Plant Cell and Developmental Biology (DSC — DU B. Sc. Life Science (Botany) Previous Year Question Papers

3. Attempt total four questions including Question No. 1 4. All parts of a question must be attempted together. 5. Draw well-labelled diagrams wherever necessary. 1. (a) Fill in the blanks (any five) : (5x1=5) (i) In wood, elements of xylem are blocked by balloon like ingrowths called (ii) The pollen-kitt substances plays an important role in (iii) Primary cell wall is primarily made of and (iv) Secondary roots originate from layer. (v) proposes the Tunica-corpus theory of shoot apex organization. (vi) Each Golgi stack has two distinct ends, or faces namely and (b) Define the following (any five) : (5x1=5) (i) Open vascular bundles (iii) Differentiation (iv) Cytoplasmic streaming (v) Double fertilization (vi) Non-albuminous seeds (c) State true or false for the following statements (any five) : (5x1=5) (i) Pollen tube entry into ovule through micropyle is known as mesogamy. . (ii) Endocytosis usually does not occur in plant cells due to their rigid cell wall. (iii) Filiform apparatus is present in the central cell of embryo sac. (i:) Dicot leaves are usually dorsi-ventral. (1) Stylar canal is present in solid type of style. (vi) The F-type/H+ATPase is found on the inner mitochondrial membrane in eukaryotes. 2. Differentiate between the following (any three) : (b) Smooth and Rough endoplasmic reticulum (c) Monocot and dicot stem (d) Autogamy and Allogamy 3. Draw well-labelled diagram of the following (any three) : (3×5=15) (a) Ultrastructure of chloroplast (b) Vert cal section of monocot leaf (a part cellular) (c) Pollen wall (d) Types of collenchyma 4. Write short notes on the following (any three: (b) Seed development 5. Answer the following (any two: (2x7.5=15) (a) What is endosperm? Define the types of endosperm based on development. Briefly discuss about embryo-endosperm relationship. (b) Elaborate on Körper -Kappe theory of root apex organization. (c) Discuss anomalous secondary growth in a stem with the suitable example. Answer the following (any five) : (5×3=15) (a) Explain why mitochondria regarded as semi-autonomous cell organelles. Justify your answer. (b) Which stage of dicot embryogenesis exhibits radial organization? Explain in detail. (c) Does plant exhibit polarity in their growth? Discuss your view point. (d) Describe the role of callose in atleast two plant developmental processes. (e) Write a note on structure and functions of trichomes. (f) Define pollen-pistil interactions. What are the steps in the series of pollen-pistil interactions?