ROLL NO. NAME CLASS & SECTION

APEEJAY COMMON ANNUAL EXAMINATION, 2018-19

02

CLASS-XI

BIOLOGY (044)

Time allowed: 3 hrs.

Maximum Marks: 70

٠ General Instructions:

1. There are a total of 27 questions and four sections in the question paper. All questions are compulsory.
2. Section A contains question numbers 1 to 5, Very Short answer type questions of one mark each.
3. Section B contains question numbers 6 to 12, Short Answer type I questions of two marks each.
4. Section C contains question numbers 13 to 24, Short Answer type II questions of three marks each.
5. Section D contains question numbers 25 to 27, Long Answer type questions of five marks each.

There is no overall choice in the question paper; however, an internal choice is provided in two questions of one and two marks each, three questions of three marks and all questions of five marks. An examinee is to attempt any one of the questions out of the two given in the question paper with the same question number.

SECTION-A

1. What will be the axis of expansion of the thoracic chamber when external intercostal muscles and diaphragm contracts during inspiration? (1)
2. Which organ is affected when a person is suffering from jaundice and why does skin and eyes turn yellow? (1)
3. If you are given twigs of two plants how will identify a twig having simple leaf from that of a twig having compound leaves? (1)
4. What is the advantage of having more than one pigment molecules in a Photocenter? (1)

P.T.O.

OR

How chloroplasts are aligned in the mesophyll cells during light reaction and why do they do so?

1. Why an oxygen scavenger, leg-haemoglobin is required in the root nodules of leguminous plants?

OR

Why flow of water in the roots via apoplastic way beyond endodermis impossible?

(1)

SECTION-B

1. Two potted plants were kept in an oxygen free environment in transparent containers, one in total darkness and the other in sunlight. Which one of the two is likely to survive more? Justify your answer by giving the reason.

OR

Explain the type of photophosphorylation that occurs when light of wavelengths beyond 680 nm are available for excitation. (2)

1. How is chemical analysis of organic compounds in a living tissue carried out? (2)
2. Draw a diagram of a lenticel and label any four of its components. (2)
3. What are Cnidoblasts? Where are they present? What are they useful for? (2)

OR

Using a high precision microscope, how will you distinguish between a chrysophyte from a dinoflagellate?

1. What effect will be observed in the foetus of a pregnant lady suffering from hypothyroidism? (2)
2. Explain how crossing over is initiated and completed at the end of pachytene stage.

(2)

1. How are herbarium sheets prepared? What information does the label in the herbarium

sheet provide for taxonomical studies? (2)

SECTION-C

1. (a) What is compound epithelium? What are their main functions?
2. Where do we find areolar tissue?
3. How is adhering junction different from gap junction?

(3) (2)

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