CLASS XI

BIOLOGY (044)

SAMPLE PAPER-01

Max. Marks 70                                                                                                                                                 Time allowed: 3 hours

General Instructions:

1) There are a total of 26 questions and five sections in the question paper. All the questions are compulsory.

2) Section A contains question number 1 to 5, Very Short Answer type questions of one mark each.

3) Section B contains question number 6 to 10, Short Answer type I questions of two marks each.

4) Section C contains question number 11 to 22, Short Answer type II questions of three marks each.

5) Section D contains question number 23, Value Based question of four marks each.

6) Section E contains question number 24 to 26, Long Answer type questions of five marks each.

7) There is no overall choice, however, internal choices have been provided in one question of two marks, one question of three marks and all three questions of five marks. An examinee has to attempt any one of the questions out of the two given in the question paper with the same question number.

SECTION - A

Question 1:  

In many algae, sporophytic generation is represented only by the one-celled zygote and the free-living gametophyte forms the dominant phase of their life cycle. Which type of life cycle do such plants exhibit?

 

Question 2:  

Sameer was fascinated after seeing a pea flower. He observed that there were five petals in it. The largest posterior one was overlapping the two lateral petals which in turn were overlapping the two smallest anterior petals. Based on Sameer’s observations, what conclusion can you draw about the aestivation of its petals?

 

Question 3:

After undergoing several medical tests and procedures, Mr. Sharma was told by the doctor that the lumen of the arteries supplying blood to his heart muscles have become narrower due to deposition of fat and cholesterol. What disorder has Mr. Sharma been diagnosed with?

 

Question 4:

Given below is a reaction catalysed by an oxidoreductase enzyme. Complete the reaction:

         A (reduced) + B (oxidized)

 

Question 5:

Name the region of the vertebrate eye where the optic nerve passes out of the retina.

Section B

Question 6:  

Explain the terms:

(i) Red tide

(ii) Algal bloom

 

Question 7:

Why don’t sponges show tissue level of organization although they are made up of thousands of cells? Explain.

OR

Name two cell organelles which are bound by two membranes. Also state an important function of each.

 

Question 8:

Define the term crossing over. Also mention the stage of cell cycle at which it occurs.

 

Question 9:

What is the source of the enzyme ‘enterokinase’? Mention its action.

 

Question 10:

Where does photolysis of water takes place in plants? State the significance of the process.

 

SECTION - C

Question 11:

Describe briefly the four major groups of protozoans. On what basis are they classified into these groups?

 

Question 12:

Differentiate between the following pairs:

1. Red algae and brown algae

2. Monocot and Dicot angiosperms

3. Racemose and cymose inflorescence

 

Question 13:

Name the largest phylum of animal kingdom? List down at least five of its characteristics.

 

Question 14:

Describe the vascular tissue system in plants.

OR

Draw a neat labeled cellular diagram  of the transverse section through a dicot root. Give its two striking characteristics.

 

Question 15:

Draw a neat labeled diagram of a nerve cell. Also classify the nerve cells on the basis of the number of nerve processes.

 

Question 16:

Describe the 9+2 pattern of arrangement in the axoneme of cilia or flagella.

 

Question 17:

List down the main differences between Meiosis and Mitosis.

 

Question 18:

Explain the three major forms in which carbon dioxide is transported inside the human body.

 

Question 19:

A cyclic process occurs in C₃ plants under conditions of high light intensity, high oxygen concentration and low carbon dioxide concentration. This process doesn’t produce energy instead it consumes it.
(a) Identify the process being referred to? Is it essential for the plant’s survival?
(b) What is the product formed at the end of the process?
(c) Where does this process occur?

 

Question 20:

An individual unconsciously withdraws his hand suddenly after touching a hot object. Draw a schematic diagram of nervous pathway involved in the response.
What is such a response known as?

 

Question 21:

Explain the role of atrial-natriuretic factor in controlling blood pressure of an individual.

 

Question 22:

Explain what would happen if:
1. A rotten fruit is mixed with unripe fruits.
2. Rice seedlings are given gibberellic acid treatment.
3. In the culture media, you forget to add cytokinin.

 

SECTION - D

Question 23:

During the Biology practical class, the teacher came across a permanent slide of an unidentified stage of cell division. She focused it under the objective of a microscope and asked her students to observe the slide and identify it for her. After observing the slide, the students were in a conflict. Some identified it as Metaphase I of meiosis I while the others said it was metaphase of Mitosis. So to resolve the issue, the teacher observed it and informed the students that it was Metaphase I.

i. On what basis, the teacher conclude that the stage was Meiosis I?

ii. How can one differentiate between Metaphase I of meiosis and Metaphase of mitosis?

iii. What is the significance of meiosis?

iv. What value was promoted in the act of the teacher?

 

SECTION - E

Question 24:

Which group of plant kingdom is referred to as the “amphibians of the plant kingdom” and why? List down atleast six characteristics and two examples of such plants.

OR

Discuss prophase I of meiosis I with the help of well labeled diagrams.

 

Question 25:

What do you mean by photophosphorylation? Explain, through a schematic representation, the two mechanisms by which it occurs in the chloroplasts.

OR

(i) Given below is an apparatus used to study a physiological process in plants. Study the same and answer the questions that follow:

 

(a) What is the given apparatus known as?  Name and define the physiological process being studied through this apparatus.

(b) Why does the level of solution Y inside the cavity increases while that of solution X decreases?

(c) Based on your observation, predict and define the tonicity of solutions X and Y.

(ii) Explain what will happen when:

(a) if RBCs are placed in a hypertonic solution?
(b) if marine fishes are introduced into freshwater?

 

Question 26:

Explain the various steps in the digestion of polysachharides  and oligosachharides as the food passes through the different parts of the alimentary canal.

OR

(a) Explain the role of RAAS in regulating the kidney functions.
(b) Give a brief explanation of any two disorders related to the excretory system.

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