NEET Botany MCQs

Which of the following is incorrectly matched?

• Ectocarpus – Fucoxanthin
• Ulothrix – Mannitol
• Porphyra – Floridian Starch
• Volvox – Starch

Hydrocolloid carrageen is obtained from:

• Chlorophyceae and Phaeophyceae
• Phaeophyceae and Rhodophyceae
• Rhodophyceae only
• Phaeophyceae only

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

• Colchicum autumnale
• Pisum sativum
• Allium cepa
• Solanum nigrum

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

• B and C Only
• A and D Only
• B, C, D and E Only
• A, B, D and E Only

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

• A, B and C Only
• B and C Only
• D and E Only
• C, D and E Only

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

• A, B and D Only
• B, C, D and E Only
• A, B, C and D Only
• A, C, D and E Only

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

• A and B Only
• C and D Only
• D and E Only
• B and D Only

Exoskeleton of arthropods is composed of :

• Cutin
• Cellulose
• Chitin
• Glucosamine

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

• Spindle fibres attach to kinetochores of chromosomes.
• Movement of centrioles towards opposite poles.
• Pairing of homologous chromosomes.
• Coiling and condensation of the chromatids.

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

• Synaptonemal complex
• Bivalent
• Sites at which crossing over occurs
• Terminalization