NEET Biology · Flashcards
This deck has 21 flashcards on Structural Organisation in Animals & Plants for NEET Biology, from NCERT Class 11. It covers the NCERT chapters Morphology of Flowering Plants, Anatomy of Flowering Plants and Structural Organisation in Animals.
Covering plant and animal tissues, flowering plant morphology, specific angiosperm families, and the structural organization/anatomy of the frog.
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Card 1 of 21
What are the three distinct regions of a root tip, from the apex upwards?
Hint: Root hairs, which absorb water, arise from the zone of maturation.
Answer
1. Region of Meristematic Activity (cells divide rapidly). 2. Region of Elongation (cells undergo rapid enlargement). 3. Region of Maturation (cells differentiate and mature).
Card 2 of 21
Differentiate between a rhizome, a tuber, and a corm with one example each.
Hint: These are all modifications of the stem for food storage.
Answer
Rhizome: Underground stem that grows horizontally (e.g., Ginger). Tuber: Swollen ends of underground branches (e.g., Potato). Corm: Underground stem that grows vertically (e.g., Colocasia).
Card 3 of 21
Define phyllotaxy and name its three main types.
Hint: Think of how leaves maximize light exposure.
Answer
Phyllotaxy is the pattern of arrangement of leaves on the stem or branch. Types: 1. Alternate (e.g., Mustard) 2. Opposite (e.g., Calotropis) 3. Whorled (e.g., Alstonia)
Card 4 of 21
State the three unique structural features of Cardiac muscle tissue.
Hint: Found only in the heart wall (myocardium).
Answer
1. Striated (shows banding patterns). 2. Involuntary (not under conscious control). 3. Branched fibers connected by intercalated discs (communication junctions allowing the heart to contract as a unit).
Card 5 of 21
What is the main developmental difference between Racemose and Cymose inflorescence?
Hint: Acropetal = Acro (apex) + petal (seeking). Basipetal = Base seeking.
Answer
Racemose: The main axis continues to grow, and flowers are borne laterally in an acropetal succession (youngest at the top). Cymose: The main axis terminates in a flower, limiting growth. Flowers are borne in a basipetal succession (oldest at the top).
Card 6 of 21
What is Axile placentation? Give two examples.
Hint: Cut a tomato horizontally to visualize this.
Answer
In axile placentation, the placenta is axial, and the ovules are attached to it in a multilocular ovary. Examples: China rose, Tomato, Lemon.
Card 7 of 21
Describe the three layers of the pericarp in a drupe fruit (like a mango or coconut).
Hint: Drupes develop from monocarpellary superior ovaries.
Answer
1. Epicarp: Outer thin layer (skin). 2. Mesocarp: Middle fleshy, edible layer (in mango) or fibrous layer (in coconut). 3. Endocarp: Inner stony hard layer enclosing the seed.
Card 8 of 21
What is the defining characteristic of the gynoecium in the family Leguminosae?
Hint: Think of opening a pea pod along its suture.
Answer
The gynoecium is monocarpellary, unilocular with many ovules, and has marginal placentation.
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