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Morphology of Flowering Plants: CBSE Class 11 NCERT Solution

Aug 17, 2015 16:36 IST

    Find the CBSE Class 11 Biology NCERT Solution for the Chapter- 5, Morphology of Flowering Plants. It has been framed keeping the Students' perspective in mind. This will help the Students with easy and simple understanding of the concept and technique employed in solving as per the CBSE Marking Scheme.

    To get the Complete NCERT Solution, Click Here

    Few Sample Question from this Chapter are given below:

    Q. What is meant by modification of root? What type of modification of root is found in the

    (a) Banyan tree (b) Turnip (c) Mangrove trees

    Ans. In some plants the roots change their shape and structure and become modified to serve some functions other than absorption and conduction of water and minerals. Modified roots act as storage sites for food. Some provide support to massive plants, while others help in respiration. Function of modified roots in various plants:

    (a) Banyan tree: The banyan tree has hanging roots arising from its branches which are known as prop roots. These roots go into the soil and provide additional support to the tree.

    (b) Turnip: The roots of turnip are modified to store food.

    (c) Mangrove tree: The roots of mangrove tree grow vertically upwards for the absorption of oxygen from the atmosphere. These roots are called pneumatophores.

    Q. Justify the following statements on the basis of external features

    (i) Underground parts of a plant are not always roots

    (ii) Flower is a modified shoot

    Ans.

    (i) In some plants some of their parts are modified into underground structures to perform some special functions such as storage of food. For example, ginger has an underground stem which is swollen due to storage of food. This type of stem is called rhizome. Similarly, corm is an underground stem in Colocasia and Zamin-khand. The underground stem in potato becomes swollen due to the storage of food and forms tuber. Basal leaves in onions become fleshy due to the accumulation of food.

    Q. Explain with suitable examples the different types of phyllotaxy?

    Ans. Phyllotaxy refers to the pattern or arrangement of leaves on the stem or branch of a plant. There are three types of phyllotaxy which are described as below:

    (i) Alternate phyllotaxy: In this type of phyllotaxy, a single leaf arises from each node of a branch in alternate manner. For example: Sunflower, mustard, and China rose.

    (ii) Opposite phyllotaxy: Plants with opposite phyllotaxy have a pair of leaves arising from each node and both lie in opposite direction to each other. For example: Guava and jamun plants.

    (iii) Whorled phyllotaxy: In this type of phyllotaxy, more than two leaves arise from each node forming a whorl. For example: Alstonia.

    Q. Define the following terms:

    (a) Aestivation

    (b) Placentation

    (c) Actinomorphic

    (d) Zygomorphic

    (e) Superior ovary

    (f) Perigynous flower

    (g) Epipetalous Stamen

    Ans.

    (a) Aestivation: The term ‘aestivation’ refers to the mode of arrangement of sepals or petals in a floral bud with respect to other floral members. There are four types of aestivation in plants- twisted, valvate, imbricate, and vexillary.

    (b) Placentation: The term ‘placentation’ refers to the arrangement of ovules within the ovary of a flower. There are five main types of placentation - marginal, basal, parietal, axile and free central.

    (c) Actinomorphic: A flower that can be divided into two equal radial halves by any radial plane passing through its centre, it is said to be actinomorphic. For example: chilly and mustard.

    (d) Zygomorphic: A flower that can be divided into two equal radial halves by a single vertical plane, it is said t be Zygomorphic. For example: pea and beans.

    (e) Superior ovary: In the hypogynous flower, the gynoecium occupies the highest position, while other floral parts are arranged below it. The ovary in such flowers is said to be superior.For examples: Brinjal and mustard.

    (f) Perigynous flower: A flower, in which the gynoecium is present in the centre and the rest of the floral parts are located on the rim of the thalamus at the same level, is called perigynous flower. For example: plum and rose.

    (g) Epipetalous Stamen: When the stamens are attached to the petals, they are known as epipetalous Stamen. For example: Brinjal.

    To get the Complete NCERT Solution, Click Here

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