CLASS XI

BIOLOGY (044)

SAMPLE PAPER-03

 

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:  

Under which kingdom of the five kingdom classification would you place a multicellular organism having its cell walls chiefly composed of chitin and exhibiting saprotrophic mode of nutrition?

Question 2:  

What peculiarity is seen in the leaf venation and root system of dicotyledonous plants?

Question 3:

What is arrangement of microtubules in the centrioles?

Question 4:

How many ATP molecules are required in the synthesis of one glucose molecule via C₃ pathway?

Question 5:

How is ‘ilium’ different from ‘ileum’?

Section - B

Question 6:  

Give any four characteristic features of Chrysophytes.

OR

Identify the phyla of invertebrates to which the organisms exhibiting the following chief characteristics could be classified into:

i. presence of stinging cells that aid in catching their prey.

ii. property to emit light along with rows of ciliated comb plates.

iii.  possess malphigian tubules as their excretory organs.

iv. possess a well developed water vascular system.

Question 7:

Write down the three main types of meristems on the basis of their position in the plant body along with the roles they play.

Question 8:

Discuss the various type of chromosomes based on the position of centromere.

Question 9:

Given below is a figure showing ATP synthesis during respiration. Identify and label the parts mentioned A, B, C, D and E.

Question 10:

Identify parts labeled A,B, C and D:

 

SECTION - C

Question 11:

Describe the important characteristics of Gymnosperms.

Question 12:

Give a brief account of the economic importance of Algae.

Question 13:

What is phyllotaxy? Explain its various types with an example of each.

Question 14:

Draw a well-labelled diagram of the male reproductive system of a frog.

Question 15:

Differentiate between the following pairs:

1. Rough endoplasmic reticulum and Smooth endoplasmic reticulum.

2. Active transport and Passive transport.

3. Prokaryotic cell and Eukaryotic cell

Question 16:

Explain how temperature and pH affect the activities of the enzymes.

Question 17:

Briefly describe the chemiosmotic hypothesis of ATP synthesis in chloroplasts.

OR

Give a schematic outline of the Z-scheme of electron transfer during the photochemical phase of photosynthesis.

Question 18:

List down any six physiological roles played by auxins in plants.

Question 19:

Draw a neat labeled diagram of a longitudinal section through the human kidney.

Question 20:

Briefly explain any three disorders related to the respiratory system in humans.

Question 21:

Describe the structure of the two contractile proteins that help in muscle contraction.

Question 22:

Complete the following table:

Hormones	Glands	Chief Function
1. Oxytocin	(A)	(B)
2. (C)	Adrenal medulla	(D)
3. Progesterone	(E)	(F)

 

SECTION - D

Question 23:

A group of students found a fish on the sea beach. They argued with one another over the nature of the fish. Some said that it was a bony fish while the others said it was a cartilaginous one. To resolve the conflict, one of them suggested asking their teacher. So next day they showed it to their teacher. The teacher told that it was a bony fish and not a cartilaginous fish.

i. On the basis of which characters did the teacher identify it to be a bony fish?

ii. List down any four differences between a bony fish and a cartilaginous fish.

iii. State the reason, why a cartilaginous fish has to swim continuously to remain at a particular depth.

SECTION - E

Question 24:

Compare the three classes of algae based on the following characteristics:

 (i) Habitat

(ii) Major pigments

(iii) Reserve Food

(iv) Cell wall

(v) Mode of asexual reproduction

OR

Discuss the major classes into which the enzymes are classified based on the type of reaction they catalyse.

Question 25:

 Give a detailed account of CO₂ fixation by C₃ pathway.

OR

Explain the activity of vascular cambium in the secondary growth of the dicotyledonous stem.

Question 26:

Explain the mechanism of concentration of urine in mammals.

OR

Given below is figure representing the various phases of a cardiac cycle.

  

(i) Identify the phases labeled A, B and C. State the duration of each phase.

(ii) What is the heart sound heard at the junction of B & C and C & A respectively?

(iii) Define ‘pulse’ and ‘heartbeat’.

(iv) What is the cardiac output, if the stroke volume is 70 ml and heart rate is 72 times per minute?                                **********