KENDRIYA VIDHYALAYA SANGTHAN SESSION ENDING EXAMINATION 2014-15

SUBJECT : BIOLOGY CLASS-XI (SOLVED PAPER)

M.M.: 70

Duration: 3 Hrs.

General Instructions:

All questions are compulsory.

Section-A contain 5 questions of one mark each, section-B is of 7 questions of two marks each, section-C is of 9 questions of three marks each, section-D has 1 value based question of 4 marks and section-E is of 2 questions of five marks each.

1. Internal choice has been provided in one question of two marks, one question of three marks and all the three questions of five marks.
2. Draw the neat and properly labelled diagrams wherever necessary.

SECTION-A

What is respiratory quotient?

Mass flow hypothesis is related to which process in plants?

Name the smallest amino acid and draw its structure.

1. What is glycocalyx?
2. What is the role of leghaemoglobin in biological nitrogen fixation?

SECTION-B

What is meant by biological nitrogen fixation? Name two free living bacteria that carry out biological nitrogen fixation.

Differentiate between hypogynous and epigynous flowers. Give one example of each.

Mention the two pathways of water movements in root cells with diagrams.

State functions of the followings:

1. Elaioplasts (b) Lysosome

1. (a) What is G-phase in cell cycle?
2. How does cytokinesis differ in plant and animal cells?

Name the stages of cell division in which the these events occur.

Chromosomes more to the equator of the spindle.

Pairing between homologous chromosomes occurs.

1. Crossing over between non-sister chromatids takes place.
2. Centromere splits and sister chromatids are separated.

OR What are porins? Differentiate between antiport and symport type of facilitated diffusion.

Draw a labelled diagram of hypothetical animal showing chordate characters.

SECTION-C

Draw floral diagram and write floral formula of family Liliaceae.

1. Complete the blank spaces in the table given below :

Minerals Absorbed in the form Functions

of ions Zinc ....... Needed for synthesis of auxins

1. ..... .......... Is central atom in chlorophyll molecule
2. Nitrogen Major constituent of proteins, vitamins, enzymes & nucleic acids.

1. Differentiate between :

Protoxylem and Metaxylem.

1. Fascicular cambium and interfascicular cambium.
2. Draw the labelled diagram of a nephron.
3. What is the role of Henle's loop?
4. (a) What is difference between cyclic and non-cyclic photophosphorylration?
5. Name the two amides present in plants.

Solved Paper - 2015 [ 11

SOLUTIONS

SECTION-A

1. Respiratory quotient is the ratio of the volume of carbon dioxide produced to the volume of oxygen consumed

in respiration over a period of time. 1

<math display="block">RQ = \frac{\text{Volume of CO}_2 \text{ evolved}}{\text{Volume of O}_2 \text{ absorbed}}</math>

1. Mass flow hypothesis is related to translocation of sugars from source to sink.

1

1. Smallest amino acid is glycine.

COOH

<math>H-C-NH_2</math> 1

1. Glycocalyx is the outermost mucilage layer of the cell envelope which consists of non-cellulosic polysaccharides

with or without proteins in prokaryotic cells. 1 1

1. Leghaemoglobin acts as oxygen scavenger.

SECTION-B

1. Reduction of nitrogen to ammonia and then into nitrites and nitrates by living organisms is called biological

nitrogen fixation. e.g., Azotobacter, Beijernickia, Nostoc, Anabaena etc. 2 7. Hypogynous Flowers Epigynous Flowers

1. The ovary or gynoecium develops at its top while The ovary or gynoecium develops below the level

other floral organs are inferior. of other floral organs.

1. The ovary is said to be superior. The ovary is said to be inferior.
2. Example: Mustard, china rose, brinjal etc. Example: Apple, sunflower, cucumber, guava etc.

2

1. Two pathways of water movement are apoplastic and symplastic.

Plasmodesmata Plasma membrane

Epidermis Cortex Endodermis Pericycle

Xylem

= apoplast Casparian strip = symplast 2

1. (a) Elaioplasts: These are colourless plastids which stores fats.
2. Lysosomes: They are suicide bags because of the presence of a large number of digestive enzymes or acid hydrolases in them.
3. (a) G-phase: (i) In this phase the cell is metabolically active and continuously grows but does not replicate its DNA. 杨

14

1. RNA and proteins are synthesized and the cell grows in size.

(b) Cytokines is in plant cells Cytokinesis in animals cells

1. In these cells, wall formation starts in the centre In these cells, cytokinesis is achieved by the

of the cell and grows outward to meet the existing appearance of a furrow in the plasma membrane.

lateral walls.

1. Formation of new cell wall begins with the The furrow gradually deepens and ultimately join

formation of a precursor called cell plate. in the centre dividing the cytoplasm into two.

<math>\frac{1}{2} + \frac{1}{2} = 1</math>