Thursday, October 29, 2020

2018 JULY Improvement | HSE +1 Exam | Botany Question Paper

2018 JULY Improvement (+1) 
PART A: BOTANY 

Answer all questions from question numbers 1 to 4. Each carries one score. (4 x 1 = 4)

1. Fill in the blank.

Small disc-shaped structures at the surface of the centromere are called ...........

2. Observe the relationship between first two terms and fill in the blank.

C4 plants: PEP case 
C3 plants: ...................

3. Which one of the following features are applicable to bacteriophages?

a) They are bacterial viruses.
b) They have double stranded DNA as genetic material.
c) The protein coat is called capsid.

i. a) and b)
ii. b) and c)
iii. a) and c)
iv. All of these

4. Choose the CORRECT answer.

All tissues on the inner side of the endodermis together constitute.

a) Conjuctive tissue
b) Stele
c) Pericycle
d) Vascular bundle

Answer any 7 questions from question numbers 5 to 13. Each carries 2 scores. (7 X 2 = 14)

5. The following figures A and B shows two different types of phyllotaxy.

  
Identify the phyllotaxy A, B and explain them.

6. Observe the given stage of mitosis. 

Identify the stage and Write any two features of it.

7. The element is said to be deficient when present below the critical concentration. What is critical concentration? State any two kinds of deficiency symptoms shown by plants.

8. Match the items of column A with column B.

Column A

Column B

a.       Prothallus

      i.      Asexual buds in liverwort

b.       Protonema

    ii.      Sporophyte of angiosperms

c.       Antheridium

  iii.      Thalloid gametophyte of pteridophyte

d.       Gemmae

   iv.      Male sex organs in bryophytes

 

     v.      Gametophytic stage of mosses


9. Observe the following pathways of anaerobic respiration. 



Identify the products A and B.
Give an example of organism in which any of these products are formed.

10. Observe the T.S. of a plant p given below. 


Identify the plant part and explain any two (features of its vascular bundles.

11. The opening and closing of stomata is aided by the peculiarities of bean shaped guard cells. Mention any two such peculiarities.

12. Observe the figure given below. 


Fill in the blanks A. B, C and D with appropriate terms from the box given below.

13. Amides contain more nitrogen than the amino acids. Name two important amides found in plants and explain their formation.

Answer any 4 questions from question numbers 14 to 18. Each carries 3 scores. (4 X 3 = 12)

14. The nucleoplasm contains small spherical shaped structures.

a) Name the structures.
b) Name the openings seen in nuclear envelope and state their function.

15. There are certain seeds which to germinate even under favourable external conditions. This is called seed dormancy.

a) State any two reasons for seed dormancy.
b) Suggest two manmade measures for breaking seed dormancy.

16. Arrange the following events in the appropriate boxes.

a. Formation of ATP and NADPH2.
b. Only photosystem I is functional.
c. Formation of ATP only
d. Both photosystem l and photosystem II are involved. 
e. Splitting of water. 
f. No oxygen release. 

Cyclic photo-phosphorylation

Non-Cyclic photo-phosphorylation

 

 


17. Based on the symmetry, the flowers can be classified into three types. Name and explain them.

18. Name and explain the structure of cell organelle that is involved in photosynthesis.

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