IGNOU BBYCT-137 June 2022 Previous Year Question Paper

Q1.(a) State whether the following statements are true or false : 4x 5 =2

(i) | The stomatal index is constant for a species and is used as a_ good taxonomic character.

(ii) Turgor pressure of a flaccid cell will be 1.

(iii) Sugars are transported via both apoplastic and symplastic routes.

(iv) Glycolysis can continue even when the supply of NAD* is limited.

(b) Fill in the blanks : 3x1=3 (@) ~Water deficit leads to the of the stomata in day time.

(ii) A short day plant requires more than a critical period of .

(iii) The most preferred element which is translocated by apoplastic pathway is

(c) Define the following terms : 5x1=5 (@) —_Exosmosis

(ii) | Hygroscopic water Gii) Guttation

(iv) Field capacity

(v) Leghemoglobin

Q2.Describe Calvin—Benson cycle with a labelled schematic diagram indicating the sites of ATP and NADPH consumption.

Q3.(a) Describe the three functions of essential elements. 3

(b) List any four macronutrients and describe how the deficiency of any two of these macronutrients affects the plant growth.

Q4.How were gibberellins discovered ? Discuss its bioassays and functions.

Q5.Describe the reactions of TCA cycle indicating the enzymes involved and the sites of ATP synthesis with labelled schematic diagram.

Q6.(a) Discuss phytochrome mediated responses. 5

(b) Define vernalization and discuss its mechanism of action.

Q7.(a) Discuss the significance of transpiration. Describe the mechanism of stomata opening and closing with proper diagram. 5

(b) What is stress ? Discuss various ways adopted by plants to reduce pollutant stress.

Q8.Write short notes on any two of the following : 2x5=10

(a) Abscisic acid

(b) Gifted species

(c) Allosteric enzymes

(d) Agricultural biotechnology FMT ARI FART | BBYCT-137 4

(ii) fargara