Indira Gandhi National Open University (IGNOU) 2003 B.Sc Botany LSE6 Developmental Biology - Question Paper

Bachelor of Science (B.Sc.) - Life Science
Term-End exam

Time: two hours
Maximum Marks: 50
Note : (i) ans Part one and Part II in separate ans copies.

(ii) Draw labelled diagrams wherever necessary.

PART I

Plant

part A

Note : part A is compulsory.

A1. State whether the subsequent statements [(i)-(v)] are actual or false (5)

(i) The function of endothecium is to give nourishment to the microspores.

(ii) Female gametophyte produces triploid embryo and diploid endosperm in angiosperms.

(iii) Schizocarpic fruits are those that develop from multicarpellary ovaries that separate on maturity into individual achenes, every representing a carpel.

(iv) Antipodal cells are absent in oenathera kind of embryo sac.

(v) Potyteny refers to an increase in the number of chromonemata per chromosome.

part B

Note : Attempt any 2 ques..

B1. Distinguish ranging from any 2 of the subsequent pairs (5)

(a) Cellulose and Callose

(b) Parthenocarpy and Parthenogenesis

(c) Orthotropous and Anatropous ovule

(d) Cellular and Helobial endosperm

B2. Draw labelled only diagrams of any 2 of the subsequent : (5)

(a) L.S. of cotton seed (kernel).

(b) Cross part of the fruit of Pyrus malus (apple).

(c) Fine-structure of growing pollen tube.

B3. Attempt any 2 of the subsequent (5)

(a) What is double fertilization ? discuss its significance.

(b) Enumerate the functions of synergids.

(c) elaborate the incompatibility factors and the site of their action in gametophytic and sporophytic incompatibility ?

(d) define the methods for overcoming seed dormancy.

part C

Note : ans all ques..

C1. discuss the significance of apical dominance. elaborate the chemical factors that control apical dominance ?

OR

define the structure and function of pariderm

C2. define how a vegetative apex is transformed into a floral apex.

OR

elaborate the industrial applications of plant cell culture technique ?

PART II

Animal

part A

Note : ans all ques.. Fill in the blanks of ques. A1, A2 and A3.

A1. With respect to the volume of yolk the eggs in eutherian mammals are ____ . (1)

A2. The port of coelom that surrounds the heart in called ____ cavity. (1)

A3. ____ is the ability of malignant cell to detach itself from a tumour and establish a tumour at a different site. (1)

A4. Differentiate ranging from any 2 pairs of the subsequent terms : (2)

(a) Progressive modifications and Regressive modifications

(b) Isogamy and Anisogamy

(c) Holoblastic cleavage and Meroblastic cleavage

part B

Note : ans any 2 of the subsequent ques.. Limit every ans to 200 words.

B1. (a) discuss the term epimorphosis.

(b) define the process of regeneration in Hydra (2 + three = 5)

B2. (a) Name the glands of insect larva that secrete (i) juvenile hormone and (ii) ecdysone.

(b) define the interaction of hormones in the process of insect metamorphosis. (5)

B3. Write short notes on any 2 of the subsequent :

(a) Vital Dye Staining

(b) Involution

(c) Role of hormones in aging

part C

Note : ans any 2 of the subsequent ques.. every ans should not exceed more than 500 words.

C1. With the help of a suitable diagram define the menstrual cycle in a human female. (5)

C2. define the stages of carcinogenesis. (5)

C3. define the process of gastrulation in chick embryo. (5)
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