Which of the following is incorrectly matched?

NEET-2022 plant-kingdom [class-xi ]

• Ectocarpus – Fucoxanthin
• Ulothrix – Mannitol
• Porphyra – Floridian Starch
• Volvox – Starch
Correct Option: B  [ Ulothrix – Mannitol ]

Remark:

Hydrocolloid carrageen is obtained from:

NEET-2022 plant-kingdom [class-xi ]

• Chlorophyceae and Phaeophyceae
• Phaeophyceae and Rhodophyceae
• Rhodophyceae only
• Phaeophyceae only
Correct Option: C  [ Rhodophyceae only ]

Remark:

Which one of the following plants shows vexillary aestivation and diadelphous stamens?

NEET-2022 Morphology-of-Flowering-Plants [class-xi ]

• Colchicum autumnale
• Pisum sativum
• Allium cepa
• Solanum nigrum
Correct Option: B  [ Pisum sativum ]

Remark:

Identify the correct set of statements :
A.The leaflets are modified into pointed hard thorns in Citrus and Bougainvillea.
B.Axillary buds form slender and spirally coiled tendrils in cucumber and pumpkin.
C.Stem is flattened and fleshy in Opuntia and modified to perform the function of leaves.
D.Rhizophora shows vertically upward growing roots that help to get oxygen for respiration.
E.Subaerially growing stems in grasses and strawberry help in vegetative propagation.
Choose the correct answer from the options given below :

NEET-2022 Morphology-of-Flowering-Plants [class-xi ]

• B and C Only
• A and D Only
• B, C, D and E Only
• A, B, D and E Only
Correct Option: C  [ B, C, D and E Only ]

Remark:

The flowers are Zygomorphic in:
A. Mustard.
B. Gulmohar.
C. Cassia.
D. Datura.
E. Chilly.
Choose the correct answer from the options given below:

NEET-2022 Morphology-of-Flowering-Plants [class-xi ]

• A, B and C Only
• B and C Only
• D and E Only
• C, D and E Only
Correct Option: B  [ B and C Only ]

Remark:

Read the following statements about the vascular bundles :
A. In roots, xylem and phloem in a vascular bundle are arranged in an alternate manner along the different radii.
B. Conjoint closed vascular bundles do not possess cambium.
C. In open vascular bundles, cambium is present in between xylem and phloem.
D. The vascular bundles of dicotyledonous stem possess endarch protoxylem.
E. In monocotyledonous root, usually there are more than six xylem bundles present.
Choose the correct answer from the options given below :

NEET-2022 Anatomy-of-Flowering-Plants [class-xi ]

• A, B and D Only
• B, C, D and E Only
• A, B, C and D Only
• A, C, D and E Only
Correct Option:   [ None option is correct ]

Remark: All the statements mentioned above are correct regarding vascular bundles.

In old trees the greater part of secondary xylem is dark brown and resistant to insect attack due to:
A. secretion of secondary metabolities and their deposition in the lumen of vessels.
B. deposition of organic compounds like tannins and resins in the central layers of stem.
C. deposition of suberin and aromatic substances in the outer layer of stem.
D. deposition of tannins, gum, resin and aromatic substances in the peripheral layers of stem.
E. presence of parenchyma cells, functionally active xylem elements and essential oils.
Choose the correct answer from the options given below:

NEET-2022 Anatomy-of-Flowering-Plants [class-xi ]

• A and B Only
• C and D Only
• D and E Only
• B and D Only
Correct Option: A  [ A and B Only ]

Remark:

Exoskeleton of arthropods is composed of :

NEET-2022 Biomolecules [class-xi ]

• Cutin
• Cellulose
• Chitin
• Glucosamine
Correct Option: C  [ Chitin ]

Remark:

Which one of the following never occurs during mitotic cell division?

NEET-2022 Cell-Cycle-and-Cell-Division [class-xi ]

• Spindle fibres attach to kinetochores of chromosomes.
• Movement of centrioles towards opposite poles.
• Pairing of homologous chromosomes.
• Coiling and condensation of the chromatids.
Correct Option: C  [ Pairing of homologous chromosomes. ]

Remark:

The appearance of recombination nodules on homologous chromosomes during meiosis characterizes :

NEET-2022 Cell-Cycle-and-Cell-Division [class-xi ]

• Synaptonemal complex
• Bivalent
• Sites at which crossing over occurs
• Terminalization
Correct Option: C  [ Sites at which crossing over occurs ]

Remark: