Plant structures and tissues Knowledge-Based Download PDF

Questions

1. 1.

   Which specialized photosynthetic tissue in a typical dicot leaf is positioned directly beneath the upper epidermis and consists of columnar, closely packed cells rich in chloroplasts?

   • A) Spongy mesophyll
   • B) Bundle sheath
   • C) Phelloderm
   • D) Palisade mesophyll
2. 2.

   Which cell layer in a plant root contains a waxy, suberin-rich band known as the Casparian strip that prevents the apoplastic passage of water and dissolved minerals into the vascular cylinder?

   • A) Cortex
   • B) Endodermis
   • C) Pericycle
   • D) Epidermis
3. 3.

   Which plant ground tissue consists of elongated living cells with unevenly thickened, non-lignified primary cell walls that provide flexible mechanical support to young stems and leaf petioles?

   • A) Collenchyma
   • B) Parenchyma
   • C) Sclerenchyma
   • D) Epidermis
4. 4.

   Which plant cell type remains alive at functional maturity but lacks a nucleus, relying on adjacent companion cells for metabolic support during nutrient transport?

   • A) Tracheid
   • B) Sieve-tube element
   • C) Vessel element
   • D) Sclereid
5. 5.

   Which plant tissue is composed of cells with heavily lignified secondary cell walls that typically undergo programmed cell death at maturity to provide rigid mechanical support?

   • A) Sclerenchyma
   • B) Collenchyma
   • C) Parenchyma
   • D) Meristem