KENDRIYA VIDYALAYA SANGATHAN [MUMBAI REGION] SESSION ENDING EXAMINATION 2016 SUBJECT : BIOLOGY CLASS-XI (SOLVED PAPER)

Time: 3 Hours

Max. Marks: 70

General Instructions:

The question paper consists of six pages.

1. The question paper comprises of five sections A, B, C, D, E and F.
2. All questions are compulsory.

There is no overall choice however; internal choice has been provided in one question of 2 marks, one question of 3 marks and all the questions of five marks category. Only one option in such question is to be attempted.

1. Questions 1 to 5 in Section A are very short questions of one mark each. These are to be answered in one word or one sentence each.

Questions 6 to 9 in Section B are short questions of two marks each. These are to be answered in approximately 20-30 words each.

Questions 10 to 20 in Section C are questions of three marks each. These are to be answered in approximately 30-50 words each.

1. Question 21 in Section D is Value based question of 4 marks.

Questions 22 to 23 in Section E are questions of five marks each. These are to be answered in approximately 80-120 words each.

Questions in section F are OTBA of five marks each.

SECTION - A

-10

1. Genus Panthera includes leo, pardus, tigris etc.... What does leo, pardus and tigris refer to?
2. What are the components of a lichen?
3. Name the cells that regulate the opening and closing of stomata.

Name the most abundant enzyme in the world.

1. Glucagon is known as hyperglycemic hormone. Why?

SECTION - B

Differentiate between monocots and dicots (any four points) 2

Give one example for each of the following: 2

1. A modified stem for food storage.
2. A modified root for additional support.
3. A modified leaf to help in climbing.
4. A modified root for respiration.

1. Plastids are the cell organelles which are found only in plant cells. Name any two types of plastids and 2 mention the function of each.

List any four salient features of Watson-Crick model of DNA. 2 OR What is meant by tertiary structure of a protein? Why a tertiary structure is essential for a protein?

SECTION - C

3

1. Name any two Phyla which have parasitic members.
2. What is Bioluminiscence ? Give an example.

3

1. What is Placentation? Identify the following types of Placentations.

1. (b) (c)

(d)

1. (a) On what basis are enzymes classified? 3
2. List any four classes of enzymes and mention their functions.
3. (a) What is meant by cytokinesis? 3
4. How cytokinesis in plants differ from that in animals?
5. Name the stage between two meiotic divisions.
6. Name the conducting tissues in plants. 3
7. What do they conduct?
8. How does the conduction in them differ?
9. Name the enzyme involved in Nitrogen fixation by Rhizobium. 3
10. Name the pigment seen in root nodules of leguminous plants and explain its role in Nitrogen fixation.
11. Explain the two ways by which NH₄⁺ is used to synthesise amino acids in plants.

Under high concentration of O₂, RuBP binds with O₂ and forms one molecule of phosphoglycerate 3

and phosphoglycolate.

1. What is this process called?
2. Why is this process called a wasteful process?
3. Briefly explain the pathway by which some plants ensure that the RuBisCO functions as a carboxylase, minimising the oxygenase activity.
4. What term is given to the process in yeast where incomplete oxidation of glucose takes place under 3 anaerobic conditions?
5. In which cycle does the complete oxidation of Pyruvate takes place.
6. Explain why the synthesis of ATP through ETS is called oxidative phosphorylation?

Human kidneys can produce urine nearly four times concentrated than the filtrate formed. Explain the 3

mechanism of production of hypertonic urine.

1. Name the following bones: 3
2. Smallest Ear Bone. (b) Collar Bone (c) Knee cap
3. Thigh bone (e) Upper arm bone (f) 1^st Vertebra

Draw and label the structure of a Neuron. 3 OR Draw a labeled diagram of a synapse.

SECTION - D

Shobha was worried that her Tulsi plant was growing tall and was not giving any branches. Her daughter Prabha asked her mother to decapitate the plant.

1. Why did Prabha ask her mother to decapitate the plant? Explain.
2. What values do you attribute to Prabha's act? 4

SECTION - E

1. Explain how the activity of fascicular cambium and cork cambium contribute towards the growth in thickness 5 of a dicot stem.

OR

1. Name the three regions of alimentary canal of cockroach.
2. Mention the role of gizzard, hepatic caeca and malpighian tubules in the alimentary canal of cockroach.
3. How many segments are there in the thoracic region of Cockroach?
4. What does paurometabolous mean with reference to Cockroach?
5. Why is the eye of cockroach called as compound eye?
6. Give the general structure of Amino Acid. 5
7. Classify amino acids on the basis of number of amino group and carboxylic group. Give example for each type.t
8. Illustrate the structure of glycine, alanine and serine.

OR

1. With the help of a diagram explain the structure of an interphase nucleus.
2. How are chromosomes classified based on position of centromere.

SECTION - F (OTBA)

1. (a) Some of the experts consider the digestive system as "mini brain". Why? 2
2. List any three stress related digestive problems. 2
3. With any three examples from your daily life, represent the integrity of various systems of the body. 1
4. List any three healthy habits you can adopt to take good care of your systematic body and its systems. 3

1. "Breast milk is better than formula at protecting newborns from various diseases" Comment. 2