CLASS XI

BIOLOGY (044)

SAMPLE PAPER-04

 

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:  

Name smallest living cells that completely lack a cell wall and can survive without oxygen.

Question 2:  

What is the technical term given to a flower which can be divided into two similar halves only in one particular vertical plane? Give an example of such flower.

Question 3:

Name the most abundant protein in the animal world and the whole of the biosphere respectively.

Question 4:

Justify the statement “Aerobic respiration is more efficient than anaerobic respiration.”

Question 5:

What is the name given to the band of nerve fibres that connect the two cerebral hemispheres?

Section - B

Question 6:

Briefly describe the binomial nomenclature system of naming organisms along with an example. Who proposed this system of nomenclature?  

Question 7:

Differentiate between the various components of the phloem tissue on the basis of their:

1. Living status

2. Functions they perform.

Question 8:

What does ‘S’ in 70S and 80S ribosomes refer to? What does it indicate?

Question 9:

RuBiSCO is an enzyme that acts both as carboxylase and oxygenase. State the conditions under which it acts as oxygenase.

Question 10:

Explain the role of Ca⁺² in muscle contraction.

OR

Why do steroid hormones act inside the cell cytoplasm while the peptide hormones act on the cell surface?

SECTION - C

Question 11:

Briefly enlist the various criteria used while classifying animals into various phyla.

Question 12:

Differentiate between the following:

(i) Chordates and non-chordates

(ii) Chondrichthyes and Osteichthyes

(iii) Liverworts and Mosses

Question 13:

What do you mean by simple permanent tissues? Explain their types along with their specific function they perform in plants.

Question 14:

With the help of a diagram explain, into how many categories would you classify a flower based on the position of the ovary. Mention one example in each case.

Question 15:

Draw a well–labelled diagram of the ultrastructure of chloroplast.

Question 16:

Give a brief account of the interphase of the cell cycle. State its significance.

Question 17:

Write a short note on ‘Kranz anatomy’.

Question 18:

What is meant by photoperiodism? How are the plants classified based on the type of photoperiodic response?

Question 19:

Draw a neat labeled diagram showing a transverse section through the alimentary canal duct.

OR

List down any six functions of liver.

Question 20:

Explain what is meant by ‘Chloride shift’. What is the other name given to this phenomenon?

Question 21:

Briefly explain the Rh-incompatibility that arise during pregnancy.

Question 22:

Explain the role of antidiuretic hormone (ADH) in controlling urine volume.

SECTION - D

Question 23:

Mr. Khanna went to the doctor for a routine check-up. His sample of urine was diagnosed to contain high content of glucose and ketone bodies. Based on this observation, answer the following questions:
i. Which endocrine gland and hormone is related to this condition?

ii. Name the target cells on which this hormone acts.

iii. What is this pathological condition called? How can it be rectified?

SECTION - E

Question 24:

Give a few characteristics of Kingdom Fungi. Classify them into various classes along with their chief characteristics and two examples each.

OR

Discuss the various stages of the equational division in animals with the help of diagrams.

Question 25:

Give a detailed account of ETS and Oxidative phosphorylation that occurs during aerobic respiration.

OR

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

(i) Identify the growth curve shown in the figure above. Which type of growth does it indicate?

(ii) State and explain the various phases of such a growth.

(iii) Express the type of growth shown in the graph with the help of an equation. Also mention, what each term in the equation denote.

(iv) Why does the growth slows down or becomes constant after reaching a maximum point on the graph?

(v) Explain the terms ‘differentiation’ and ‘dedifferentiation’.

Question 26:

(i) What is meant by double circulation? Illustrate it with the help of a schematic represention.

(ii) Explain any two disorders related to the cardiovascular system.

OR

(i) Explain the two mechanisms of hormonal action.

(ii) Name the endocrine gland that secretes calcitonin. What roles are played by this hormone?

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