
Transpiration is affected by:
External temperature, humidity, light.
Wind speed
Number and distribution of stomata.
Percentage of open stomata.

Answer 6.
a. Heterosporous.
b. It produces megaspores and micros-pores. Microspore develops into male gametophyte and megaspore develops into female gametophyte. The female gametophyte retained in the parent sporophyte for a short period and it is considered to be the seed habit.

Answer 7.
The mineral should support growth and re-production. The requirement of the element should be specific and not replaceable by another element. The element should directly involved in the metabolism of plant.

Answer 8.

Answer 9.
Glycolysis is a partial oxidation, glucose undergo oxidation to form two molecules of pyruvic acid. And this pyruvic acid undergo many type of reaction according to the organism and form the sub-stance which our body need. Pyruvic acid, in yeast like organism undergo fermentation and form Co₂ and ethanol. In animal cells it form lactic acid. Finally reach in Krebs cycle then undergo electron transport then it form ATP. Such a long cycle is needed to convert glucose to ATP. So we say that glycolysis is a partial oxidation.

Answer 10.
b. Grana.
c. Non-cyclic: When the two photosystems work in a series, first PS II and then the PS I, a process called non- cyclic photo-phosphorylation occurs. The two photo-systems are connected through an electron transport chain, as seen earlier -in the Z scheme. Both ATP and NADPH + H⁺ are synthesised by this kind of electron flow.

Cyclic: When only PS I is functional, the electron is circulated within the photosystem and the phosphorylation occurs due to cyclic flow of electrons. A possible location this could be happening is in the stroma lamellae. The excited electron does not pass on to NADP+ but is cycled back to the PS I complex through the electron transport chain. The cyclic flow hence, results only in the synthesis of ATP.

Answer 11.
a. The term anabolism means building up process. The term catabolism means break down process. Respiration involve the break down of organic molecules like glucose. But Intermediate compounds produced during the break down of glucose is used for synthesis of complex molecules like fats and proteins. Therefore respiratory pathway involve both anabolism and catabolism, hence can be considerate as amphibolic pathway.
b. The site of perception of light by a plant for a photo periodic responds is not a flower but leaves.

Answer 12.
a. Drupe.
b. A – Epicarp, B – Mesocarp
c. Parthenocarpic fruit is the fruit which formed without fertilization of the ovary. But in figure it is true fruit which formed by fertilization of monocarpellary superior ovary.

Answer 13.

Answer 14.
a. Hydroponics.
b. In this system plants are cultivated under greatful nutrient medium. A plant can live only in the presence of O₂. O₂ supply is necessary for the growth of plants/absorption of nutrients.

Answer 15.
a. Fabaceae. The aestivation of corella is vexillary.
b. Infloroscence – Racemose Flower – Bisexual, zygomorphic.
Calyx – Sepals five, gamosepalous.

Answer 16.

Answer 17.
Agar is obtained from gracillaria and geledium used for the preparation of icecream and jellies.
Chorella and spirullina are abundant in protein and used as food supplement by the space travellers.
70 species of marine algae are used as food. Half of the Co₂ fixation on earth is done by algae.

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