MCQ - Class 11 Biology Unit 2

 NCERT Class 11 Biology Unit 2 (Structural Organisation in Plants and Animals) for the 2025-26 academic year.

Multiple Choice Questions (MCQs)

 * Which of the following is a characteristic feature of a stem?

   a) Presence of root cap

   b) Unicellular root hairs

   c) Bears nodes and internodes

   d) Develops from radicle

   Answer: c) Bears nodes and internodes

   Reasoning: Root cap and root hairs are root features. Radicle gives rise to roots. Nodes and internodes are characteristic of stems.

 * In which type of venation do veins and veinlets form a network?

   a) Parallel venation

   b) Reticulate venation

   c) Both a and b

   d) Neither a nor b

   Answer: b) Reticulate venation

   Reasoning: Reticulate venation is characterized by a network of veins and veinlets, typically found in dicot leaves. Parallel venation involves veins running parallel to each other.

 * The type of placentation where the ovules are borne on the central axis and the septa are absent is called:

   a) Marginal

   b) Axile

   c) Parietal

   d) Free central

   Answer: d) Free central

   Reasoning: In free central placentation, ovules develop on a central axis without septa. Marginal, axile, and parietal placentation types have different arrangements with or without septa.

 * Which plant tissue is responsible for storage, photosynthesis, and secretion, and is composed of isodiametric cells?

   a) Collenchyma

   b) Sclerenchyma

   c) Parenchyma

   d) Xylem

   Answer: c) Parenchyma

   Reasoning: Parenchyma is a simple permanent tissue with diverse functions including storage, photosynthesis, and secretion, and typically consists of isodiametric cells. Collenchyma provides mechanical support, sclerenchyma provides rigidity, and xylem is involved in water conduction.

 * The outermost protective layer of a plant body, forming the epidermal tissue system, is covered by a waxy layer called the:

   a) Stomata

   b) Cuticle

   c) Root cap

   d) Lenticel

   Answer: b) Cuticle

   Reasoning: The cuticle is a waxy layer on the epidermis that helps in reducing water loss. Stomata are pores for gas exchange, root cap protects the root tip, and lenticels are pores on stems.

 * Which of the following animal tissues is characterized by a free surface facing either a body fluid or the outside environment and provides a covering or lining?

   a) Connective tissue

   b) Epithelial tissue

   c) Muscular tissue

   d) Neural tissue

   Answer: b) Epithelial tissue

   Reasoning: Epithelial tissue forms coverings and linings, always having a free surface. Connective tissue connects and supports, muscular tissue contracts, and neural tissue conducts impulses.

 * Which type of connective tissue contains chondrocytes and provides support and flexibility, found in the tip of the nose and outer ear joints?

   a) Bone

   b) Adipose tissue

   c) Cartilage

   d) Blood

   Answer: c) Cartilage

   Reasoning: Cartilage is a specialized connective tissue containing chondrocytes, known for its support and flexibility. Bone is rigid, adipose tissue stores fat, and blood is a fluid connective tissue.

 * The structural and functional unit of neural tissue is the:

   a) Neuroglia

   b) Neuron

   c) Axon

   d) Dendrite

   Answer: b) Neuron

   Reasoning: Neurons are the excitable cells that transmit nerve impulses and are considered the structural and functional units of the neural system. Neuroglia are supporting cells.

 * In Frog, the digestive system is characterized by the presence of a cloaca, which is a common chamber for:

   a) Digestive waste only

   b) Urine only

   c) Reproductive products only

   d) Digestive waste, urine, and reproductive products

   Answer: d) Digestive waste, urine, and reproductive products

   Reasoning: The cloaca in frogs is a common chamber that receives fecal matter, urine, and gametes before they are released to the exterior.

 * Which of the following is a function of the skin in Frog?

   a) Primary site of digestion

   b) Excretion of urea

   c) Respiration

   d) Regulation of body temperature internally

   Answer: c) Respiration

   Reasoning: Frog's moist skin is a significant site for cutaneous respiration, especially when submerged in water. Digestion occurs in the alimentary canal, and while some waste

 passes through the cloaca, the skin's primary respiratory role is key.

Comments

  1. Anonymous8 October 2025 at 11:10

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    Neet World

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