Which of the following is incorrect about Cynobacteria?

NEET-(Oct)2020 [Biological-Classification] [class-xi ]

• They are photoautotrophs
• They lack heterocysts
• They often form blooms in polluted water bodies
• They have chlorophyll A similar to green plants
Correct Option: B  [ They lack heterocysts ]

Remark:

The size of Pleuropneumonia - like Organism (PPLO) is:

NEET-(Oct)2020 [Biological-Classification] [class-xi ]

• 0.02 µm
• 1-2 µm
• 10-20 µm
• 0.1 µm
Correct Option: D  [ 0.1 µm ]

Remark:

Phycoerythrin is the major pigment in:

NEET-(Oct)2020 [plant-kingdom] [class-xi ]

• Red algae
• Blue green algae
• Green algae
• Brown algae
Correct Option: A  [ Red algae ]

Remark:

Which of the following statements is incorrect about gymnosperms?

NEET-(Oct)2020 [plant-kingdom] [class-xi ]

• They are heterosporous
• Male and female gametophytes are free living
• Most of them have narrow leaves with thick cuticle
• Their seeds are not covered
Correct Option: B  [ Male and female gametophytes are free living ]

Remark:

Male and female gametophytes do not have an independent free living existence in:

NEET-(Oct)2020 [plant-kingdom] [class-xi ]

• Pteridophytes
• Algae
• Angiosperms
• Bryophytes
Correct Option: C  [ Angiosperms ]

Remark:

Which of the following options does correctly represent the characteristic features of phylum Annelida?

NEET-(Oct)2020 [Animal-Kingdom] [class-xi ]

• Triploblastic, unsegmented body and bilaterally symmetrical.
• Triploblastic, segmented body and bilaterally symmetrical.
• Triploblastic, flattened body and acoelomate condition.
• Diploblastic, mostly marine and radially symmetrical.
Correct Option: B  [ Triploblastic, segmented body and bilaterally symmetrical. ]

Remark:

Match the following group of organisms with their respective distinctive characteristics and select the correct option :

NEET-(Oct)2020 [Animal-Kingdom] [class-xi ]

• (A)-(III), (B)-(IV), (C)-(I), (D)-(II)
• (A)-(II), (B)-(III), (C)-(IV), (D)-(I)
• (A)-(IV), (B)-(I), (C)-(II), (D)-(III)
• (A)-(I), (B)-(II), (C)-(III), (D)-(IV)
Correct Option: A  [ (A)-(III), (B)-(IV), (C)-(I), (D)-(II) ]

Remark:

Match the following columns and select the correct option:

NEET-(Oct)2020 [Animal-Kingdom] [class-xi ]

• (A)-(III), (B)-(IV), (C)-(II), (D)-(I)
• (A)-(III), (B)-(IV), (C)-(I), (D)-(II)
• (A)-(IV), (B)-(I), (C)-(II), (D)-(III)
• (A)-(II), (B)-(I), (C)-(IV), (D)-(III)
Correct Option: C  [ (A)-(IV), (B)-(I), (C)-(II), (D)-(III) ]

Remark:

All vertebrates are chordates but all chordates are not vertebrates, why?

NEET-(Oct)2020 [Animal-Kingdom] [class-xi ]

• Notochord is replaced by vertebral column in adult of some chordates.
• Ventral hollow nerve cord remains throughout life in some chordates.
• All chordates possess vertebral column.
• All chordates possess notochord throughout their life.
Correct Option: A  [ Notochord is replaced by vertebral column in adult of some chordates. ]

Remark:

Large, empty colourless cells of the adaxial epidermis along the veins of grass leaves are:

NEET-(Oct)2020 [Morphology-of-Flowering-Plants] [class-xi ]

• Lenticels
• Guard cells
• Bundle sheath cells
• Bulliform cells
Correct Option: D  [ Bulliform cells ]

Remark: