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11th Standard English Medium Biology (Botany) Subject Plant Kingdom Creative 3 Mark Questions with Solution Part - I

Published on: 25/06/2021

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Std: 11th Standard - Biology

chapter: - Creative Questions

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Questions:

Generic 3

4 x 3 = 12

Discuss the various types of Protostele.

Define Monocotyledons.

The term 'form genera' is used to name fossil plants - Explain.

What is the contribution of prof. Birbal Sahni?

Generic 5

1 x 5 = 5

Differentiate Gymnosperms from Angiosperms.

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Answers Key:

Generic 3

4 x 3 = 12

(i) Inprotostelexylem surrounds phloem. The type includes Haplostele, Actinostele, Plectostele, and mixed protostele.
(ii) Haplostele: Xylem surrounded by phloem is known as haplostele. Example: Selaginella.
(ii) Actinostele: Star shaped xylem core is surrounded by phloem is known as actinostele . Example: Lycopodiumserratum.
(iii) Plectostele: Xylem plates alternates with phloem plates. Example: Lycopodiumclavatum.
(iv) Mixed prototostele: Xylem groups uniformly scattered in the phloem. Example: Lycopodiumcernuum.

1. Seeds of monocotyledonous plants contain only one cotyledon.
2. Leaves show parallel venation.
3. Flowers are trimerous.
4. These plants have fibrous root system.

1. The whole plant is not recovered as fossils.
2. Instead organs or parts of the extinct plants are obtained in fragments.
3. Hence the term 'form genera' is used to name fossil plants

1. He is the father of Indian Palaeobotany.
2. He described fossil plants from Rajmahal Hills of Eastern Bihar.
3. He described many form genera.
Eg : Pentoxylon sahni , Nipanioxylon.

Generic 5

1 x 5 = 5

S.No	Gymnosperms	Angiosperms
1.	Vessels are absent [except Gnetales]	Vessels are present
2.	Phloem lacks companion cells	Companion cells are present
3.	Ovules are naked	Ovules are enclosed within the ovary
4.	Wind pollination only	Insects, wind, water, animals, etc., act as pollinating agents
5.	Double fertilization is absent	Double fertilization is present
6.	Endosperm is haploid	Endosperm is triploid
7.	Fruit formation is absent	Fruit formation is present
8.	Flowers absent	Flowers present