Algae

Q.

Write a note on the economic importance of algae?

Q. In Phycomycetes: 1. Asexual reproduction takes place by zoospores (non-motile) or by aplanospores (motile). 2. These spores are exogenously produced in sporangium. 3. A zygospore is formed by fusion of two gametes; if these gametes are similar in morphology (oogamous) or dissimilar (isogamous)
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1. 2 and 3 are incorrect but 2 is correct
2. 1 and 2 are incorrect but 3 is correct
3. All are incorrect
4. 1 is incorrect but 2 and 3 are correct

Q. What is the source of energy for the inhibitants living very deep inside the ocean i.e. more than 500m deep , as sunlight doesn't reach there ?

Q.

How sexual reproduction enables simpler organisms to survive during unfavorable conditions?

Q. Agar is obtained from red algae such as

1. Chlorella and Spirulina
2. Gelidium and Gracilaria
3. Laminaria and Sargassum
4. Anabaena and Volvox

Q.

Find out what do the terms ‘algal bloom’ and ‘red-tides’ signify.

Q. Which of the following is incorrect about cyanobacteria?

1. They are photoautotrophs
2. They lack heterocysts
3. They often form blooms in polluted water bodies
4. They have chlorophyll a similar to green plants

Q.

What is the life cycle of Fucus?

Q. Among the red, brown and green algae which one is likely to be found in deep ocean and why? What is the extent of their presence in terms of depth?

Q. Choose correct option for the given below statements
I. All biennial plants are monocarpic.
II. All perennial plants show an inter flowering phase.
III. All angiosperms produce non-motile gametes.
IV. All sexually reproducing organisms show embryogenesis.

1. I-True, II-True, III- False, IV- True
2. I-False, II-True, III- False, IV- True
3. I-True, II-False, III- True, IV- False
4. I-True, II-False, III- False, IV- True

Q.

What is the difference between phycomycetes and ascomycetes?

Q. Which of the following is a unicellular alga?

1. Volvox
2. Spirogyra
3. Chlorella
4. Fucus

Q.

Which of the following represents the maximum number of species among global biodiversity?

1. Fungi

2. Algae

3. Lichens

4. mosses and ferns

Q.

Chrysophytes include

1. Desmids

2. Golden algae

3. Diatoms

4. All of these

Q.

The major pigments in Phaeophyceae are

1. chlorophyll a and b.

2. chlorophyll a, c and fucoxanthin.

3. chlorophyll a, d and phycoerythrin.

4. chlorophyll a, d and fucoxanthin.

Q.

Which fungi reproduce by zoospores?

Q.

What is the basis of classification of algae?

Q. Agar-agar is commercially obtained from

1. green algae
2. blue-green algae
3. brown algae
4. red algae

Q. Which of the following is a filamentous algae?

1. Volvox
2. Ulothrix
3. Kelp
4. Chlamydomonas

Q. Why do cattle avoid browsing on the plant Calotropis?

1. It produces highly poisonous compound opium
2. It produces poisonous cardiac glycosides
3. It bears thorns
4. Both a and b

Q.

What are the three types of lichens?

Q. Match the items in column I with those in column II:

Column I	Column II
a. Peritrichous flagellation	i. Ginkgo
b. Living fossils	ii. Microcystis
c. Rhizophore	iii. Escherichia coli
d. Smallest flowering plant	iv. Selaginella
e. Algal bloom	v. Wolffia

1. a b c d e
   ii i iii iv v
2. a b c d e
   iv iii ii v i
3. a b c d e
   i iv v iii ii
4. a b c d e
   iii i iv v ii

Q.

Crop plants require a lot of nitrogen to make?

Q. Stored food in red algae is:

1. Cellulose
2. Floridean starch
3. Glycogen
4. Starch

Q.

Methanogens growing anaerobically on cellulosic material produce

1. Methane

2. Methane and hydrogen

3. Methane and carbon dioxide

4. Methane, carbon dioxide and hydrogen.

Q.

Bacterial flagella is made up of

Q. How many species of marine algae are used as food?

Q. Which of the following is the chief pigment associated with photosynthesis ?

1. Chl-a and xanthophylls
2. Chl-a
3. Chl-a and carotenoids
4. Chl-b

Q.

When does the algae and fungi shift to sexual methods of reproduction?

Q.

Are aplanospores motile?