KENDRIYA VIDYALAYA SANGATHAN [SILCHAR REGION] SESSION ENDING EXAMINATION 2017

SUBJECT : BIOLOGY CLASS-XI (SOLVED PAPER)

Time: 3 Hours

Max. Marks: 90

General Instructions:

1. All questions are compulsory and explain answers with proper headings.
2. Do not write anything on the questions paper.
3. Questions No. 1 to 5 are of 1 mark each Answer to these questions carry 1 mark each. They are required to be answered in one sentence.
4. Questions No. 6 to 10 are of 2 marks each. Answer to these questions may be answered in about 50-25 words.
5. Questions No. 11 to 22 are of 4 mark each. Answer to these questions may be answered in about 100-120 words.
6. Question No. 23 is of 4 marks. Answer to this question may be answered in about 150 words.
7. Questions No. 24 to 26 are of 5 marks each. Answer to these question may be answered in about 200 words.
8. 15 minutes time has been allotted to read this questions paper.
9. What is Tidal Volume? 1
10. In which type of muscle tissue can you see intercalated discs? What is its significance? 1
11. Name the pathways by which water flow from roots hair to the deeper layers of root. 1
12. Why is meiosis known as 'Reduction Division'? What is its significance? 1 Expand the following terms:
13. ANF (b) JGA 1
14. List out the major groups of protozoans. 2

Identify the type of synovial joint present in the following parts of the human body: 2

1. Between axis and atlas vertebrae
2. Between humerus and pectoral girdle
3. Between carpal and metacarpal of thumb
4. Knee joint
5. What is guttation? Mention the factors responsible for this process. 2
6. Mention the ploidy of the following:
7. Protonemal cell of moss
8. Prothallus cells of fern
9. Primary androecium nucleus in dicot
10. Leaf cell of a gymnosperm 2

OR What are the rules of binomial nomenclature? 2

Draw the diagram of the following types of chromosomes.

1. Metacentric (b) Acrocentric 2

1. What are the various types of nitrogen bases found in DNA? Name the type of bond seen between (a) two

nitrogen bases of DNA (b) phosphate and hydroxyl group of sugar of DNA. 3

1. The ammonia that is absorbed by the plants is used to synthesize various amino acids. Explain the main two ways

by which this is done. 3

Identify the function of each of the enzyme given below. Also write the sources of each of these enzymes.

1. Trypsin (b) Maltase (c) Pepsin 3

Differentiate between C₃ plants and C₄ plants. 3

1. Draw a well labelled diagram of the regions of the root tip. 3
2. Identify the phylum that exhibit each of the following feature :
3. Jointed appendages Comb plates
4. Water vascular system Pseudocoelom
5. Metagenesis Notochord 3

Enzymes are classified into different groups based on the reaction they catalyse. Write the name and function of each of these groups of enzymes. 3

1. Why is ABA known as 'stress hormone'? Mention any two functions of this hormone. How are they antagonistic

to gibberellins? 3

1. How are neurons classified based on the number of axons and dendrites? 3

OR Which are the different parts of fore brain? Give any one function of each of these parts. 3

1. Draw a well labeled diagram of the structure of mitochondrion. 3
2. The transverse section of a plant material shows the following features: ٠ Vascular bundles are conjoint, closed and scattered and are surrounded by the sclerenchymatous bundle sheath.

What will you identify it as? Also, write any other four features of this specimen. 3

1. Draw a labeled diagram of anaphase of mitosis. Write any two key features of this phase. 3
2. A hospital is arranging an awareness campaign in your locality on 'obesity and other lifestyle disorders'. They are giving a detailed explanation on the causes and effects of these disorders.
3. As per your opinion, what are the ill effects of Obesity?
4. What are the various values shown by the hospital authorities in this case?
5. According to you, who will be benefited by this programme, hospital authority or you. Support your answer by giving reasons.
6. Name the type of connective tissue that stores fat. 4
7. Schematically represent the steps of glycolysis. 5

OR Explain the steps in non-cyclic photophosphorylation. Why is it called so? 5

1. Write any five reasons by which a person can become type 2 diabetes patient. 5
2. How can you distinguish hypothyroidism and hyperthyroidism? Suggest any five ways to distinguish between

them. 5