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Important Questions Class 11 Biology Chapter 5 Morphology Flowering Plants

Morphology of flowering plants deals with the study of the form and structure of plants. The flowering plants are also known as angiosperms. They appear in a variety of size, shape, and forms. The morphological structures of flowering plants include the roots, the stem, leaves, flowers. The roots form the underground part of the plant and absorb water and nutrients from the soil. The stem grows above the soil. The leaves contain chlorophyll which helps in the synthesis of food. They also bear pores for transpiration.

Q.1. How do the roots of the plants growing in swamps and marshes obtain their oxygen? A.1.  The roots of the plants growing in swamps and marshes grow vertically upwards and respire. They become negatively geotropic. Q.2. Name some modifications of plant parts for the purpose of photosynthesis. A.2.  The stem gets modified into a leaf-like structure to carry out photosynthesis. In plants like Trapa and Tinospora, the roots grow out of the soil and develop chlorophyll to perform photosynthesis. Q.3. What are the edible parts of ginger and onion? A.3.  The modified stem is the edible part of ginger. All the food material is stored here. The fleshy leaves of onion are the edible parts. Q.4. Differentiate between pinnately compound leaf and palmately compound leaf? A.4.

Q.5. Explain different types of phyllotaxy with suitable examples. A.5.  The pattern in which the leaves are arranged on the stem is known as phyllotaxy. These are of three types:

Q.6. Describe the modifications of the stem. Give examples for the same. A.6.  Modifications of the stem are as follows:

Q.7. Which two roots develop from different parts of the angiosperm plant other than the radicle? A.7.  Prop roots of the banyan tree- Develop from lower nodes of the stem of the tree Stilt roots in sugarcane- Arise from lower nodes of the stem and penetrate the soil. Both the roots are meant to provide support. Q.8. Differentiate between the roots of aquatic plants and terrestrial plants. A.8.

Q.9. What role do the roots of the aquatic plants play? A.9.  The roots are green and branched in plants like Trapa and Tinospora. This provides an increased photosynthetic area for the plants. They get inflated because the air projects out of the water, which helps the plant in floating and gaseous exchange. Q.10. Name the floral parts of an angiosperm. Also, mention their arrangements. A.10.  Following are the floral parts of a typical angiosperm:

Q.11. Why is the maize grain considered as a fruit and not as a seed? A.11.  The maize grain is a ripened ovary with a ripened ovule. That is why it is considered a fruit and not as a seed. The fruit is known as a caryopsis. In this, the per carp is fused with the seed coat. Q.12. Ginger grows underground like any other root. Then why is it considered a stem and not root? A.12.  Ginger is an underground modification of stem which bears internodes, nodes, buds and scaley leaves that give rise to aerial shoots. The lower surface of the nodes gives rise to adventitious roots. Also, it does not play any role in anchorage and absorption. It only serves as a reservoir to store food. This proves that ginger is a stem, not a root. Q.13. Why is sunflower not a flower? A.13.  Sunflower is a kind of inflorescence called capitulum with a flat receptacle. It has sessile and small florets. The oldest floret lies in the periphery while the youngest lies in the centre. The cluster of florets is surrounded by bracts. The florets are of two types; ray florets and disc florets. Q.14. Differentiate between the hypogeal germination and epigeal germination. A.14.

Q.15. Mention the role of cotyledons and endosperm in seed germination. A.15.  The cotyledons and endosperm store food material. The seed imbibes water and activates the enzyme. These enzymes hydrolyze the reserve food material and provide it to the germinating seed. Q.16.  What are Adventitious roots? A.16.  The roots developed from different parts of the plant other than radicle are called as the Adventitious roots. Q.17.  Which is the edible part of the ginger plant? A.17.  Rhizome. Q.18. What is Venation? A.18. Venation is the arrangement of veins in a leaf of a plant. Q.19. Which is the edible part in onion plant? A.19. Fleshy scale leaves. Q.20. Where does woad come from? A.20. Woad, also called as the Isatis tinctoria or the blue dye. It is a flowering plant of the family Brassicaceae known as Asp of Jerusalem. Woad is produced from the leaves of the plant. Q.21. Explain  why maize grain is called as a fruit and not a seed? A.21. Maize grain is usually called as a fruit and not a seed because they are borne or produced from the ripened ovary located within the grass Inflorescence. Q.22. Explain why  sunflower is not considered as a flower? A.22. Sunflower,  a group of herbaceous plants from family Asteraceae and genus Helianthus are not considered as a flower because of it lacks either the male (Stamens) or the female organs (Pistils) or the gametes.    

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The midrib of the leaves is present on a common axis called the rachis.

Leaflets are attached at the tip of the petiole.

Vascular bundles are poorly developed.

Vascular bundles are well developed.

They are modified to perform photosynthesis, food storage and gaseous exchange.

Anchors the plant firmly in the soil, and absorbs nutrients from the soil.

Rapid growth and elongation of epicotyl.

Rapid growth and elongation of the hypocotyl.

The seed cotyledons are inside the soil.

The seed cotyledons are above the soil.

Cotyledons are not green and non-photosynthetic.

Cotyledons are green and photosynthetic.