Phase-contrast microscopy is suitable for observing which kind of sample?

1. Single cells 

2. Group of cells

3. Thin cell layers

4. Thick cell layers

Which of the following options is correct?

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#Question id: 40449

#Botany

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): Nigella is not a member of the family Characeae.

Reason (R): Nigella is a genus of angiosperms (flowering plants) known for producing black cumin seeds, whereas Characeae is an algal family.

In the light of the above statements, choose the correct answer:

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#Question id: 40450

#Botany

Match the Algal genera in List-I with the shape of their Chloroplast in List-II.

List-I (Genera)	List-II (Chloroplast Shape)
A. Chlamydomonas	I. Girdle shaped
B. Spirogyra	II. Reticulate (Network-like)
C. Ulothrix	III. Cup shaped
D. Oedogonium	IV. Ribbon shaped (Spiral)

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#Question id: 40451

#Botany

Given below are two statements regarding the reproduction in Algae:

Statement I: In Rhodophyceae (Red Algae), motile stages (zoospores or motile gametes) are completely absent in their life cycle.

Statement II: In Phaeophyceae (Brown Algae), the gametes are pyriform (pear-shaped) and bear two laterally attached unequal flagella.

Choose the correct answer:

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#Question id: 40452

#Botany

Given below are two statements regarding the economic importance of Algae:

Statement I: Agar-agar, used in microbial culture media, is obtained from Laminaria and Sargassum.

Statement II: Chlorella is a unicellular alga rich in proteins and is used as a food supplement by space travelers.

Choose the correct answer:

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#Question id: 40453

#Botany

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): Chara is known as "Stone Wort."

Reason (R): The plant body of Chara is heavily encrusted with calcium carbonate deposits.

In the light of the above statements, choose the correct answer:

TLS Online TPP Program

#Question id: 40454

#Botany

Given below are two statements regarding the economic importance of Algae:

Statement I: Agar-agar, used in microbial culture media, is obtained from Laminaria and Sargassum.

Statement II: Chlorella is a unicellular alga rich in proteins and is used as a food supplement by space travelers.

Choose the correct answer: