Malappuram Botany Teachers Association
SECOND YEAR HIGHER SECONDARY SECOND TERMINAL
EXAMINATION- DECEMBER 2022
Part III- BOTANY
HSE: II Maximum score: 30
Time: 1.hr
Cool off time: 10 mnt
General Instructions to Candidates:
There is a ‘cool off time’ of 10 minutes in addition to the writing time of 1.hour.
Use the cool off time to get familiar with questions and to plan your answers.
Read the instructions and questions carefully before answering
Total score of this examination is 30.
Candidates can attempt any questions of their choice from the options given in the
each section.
You are not allowed to write your answers or to discuss with others during the cool
off time.
PART I
Answer any 3 questions from 1 to 4. Each carries 1 score. (3 X 1 = 3)
1. The organisms occupy a specific place in the food chain, this is known as
a) Trophic level
b) Standing crop
c) Stratification
d) Biotic potential
2. Name the stain used in gel electrophoresis
3. Observe the relationship between the first two terms and fill in the blank.
Intine: Cellulose and pectin
Exine:-----------------
4. Find out which of the sentence is false
a) Ovary develops into fruits
b) Zygote develops into embryo
c) Ovule develops into fruits
d) Endosperm develops from PEN
1
PART II
Answer any 9 questions from 5 to 17. Each carries 2 score. (9 X 2 = 18)
5. What are Chasmogamous flowers? Can cross pollination occur in
Cleistogamous flowers? Give reasons for your answer
6. Polymerase chain reaction has 3 steps.
a) Write the 3 steps
b) Name the bacterium from which Taq polymerase is isolated?
7. Arrange the following terms in the correct developmental sequence.
Pollengrain, Sporogenous tissue, Microspore tetrad, Pollen mother cell, male gametes.
8. Differentiate between perisperm and pericarp
9. Fruits like Citrus and Orange show more than one embryo in the seed.
a) What is the condition called?
b) Give reasons
10. Match the columns (A) and (B)
(A) (B)
(i)Mutualism (a)An orchid growing on a tree trunk
(ii)Predation (b)Gauss’s Exclusion Principle
(iii)Commensalism (c) Biological control
(iv)Competition (d) Derives nutrition from the host organism
(e) Mycorrhizae
11. Detritivores play a major role in decomposition
a) What are detritivores?
b) Write an example for a detritivore.
12. Briefly describe any 2 adaptations developed in angiosperms to discourage
self- pollination and to encourage cross pollination
2
13. Pollination is an important mechanism found in flowering plants. Write short note on
a)Geitonogamy b)Xenogamy
14. Expand GFC and DFC. Differentiate the two.
15. What is decomposition? Name the various steps involved in it.
16. Through a successful genetic engineering research you have created a GM plant in a
vegetable crop.
a) To which Government organization will you approach for its commercial production?
b) Give the functions of this organization.
17. Notice the genes given below
Cry I Ac, Cry I Ab, Cry II Ab
a) Choose the gene that controls corn borer from the above
b) Name the bacterium from which cry genes were isolated.
PART III
Answer any 3 questions from 18 to 22. Each carries 3 scores. (3 X 3 = 9)
18. Identify the structure given below and mark A,B,C,D & E.
19. Certain floral features that help for pollination are given below
Flowers are colourful and rich in nectar
Pollen grains are dry and non-sticky
Pollen grains are protected from wetting by a mucilaginous covering.
Feathery stigma
Pollen grains are sticky.
Stigma is sticky and unwettable
3
Choose the features of wind, water and insect pollinated flowers from the above.
20. Observe the flow chart given below
a) What do B,E ,D,I in the flow chart represent?
b) Define D and B
21. How did Eli Lilly company go about preparing the human insulin? How is
the insulin thus produced different from that produced by the functional
human insulin gene?
22. Observe the figures A and B given below
a) Identify the type of pyramids A,B.
b) Which kind of pyramid is always upright? Justify your answer.
