Algae

Q. Which of the following is the function of fungus in the lichen?

1. Fixes the atmospheric nitrogen for the algae
2. Provides protection to the algae
3. Provides food to the algae
4. Releases oxygen for the algae

Q. Hydrophytes are characterised by

1. Short spinous stem.
2. Thick and large leaf.
3. Delicate and mucilagenous stem.
4. All of the above.

Q. Question 45 (h)
Fill in the blanks
(h) Algae and fungi form symbiotic association called ___.

Q. Which of the following is a unicellular algae?
A. Penicillium
B. Aspergillus
C. Chlorella
D. Candida (1 marks)

Q. Match Column I with Column II and select the correct option from the codes given below.

1. a-(i), (iv), (v); b-(iii), (vi); c-(iv), (vii)
2. a-(v), (vi); b-(i), (iii), (vii); c-(ii), (iv)
3. a-(iv), (v); b-(i), (iii), (vi); c-(iv), (vii)
4. a-(v); b-(i), (iii), (vii); c-(ii), (iv), (vi)

Q.

Question 43
Why do not lichens occur in Delhi whereas they commonly grow in Manali or Darjeeling?

Q. What is trypanosoma gambiens ?

Q. Write true or false:
Algae are classified based on their photosynthetic pigments.

Q. Paragraph for below question
नीचे दिए गए प्रश्न के लिए अनुच्छेद

All single celled eukaryotes are placed in kingdom Protista, but the boundaries of this kingdom are not well defined. This kingdom includes chrysophytes, dinoflagellates, euglenoids, slime moulds and protozoans. Members of Protista are primarily aquatic. This kingdom forms a link with the others dealing with plants, animals and fungi. Being eukaryotes, the protistan cell body contains a well defined nucleus and other membrane bound organelles.

Based on the above paragraph answer the following question.

सभी एककोशिकीय यूकैरियोट्स को प्रोटिस्टा जगत में रखा गया है परन्तु इस जगत की सीमा रेखा सु-परिभाषित नहीं हैं। इस जगत में क्रायसोफाइट्स, डायनोफ्लैजिलेट्स, युग्लीनॉइड्स, अवपंक कवक तथा प्रोटोजोअन सम्मिलित हैं। प्रोटिस्टा के सदस्य प्राथमिक रूप से जलीय होते हैं। यह जगत उन जीवों से कड़ी बनाता है जो पादप, जंतु तथा कवक से संबंधित है। यूकैरियोट्स होने के कारण प्रोटिस्टा की कोशिका काय में सु-परिभाषित केंद्रक तथा अन्य झिल्लीबद्ध कोशिकांग होते हैं।

उपरोक्त अनुच्छेद पर आधारित निम्नलिखित प्रश्न का उत्तर दीजिए।

Q. Mark the incorrect option w.r.t. diatoms.

प्रश्न - डायएटम के संदर्भ में गलत विकल्प को चिन्हित कीजिए।

1. They float passively in water currents
   
   ये जलधारा में निष्क्रिय रूप से प्रवाहित होते हैं
2. They are chief producers in the oceans
   
   ये महासागर के मुख्य उत्पादक होते हैं
3. The cell walls are embedded with silica
   
   इनकी कोशिका भित्ति में सिलिका होती है
4. They are biflagellated forms found only in stagnant saline water
   
   ये द्विकशाभिकीय होते हैं जो केवल स्थिर समुद्री जल में पाए जाते हैं

Q. Mitochondria is absent in

1. Green algae
2. Brown algae
3. Blue-green algae
4. Red algae

Q.

Thallophytes are devoid of conducting tissues.

1. True

2. False

Q. What do you mean by biological nitrogen fixation?

1. Conversion of atmospheric nitrogen into useful nitrogen compounds by bacteria and algae.
2. Conversion of nitrogen compounds into ammonia by chemical process.
3. Conversion of atmospheric nitrogen into useful nitrogen compounds by lightning.
4. Conversion of nitrogen compounds into free nitrogen by bacteria and algae.

Q.

Lichens are the associations of:

1. fungus and virus

2. fungus and algae

3. algae and bacterium

4. bacteria and fungus

Q. Which of the following is a unicellular algae?

1. Autotropic

2. Heterotopic

3. Chlorella
4. Candida

Q. Select the features of Protochordates:

1. Radial
2. Marine
3. Triploblastic
4. Invertebrate
5. Vertebrate
6. Coelomate
7. Diploblastic
8. Terrestrial
9. Bilateral
10. Pseudocoelomate

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Briefly descibe the characteristics of thallophyta.

Q. Plants of Bryophyta are

1. Haploid and sporophyte
2. Haploid and gametophyte
3. Diploid and gametophyte
4. Diploid and sporophyte

Q. Which of the following algae is being used in space research?

1. Chlorella
2. Cladophora
3. Hydrodictyon
4. Chlamydomonas

Q. Which algae is commonly called as pond silk or pond scum?

1. Volvox
2. Chlamydomonas
3. Euglena
4. Spirogyra

Q. Most green algae live in

1. Rocky coasts
2. Hot springs
3. Deep seas
4. Fresh water

Q. Chitin is an important cell-wall component in ___________.

1. Algae
2. Fungi
3. Bryophyte
4. Pteridophyte

Q.

Assertion (A): Algae are microscopic thallophytes​

Reason (R): Green, Red and brown are different types of algae​

Directions: Choose the correct option:​

1. Both assertion(A) and reason(R) are true and reason(R) is the correct explanation for assertion(A). ​
2. Both assertion(A) and reason(R) are true, but reason(R) is not the correct explanation for assertion.​
3. Assertion(A) is true and reason(R) is false.​
4. Assertion(A) is false and reason(R) is true.​

Q. Ulothrix occurs in

1. Running fresh water
2. Stagnant fresh water
3. Running salt water
4. Stagnant salt water

Q.

1. Ferns
2. Mosses
3. Liverworts
4. Algae

Q. Laminaria and Fucus are examples of

1. Green algae
2. Brown algae
3. Red algae
4. None of these

Q. The plant body of algae is also called ___________.
A. mycelium
B. thallus
C. rhizoids
D. stolons (1 marks)

Q. Plants that do not have well-differentiated body design fall into the group called .

1. Thallophyta
2. Bryophyta
3. Pteridophyta

Q. Which of the following is wrong about xerophytes?

1. Sunken stomata
2. Small spiny leaves
3. Thick cuticle
4. Large number of stomata

Q. Write characteristics of : (50-100 words)

1. Monera
2. Fungi
3. Protista

Q. Sexual reproduction in Thallophyta takes place by:

1. Isogamy
2. Anisogamy
3. Oogamy
4. Any of the above