In Class 11 Final Exams there will be Case studies and Passage Based Questions will be asked, So practice these types of questions. Study Rate is always there to help you. Free PDF Download of CBSE Class 11 Biology Chapter 5 Case Study and Passage Based Questions with Answers were Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 11 Biology Morphology of Flowering Plants to know their preparation level.
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In CBSE Class 11 Biology Paper, There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.
Morphology of Flowering Plants Case Study Questions With answers
Here, we have provided case-based/passage-based questions for Class 11 Biology Chapter 5 Morphology of Flowering Plants
Case Study/Passage-Based Questions
Case Study 1:
The leaf is a lateral, flattened structure borne on the stem. It develops at the node and bears a bud in its axil. The axillary bud later develops into a branch. Leaves originate from shoot apical meristems and are arranged in an acropetal order. They are the most important vegetative organs for photosynthesis.
A typical leaf consists of three main parts: leaf base, petiole and lamina. The leaf is attached to the stem by the leaf base and may bear two lateral small leaf like structures called stipules. In monocotyledons, the leaf base expands into a sheath covering the stem partially or wholly. In some leguminous plants the leaf base may become swollen, which is called the pulvinus. The petiole help hold the blade to light. Long thin flexible petioles allow leaf blades to flutter in wind, thereby cooling the leaf and bringing fresh air to leaf surface. The lamina or the leaf blade is the green expanded part of the leaf with veins and veinlets. There is, usually, a middle prominent vein, which is known as the midrib. Veins provide rigidity to the leaf blade and act as channels of transport for water, minerals and food materials. The shape, margin, apex, surface and extent of incision of lamina varies in different leaves.
The arrangement of veins and the veinlets in the lamina of leaf is termed as venation. When the veinlets form a network, the venation is termed as reticulate. When the veins run parallel to each other within a lamina, the venation is termed as parallel. Leaves of dicotyledonous plants generally possess reticulate venation, while parallel venation is the characteristic of most monocotyledons.
A leaf is said to be simple, when its lamina is entire or when incised, the incisions do not touch the midrib. When the incisions of the lamina reach up to the midrib breaking it into a number of leaflets, the leaf is called compound. The compound leaves may be of two types. In a pinnately compound leaf a number of leaflets are present on a common axis, the rachis, which represents the midrib of the leaf as in neem. In palmately compound leaves, the leaflets are attached at a common point, i.e., at the tip of petiole, as in silk cotton.
Phyllotaxy is the pattern of arrangement of leaves on the stem or branch. If is of three types – alternate, opposite and whorled. In alternate type of phyllotaxy, a single leaf arises at each node in alternate manner, e.g. China rose, sun flower plants. In opposite type, a pair of leaves arise at each node and lie opposite to each other as in Calotropis and guava plants. If more than two leaves arise at a node and form a whorl, it is called whorled, e.g. Alstonia.
1.) The arrangement of veins and the veinlets in the lamina of leaf is termed as
- a.) Phyllotaxy
- b.) Venation
- c.) Reticulate venation
- d.) Parallel venation
Ans: b.) Venation
2.) The leaf attached to the stem by the leaf base and may bear two lateral small leaf like structures termed as
- a.) Petiole
- b.) Lamina
- c.) Stipules
- d.) Pulvinus
Ans: c.) Stipules
3.) Explain different parts of typical leaf.
Ans: A typical leaf consists of three main parts: leaf base, petiole and lamina.
o Leaf base – The leaf is attached to the stem by the leaf base and may bear two lateral small leaf like structures called stipules. In monocot, the leaf base expands into a sheath covering the stem partially or wholly. In some leguminous plants the leaf base may become swollen, which is called the pulvinus.
o Petiole – The petiole help hold the blade to light. Long thin flexible petioles allow leaf blades to flutter in wind, thereby cooling the leaf and bringing fresh air to leaf surface.
o Lamina – The lamina or the leaf blade is the green expanded part of the leaf with veins and veinlets. There is, usually, a middle prominent vein, which is known as the midrib. Veins provide rigidity to the leaf blade and act as channels of transport for water, minerals and food materials.
4.) Explain types of venation with suitable examples.
Ans:Venation is the arrangement of veins and the veinlets in the lamina of leaf is termed as venation.
o Reticulate venation – When the veinlets form a network, the venation is termed as reticulate. Leaves of dicotyledonous plants generally possess reticulate venation.
o Parallel venation – When the veins run parallel to each other within a lamina, the venation is termed as parallel, while parallel venation is the characteristic of most monocotyledons.
5.) Explain different types of phyllotaxy with suitable examples.
Ans: The pattern in which the leaves are arranged on the stem is known as phyllotaxy. These are of three types:
o Alternate Phyllotaxy- The leaf arises from each node in an alternate manner. For eg. China rose, sunflower.
o Opposite Phyllotaxy- The leaves arising at each node lie opposite to each other. For eg., Calotropis
o Whorled Phyllotaxy– More than two leaves arise at each node and form a whorl. For eg., Alstonia
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