Kerala Plus One Botany Previous Year Question Paper 2017
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.
Question 1.
Who among the following scientists is related with the identification of cytokinins?
a. E. Kurosawa
b. F. Skoog
c. C.Darwin
d. F. W. Went
Question 2.
Read the following statements and select the correct statements from the given choices.
i. Methanogens are present in the guts of ruminant animals
ii. Mycoplasma has distinct cell wall.
iii. Viroids are infectious naked DNA molecule.
iv. Algal component of lichen is phycobiont.
a. ii and iii
b. i and iv
c. i and iii
d. ii and iv.
Question 3.
Algae are useful to man in a variety of ways.
Suggest any four uses of algae.
Question 4.
The root nodules of leguminous plants contain two necessary biochemical compounds for N2 fixation. Identify these compounds.
Question 5.
An important difference between C3 and C4 plants is photorespiration. Explain how photorespiration occurs in C3 plants.
Question 6.
Write any four agricultural applications of ethylene.
Question 7.
Define Blackman’s law of limiting factors and identify any two important factors which influence the rate of photosynthesis in plants.
Question 8.
The movement of water through the root layers is ultimately symplastic in the endodermis. Give a reason.
Question 9.
a. The arrangement of flowers on the floral axis is called ……
i. Aestivation
ii. Phyllotaxy
iii.Placentation
iv.Inflorescence
b. How can you differentiate an actinomorphic flower from a zygomorphic flower ?
Question 10.
a. The tissues involves in secondary growth of dicot plants are vascular cambium and ….
b. Compare the formation of vascular cambia in dicot stem and dicot root.
Question 11.
a. Identify a cell organelle that contains hydrolytic enzymes.
b. Rough Endoplasmic Reticulum (RER) and Smooth Endoplasmic Reticulum (SER) are morphologically and functionally different. Justify this statement.
Question 12.
Given below is the metaphase of mitosis. Analyze the diagram and draw a sketch of anaphase. Write any two events of anaphase.
Question 13.
Glycolysis is the partial oxidation of glucose to produce two molecules of pyruvic acid.
a. Where does glycolysis occur ?
b. Steps of glycolysis are given below. Fill up the blank boxes.
The complete oxidation of pyruvic acid yields three molecules of C02 by a cyclic process in the matrix of mitochondria.
a. Who first develop this cycle ?
b. Draw a diagramatic sketch of the identified cycle.
Answers
Answer 1.
b. F. Skoog
Answer 2.
b. i and iv.
Answer 3.
Helps in Co2 fixation by photosynthesis, in-crease level of oxygen, primary producers on ocean, used as food.
Answer 4.
Nitrogeneous enzyme / Mo – Fe protein leg hemoglobin
Answer 5.
In C3 plants O2 binds to RuBisCO. The RuBP instead of being converted to 2 molecules of PGA, binds with O2 to form one molecule of phosphoglycerate and phosphogly collate in a pathway called photorespiration. Condition for photorespiration are dual nature of RuBisCO, increases O2 concentration, moderate temperature etc.
Answer 6.
1. Ethylene breaks seed and bud dormancy, initiates germination in peanut seeds, sproutind of potatao tubers.
2. Ethylene promotes rapid internode/petiole elongation in deep water rice plants, It helps leaves/ upper parts of the shoot to remain above water.
3. Ethylene also promotes root growth and root hair formation.
4. Ethylene is used to initiate flowering and synchronising fruit – set in pineapples.
Answer 7.
The law states that, if a chemical process is affected by more than one factor, then its rate will be determined by the factor which directly affects the process if its quantity is changed.
For example, despite the presence of a green leaf and optimal light and Co2 conditions, the plant may not photosynthesis, if the temperature is very low. This leaf, if given the optimal temperature will start photosynthesizing.
Answer 8.
Simplistic system is the movement of water occurs from cell to cell through plasmodesmata. Most of the water flow in the roots occur via apoplast since the cortical cells are loosly packed, hence offer no resistance to water movement. The continuation of cell walls breaks in the endodermis of the root due to presence of waxy casperian strips which are impermeable. So the movement of substances in endodermis occurs any simplest.
Answer 9.
a. iv. Inflorescence
b.The flower can be divided into two equal halves along more than one longitudinal plane, i.e., they are radially symmetrical. Such flowers are actinomorphic. Zygomorphic flower cannot be divided into two similar halves in any plane.
Answer 10.
a. Cork cambium
b.
Answer 11.
a. Lysosomes
b. In some ER, spherical granular structures called ribosomes are attracted on the surface. This type of ER is called RER. It occurs in almost all cells which are actively engaged in protein synthesis.
In SER, ribosomes are not attached with ER and the surface is smooth. It is well developed in cells that synthesize steroid hormones.
Answer 12.
Anaphase
Centromeres split and chromatids separate.Chromatids move to opposite poles.
The centromere of each chromosome is towards the pole arms towards the equator.
Answer 13.
a. Cytoplasm (Cytosol)
b. A. Glucose – 6 – phosphate
B. Fructose – 6 – phosphate
C. Fructose – 1, 6 – biphosphate
D. 1, 3 biphosphoglyceric acid / Triose biphosphate
E. 2 – phosphoglycerate / 2 – phosphoglyceric acid
F. Phosphoenol pyruvate / Phospho enolpyruvic acid
OR
a. Hans Kreb
b.
