This set of Class 11 Biology Chapter 3 Multiple Choice Questions & Answers (MCQs) focuses on “Plant Kingdom – Algae-2”.
1. Which of the following modes are used by spirogyra to reproduce?
a) Fragmentation
b) Multiple fission
c) Spore formation
d) Binary fission
View Answer
Explanation: In fragmentation, a parent organism breaks into a fragment and each fragment gives a new individual. Spirogyra uses fragmentation to reproduction.
2. During unfavourable conditions, the outer layer that is formed in chlamydomonas is called as ______
a) Cyst
b) Nuclear membrane
c) Cell wall
d) Cellular membrane
View Answer
Explanation: During unfavourable conditions, an outer layer that is formed outside chlamydomonas is called cyst. These unfavourable conditions allow multiple fission inside the cyst.
3. Which among the following is an incorrect statement?
a) Multiple fission is a process through which many individuals are produced by repeated nuclear division
b) Multiple fission takes place under suitable conditions
c) During multiple fission, an outer layer called cyst is formed
d) Nucleus divides repeatedly and new individuals are formed inside the cyst after which cyst breaks to release new individuals
View Answer
Explanation: Multiple fission is a process through which many individuals are produced by repeated nuclear division. Multiple fission takes place under unfavourable conditions. During multiple fission, an outer layer called cyst is formed. Nucleus divides repeatedly and new individuals are formed inside the cyst after which cyst breaks to release new individuals.
4. Which among the following is an incorrect statement?
a) Most of the algae reproduce using spore formation
b) Asexual spores are called as zoo-spores and the reproductive part in algae is called zoosporangium
c) Under favourable conditions, these organisms germinate to form new organism
d) Zoo-spores are non-motile and flagellated
View Answer
Explanation: Most of the algae reproduce using spore formation. Asexual spores are called as zoo-spores and the reproductive part in algae is called zoosporangium. Under favourable conditions, these organisms germinate to form new organism. Zoo-spores are motile and flagellated.
5. Reproduction in humans is an example of _______
a) Isogamous
b) Anisogamous
c) Oogamous
d) Sapiogamous
View Answer
Explanation: In oogamous mode of reproduction, the larger gamete is non-motile and smaller gamete is motile. In humans, sperms being the smaller gamete are motile and the egg being the larger gamete is non-motile. Therefore, reproduction in humans is an example of oogamous reproduction.
6. The male gamete in sexual reproduction of algae is called as _______
a) Antherozoid
b) Egg
c) Basidiogamete
d) Zoosperm
View Answer
Explanation: The male gamete in sexual reproduction of algae is called antherozoid and the female gamete is called egg. These two gametes fuse to form a zygote which will further develop to form spores.
7. Gelidium and Gracilaria is used in the formation of _______
a) Agar
b) Vinegar
c) Yoghurt
d) Beer
View Answer
Explanation: Gelidium and Gracilaria is used in the formation of Agar. Agar is used in the preparation of ice-creams and jellies. Apart from the preparation of ice-creams, agar has different uses in both industries and in research.
8. Which among the following is incorrect?
a) Algae help in increasing oxygen levels in the environment
b) Chlorella and Spirullina are multi-cellular algae that are rich proteins and are used as food supplements for space travelers
c) Chlorophyceae comprise algae that contain chlorophyll a and chlorophyll b
d) Chlorophyceae store food as proteins, starch or as oil droplets
View Answer
Explanation: Algae help in increasing oxygen levels in the environment. Chlorella and Spirullina are multi-cellular algae that are rich proteins and are used as food supplements for space travelers. Chlorophyceae comprise algae that contain chlorophyll a and chlorophyll b. Chlorophyceae store food as proteins, starch or as oil droplets.
9. The storage bodies present in chloroplasts of chlorophyceae are called as ________
a) Pyrenoids
b) Carragen
c) Stroma
d) Alga
View Answer
Explanation: In chlorophyceae, chloroplasts contain storage bodies called Pyrenoids. Pyrenoids consists of proteins and starch. Chlorophyceae sometimes store food as oil droplets.
10. The color in Phaecophyceae depends on the amount of xanthophyll and fucoxanthin.
a) True
b) False
View Answer
Explanation: The color in Phaecophyceae depends on the amount of xanthophylls and fucoxanthin. Their colors vary from olive green to different shades of brown depending on the amount of pigments present.
11. Food is stored in Phaecophyceae as ___________
a) Starch
b) Laminol
c) Glucose
d) Fructose
View Answer
Explanation: In Phaecophyceae, food is stored in the form of complex carbohydrates like laminol and manitol. Sometimes food is also stored as oil droplets in phaecophyceae.
12. A leaf like photosynthetic organ in Phaecophyceae is called as ________
a) Frond
b) Stipe
c) Holdfast
d) Algin
View Answer
Explanation: The vegetative cells in Phaecophyceae are made up of two layers with the inner one being made of cellulose and the other being made of gelatinous coating of algin. A leaf like photosynthetic organ in Phaecophyceae is called as frond. They also have a stalk called stipe and a substratum called as holdfast.
13. Rhodophyceae is also called as red algae because of the presence of a pigment called r-phycoerythrin.
a) True
b) False
View Answer
Explanation: Rhodophyceae are also called as red algae because of the presence of a red pigment called r-phycoerythrin. They are mostly found in marine water and float on the surface of the water.
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