Class 11 Biology - Chapter Morphology of Flowering Plants NCERT Solutions | Sunflower is not a flower. Explain.
Sunflower is not a flower. Explain.
Sunflower is not a flower but it is bunch of flower called inflorescence. It is a type of inflorescence called capitulum which is a modified raceme in which the main axis is flattened known as Receptacle. It may be concave, convex, spherical or flat and bears numerous small sessile flowers called florets. On receptacle two kinds of florets are present:
- Ray florets
- Disc florets
Inflorescence is surrounded by whorl of bracts known as involucre. Ray florets are on the rim of receptacle. These are of yellow colour. Disc florets are in the center and are bisexual and actinomorphic.
More Questions From Class 11 Biology - Chapter Morphology of Flowering Plants
- Q:- Explain with suitable examples the different types of phyllotaxy?
- Q:- What is a flower? Describe the parts of a typical angiosperm flower?
- Q:- Write the floral formula of an actinomorphic bisexual, hypogynous flower with five united sepals, five free petals. Five free stamens and two united carpals with superior ovary and axile placentation.
- Q:- Describe the various types of placentations found in flowering plants.
- Q:- Describe the arrangement of floral members in relation to their insertion on thalamus?
- Q:- Define the term inflorescence. Explain the basis for the different types of inflorescence in flowering plants.
- 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
- Q:- Define the following terms:
(a) Aestivation
(b) Placentation
(c) Actinomorphic
(d) Zygomorphic
(e) Superior ovary
(f) Perigynous flower
(g) Epipetalous Stamen - Q:- How do the various leaf modifications help plants?
- Q:- Describe modifications of stem with suitable examples
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(a) Growth
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(c) Development
(d) De differentiation
(e) Re differentiation
(f) Determinate growth
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(a) fovea
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(c) blind spot
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(b) Parapodia (ii) Mollusca
(c) Scales (iii) Porifera
(d) Comb plates (iv) Reptilia
(e) Radula (v) Annelida
(f) Hairs (vi) Cyclostomata and Chondrichthyes
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