SHORT QUESTION What is middle lamella? Give its role in cell wall. Ans: Each cell has its own cell wall. The cell wall of the adjacent cells is joined by middle lamella. Middle lamella is a thin layer. Cellulose is absent in it. It
I. Describe structure of cell wall. 2. What are pits? Give their structure and types. 3. Give chemical composition of cell wall.
Annular These are ring like thickening. In this case. ring of lignin are deposited one above the other. Scalariform These are ladder like lignin thickenings. Spiral In this case. thickenings are arranged in spiral bands. Reticulate In this case. lignin thickenings form networks Pitted
Structure of cell wall Cell wall is present only in plant cells. Cell wall is non-protoplasmic. It is considered as metabolic byproduct of the protoplast. Cell wall provides support and protection to cell. It also plays an important role in absorption, translocation and secretion.
Multiple Choice Questions (MCQs) 1 .Inflorescence in family Ranunculaceae is: (a) Racemose (b) Head (c) Compound (d) Cymose 2.Number of sepals in family Ranunculaceae is: (a)3 (b) 4 (c) 5 (d) 6 3.Fruit in family Ranunculaceae is: (a) Follicle (b) 1ut ( c )
Give medicinal and condiment uses of family Ranunculaceae: ANS:Medicinal plants: Some members are used as medicinal plants. Aconitwn yields an alkaloid aconitina. Thu ields mamira. It is used in the treatment of ophthahnia. Some members arc used as condiments. For example, seeds of !Vigella.
Give diagnostic characters, distribution and economic importance of family Ranunculaceae. Give diagnostic characters, distribution and economic importance of family Brassicaccae. Similar questions for all the families.
Poaceae (Grass Family) Diagnostic characters Habit: Annual or perennial herbs; rarely tree (bamboos. Roots: Fibious adventitidus. Stem: Herbaceous; cylindrical; jointed, hollow at intemodes. Sometimes, forms rhizome or runner. Leaves: Sessile with long sheathing base; alternate; simple; ligulate; parallel venation. nflorescence: Spike of spikelets or
(Onion Family) Diagnostic characters I. Habit: Mostly annual or biennial herbs. Some plants are xerophytic. Roots: Fibrous adventitious roots. In some cases roots become tuberous. Stem: Herbaceous; fleshy in some plants; aerial braches are erect; some develops underground stem rhizome, corm, bulb etc.
(ASTERACEAE (COMPOSITAE) Sunflower Family) Diagnostic characters Habit: Annual or perennial herbs or small shrubs or small tree or climbers. Roots: Fibrous tap root Stein: Herbaceous; spiny or without spines; cylindrical, hairy. Leaves: Petiolate; alternate or opposite; simple; exstiputate; Inflorescence: Capitulum surrounded at the bases