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Write a note on economic importance of algae and gymnosperms.
Biology
Biology

Class 11

NCERT

Publisher:
NCERT
Subject:
Biology
1

Chapter 1: The Living World

11 questions

arrow
2

Chapter 2: Biological Classification

12 questions

arrow
3

Chapter 3: Plant Kingdom

12 questions

Q1
Mention the ploidy of the following:
1. Protonemal cell of a moss
2. Primary endosperm nucleus in dicot 
3. Leaf cell of a moss
4. Prothallus cell of a fern
5. Gemma cell in Marchantia
6. Meristem cell of a monocot 
7. Ovum of a liverwort 
8. Zygote of a fern
Q2
Write a note on economic importance of algae and gymnosperms.
Q3
Both gymnosperms and angiosperms bear seeds, then why are they classified separately?
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4

Chapter 4: Animal Kingdom

15 questions

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5

Chapter 5: Morphology of Flowering Plants

15 questions

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6

Chapter 6: Anatomy of Flowering Plants

12 questions

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7

Chapter 7: Structural Organization in Animals

14 questions

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8

Chapter 8: Cell: The Unit of Life

14 questions

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9

Chapter 9: Biomolecules

15 questions

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10

Chapter 10: Cell Cycle and Cell Division

16 questions

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11

Chapter 11: Transport in Plants

16 questions

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12

Chapter 12: Mineral Nutrition

10 questions

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13

Chapter 13: Photosysnthesis in Higher Plants

9 questions

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14

Chapter 14: Respiration in Plants

12 questions

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15

Chapter 15: Plant Growth and Development

11 questions

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16

Chapter 16: Digestion and Absorption

15 questions

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17

Chapter 17: Breathing and Exchange of Gases

14 questions

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18

Chapter 18: Body Fluids and Circulation

14 questions

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19

Chapter 19: Excretory Products and their Elimination

12 questions

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20

Chapter 20: Locomotion and Movement

10 questions

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21

Chapter 21: Neural Control and Coordination

12 questions

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22

Chapter 22: Chemical Coordination and Integration

9 questions

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Question
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Write a note on economic importance of algae and gymnosperms.

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Book:

Biology (NCERT)

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Algae have diverse economic uses. They perform half of the total carbon dioxide-fixation on earth by photosynthesis, acting as the primary producers in aquatic habitats.
(a) Food source: Many species of marine algae such as Porphyra, Sargassum, and Laminaria are edible. Chlorella and Spirulina are rich in proteins. Thus, they are used as food supplements.
(b) Commercial importance: Agar is used in the preparation of jellies and ice-cream. It is obtained from Gelidium and Gracilaria. Carrageenin is used as an emulsifier in chocolates, paints, and toothpaste. It is obtained from the red algae.
(c) Medicines: Many red algae such as Corallina are used in treating worm infections.

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Question Text
Write a note on economic importance of algae and gymnosperms.
TopicPlant Kingdom
SubjectBiology
ClassClass 11
Answer TypeText solution:1
Upvotes44