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:  

The common name of Neem is easier to remember than its botanical name Azadirachta indica. Why then, in biology, complex scientific names are preferred over simpler common names?

Question 2:  

How is it beneficial to cultivate a leguminous crop and plough back the field  before sowing rice?

Question 3:

Name the structural and functional unit of excretory system and muscular system.

Question 4:

How many mitotic divisions does a cell need to undergo in order to produce 128 cells?

Question 5:

Why do enzymes become non-functional at higher temperatures?

Section - B

Question 6:  

“Viruses are considered link between living and non-living world”. Explain briefly.

OR

Which group of fungi are called imperfect fungi and why?

Question 7:

Both angiosperms and gymnosperms are seed-bearing plants, yet they are classified separately. Give two reasons for classifying them separately.

Question 8:

Identify the plant growth regulators which stimulate:

(i) cell division even in permanent (non-meristematic) tissues

(ii) stem elongation and leaf expansion.

Question 9:

Briefly explain why desert mammals have long Henles’s loop?

Question 10:

Give any two significant functions of Golgi bodies?

SECTION - C

Question 11:

What do you understand by modification of root? What type of modification is found in the following cases:

(i) Mangrove tree

(ii) Banyan tree

(iii) Sweet potato

Question 12:

Give a schematic representation of photorespiration.                                                        

Question 13:

Name the gaseous plant hormone. Also mention any three physiological roles it plays in plants.                                                     

Question 14:

What is the effect of changing the pH on the dissociation of oxyhaemoglobin? What is this effect commonly referred to as? State its significance.

Question 15:

Name the gland that produces insulin and glucagon. Briefly describe why these two hormones are called antagonistic hormones?

Question 16:

Draw a well-labelled diagram of a mammalian nephron.

OR

Draw a well-labelled diagram of human eye.

Question 17:

Briefly describe any three types of freely movable joints with examples.

Question 18:

List down any six biological functions performed by proteins.

Question 19:

What do you mean by Lock and Key hypothesis of enzyme action?

Question 20:

Briefly explain the active potassium ion theory of opening and closing of stomatal apparatus.

Question 21:

Different substrates get oxidized during cellular respiration. Respiratory quotient (RQ) helps in determining the substrate being respired. If RQ = A/B:

(a) What do A and B stand for?

(b) What type of substrate have RQ value of 1, less than 1 and more than 1?

(c) Which of the following will release more energy? : 1g of glucose or 1 g of fat?

Question 22:

Mitosis results into the production of two similar daughter cells. What would happen if each of the following irregularities occur during mitosis?

(i) DNA duplication does not occur

(ii) Cytokinesis does not occur

(iii) Centromeres fail to divide.

SECTION - D

Question 23:

Seema and her mother visit Mrs. Khandelwal who was not well from some time. On reaching her place they get to know that Mrs. Khandelwal has been hospitalized in for a kidney transplant after a renal failure.

(i) What is meant by kidney failure?

(ii) What are the causes for a kidney failure?

(iii) What is meant by kidney transplant which Mrs. Khandelwal is undergoing?

(iv) What values are promoted in Seema and her mother’s concern towards Mrs. Khandelwal? Also, specify the value reflected in a kidney transplant. 

SECTION - E

Question 24:

Who proposed the five kingdom classification? Draw its outline and mention the criteria used to classify organisms into the five kingdoms. Also give two advantages of using this classification.

OR

With the help of a labeled diagram, explain the fluid-mosaic model of Plasma membrane.

Question 25:

Given below is a graph depicting the variation of percent oxyhaemoglobin saturation at different values of pO₂. Study the same and answer the questions that follow:

(i) What is this graph commonly known as? Name the scientist who constructed it?
(ii) What does shifting of the curve towards the right signify? State any two conditions under which it will shift towards the right?
(iii) What are the conditions that favour association of oxygen molecules with haemoglobin to form oxyhaemoglobin?

OR

Study the figure given below and answer the questions that follow:

(i) What does the figure depict? Define it.

(ii) What do the following in the figure indicate? :
    (a) P-wave
    (b) PQ interval
    (c) QRS-wave
    (d) RS (of QRS wave) and ST interval
    (e) T-wave

(iii) Mention one application of the above graph.  

Question 26:

Give a schematic representation of C4 pathway of carbon fixation. Name any two plants where it takes place. Also, mention the difference in structure of chloroplasts in the mesophyll cells and bundle sheath cells of such plants.

OR

Draw a schematic representation of TCA cycle? Why is it called TCA cycle? What is the other name given to this cycle?                                                                      

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