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Answer key

Prepared by: learnloophq@gmail.com

Last edited 25 days ago by Learn LoopHQ.

Chapter: 01. The Leaf

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Answer Key

Section A: Multiple Choice Questions (10 Marks)

(b) Carbon dioxide

(b) Bladderwort

(d) Buds on leaf margins

Section B: Fill in the Blanks (8 Marks)

Father of Taxonomy

leaf base

venation

rachis

glucose, starch

stomata

Scale

nitrogen

Section C: True/False Questions (6 Marks)

True

False (Monocot plants have sessile leaves)

False (The lamina can be partially incised)

True

False (Most green plants get nitrogen from the soil; insectivorous plants supplement due to poor soil.)

False (Vegetative propagation is a form of asexual reproduction)

Section D: Identifying and Differentiating Concepts (6 Marks)

Differentiate between Reticulate Venation and Parallel Venation. (3 Marks)

Reticulate Venation: In this type, veins and veinlets form a net-like pattern throughout the leaf lamina. It is characteristic of dicot plants, such as Peepal and Mango.

Parallel Venation: In this type, veins run parallel to each other, typically from the base to the apex of the leaf without forming a network. It is characteristic of monocot plants, such as Banana and Maize.

Differentiate between a Simple Leaf and a Compound Leaf. (3 Marks)

Simple Leaf: A simple leaf has a single, undivided leaf blade (lamina), even if it’s partially cut, the incisions do not reach the midrib. An axillary bud is present in its axil. Examples include Mango and Peepal.

Compound Leaf: A compound leaf has its leaf blade completely divided into several smaller, separate units called leaflets, which are attached to a common stalk called the rachis. An axillary bud is present in the axil of the rachis, not individual leaflets. Examples include Rose and Neem.

Section E: Short Answer Questions (10 Marks)

What is the role of the midrib and veins in a leaf?

The midrib forms the central axis of the leaf lamina. Together with the veins and veinlets, it provides structural support to the leaf blade, ensuring it remains flat. They also play a crucial role in transporting water and minerals throughout the lamina and moving the food prepared by the leaf to other parts of the plant.

Briefly explain why leaves are called the “food factories” of a plant.

Leaves are called “food factories” because they are the primary sites where plants produce their own food through photosynthesis. They contain chlorophyll to capture sunlight, and they absorb carbon dioxide and water, which are the raw materials converted into glucose (food).

How does the process of transpiration help the plant absorb water from the soil?

Transpiration, the evaporation of water from leaves, creates a “pull” or suction force within the plant. This suction helps to draw water and dissolved minerals upwards from the roots in the soil, through the stem, and into the leaves, supporting continuous water absorption.

Why are the leaves of cactus plants modified into spines?

The leaves of cactus plants are modified into spines primarily to reduce water loss. Cacti live in dry desert environments, and spines have a much smaller surface area than flat leaves, minimizing the amount of water lost through transpiration. Spines also offer protection against grazing animals.

Mention two plants that can propagate vegetatively from their leaves.

Two plants that can propagate vegetatively from their leaves are Bryophyllum and Begonia.

Section F: Diagram-Based Question (5 Marks)

Observe the image below showing two different types of leaves.

{

"image_description": "A side-by-side comparison of two green leaves. The leaf on the left has multiple distinct leaflets attached along a central stalk (rachis). The leaf on the right is a single, broad, and undivided leaf blade with an obvious petiole.",

"style": "Simple, clear botanical illustration, green leaves on a white background",

"elements_to_include": ["Compound leaf (e.g., rose leaflet structure)", "Simple leaf (e.g., mango leaf shape)", "rachis", "petiole", "stem connection point (optional)"],

"keywords_for_ai_generator": ["simple leaf vs compound leaf", "leaf types diagram", "botany illustration", "plant parts"]

}

(a) Identify what each picture represents (Left leaf, Right leaf). (2 Marks)

Left leaf: Compound leaf

Right leaf: Simple leaf (b) Give one example for each type of leaf. (2 Marks)

Compound leaf example: Rose (or Neem, Tamarind)

Simple leaf example: Mango (or Peepal, Guava) © Which type of leaf typically has an axillary bud at the base of its entire leaf structure? (1 Mark)

Simple leaf

Section G: Environmental Awareness / Everyday Use (5 Marks)

Why is it important for us to protect green plants and forests? Give at least two reasons. (3 Marks)

It is important to protect green plants and forests because they produce the oxygen we breathe, absorb harmful carbon dioxide from the atmosphere, provide food and shelter for many animals, and are a source of medicines, wood, and other valuable resources. (Any two good reasons suffice).

Name two everyday things we get from plants, other than food. (2 Marks)

Two everyday things we get from plants, other than food, are oxygen (for breathing) and medicines. (Other examples: wood for furniture/buildings, cotton for clothes, paper, rubber, spices, oils, flowers for decoration).

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