NEET UG Botany-129

Question No:1

Find the mis -match

(A) Conjoint vascular bundles – Xylem and phloem on different radii
(B) Closed Vascular Bundles – Cambium is absent
(C) Radial Vascular Bundles – Xylem and Phloem on different radii
(D) Dicotyledonous stem – Cambium is present

Question No:2

In a dicot root

(A) The vascular bundles are scattered and lack cambium
(B) The vascular bundles are usually arranged in a ring and have cambium
(C) Xylem and Phloem show radial arrangement
(D) Xylem is always end arch

Question No:3

Trichomes of shoot sytem

(A) usually multicellular
(B) may be branched or unbranched
(C) may be soft or sticky
(D) All are related

Question No:4

Where do the casparian bands occur

(A) Endodermis
(B) Epidermis
(C) Pericycle
(D) Phloem

Question No:5

Lateral roots originate from

(A) endodermis
(B) Cortex
(C) Pericycle
(D) Phloem

Question No:6

Vascular cambium produces

(A) Primary and secondary xylem
(B) Primary and secondary phloem
(C) Primary xylem and phloem
(D) Secondary xylem and phloem

Question No:7

After two years of secondary growth the cortex in a dicot root

(A) Remains intact
(B) Completely sloughed off
(C) Is largely lost
(D) Is converted into cork

Question No:8

Which of the following meristem is responsible for growth in circumference of stem or root

(A) Xylem
(B) Phloem
(C) Cortex
(D) Cambium

Question No:9

In leaves, the ground tissue comprises of

(A) Mesophyll, Vascular bundles
(B) Parenchymatous tissue
(C) Only Mesophyll
(D) Mesophyll, xylem parenchyma, phloem parenchyma

Question No:10

Secondary growth in Dicot root occurs with the help of

(A) Lateral meristem, primary meristem, secondary meristem
(B) Lateral meristem, only secondary meristem
(C) Intercalary meristem, only primary meristem
(D) Apical, lateral and intercalary meristems

Question No:11

In dicot root, during secondary growth, vascular cambium is formed from

(A) Only Pericycle
(B) Pericycle present in contact with protoxylem and conjunctive tissue present below the phloem
(C) Complete ring of Pericycle and conjunctive tissue present below the xylem
(D) Complete ring of Pericycle and total conjunctive tissue

Question No:12

Unique feature of secondary growth in dicot root when compared with the stem is

(A) formation of vascular cambium from stellar (tissue in all species
(B) formation of cork cambium from extrastelar tissue in all species
(C) formation of both cork cambium and vascular cambium from stelar tissue in many of the species
(D) formation of vascular cambium from stelar tissue and cork cambium from cortical tissue in many of the species ,

Question No:13

First formed vascular cambial ring of dicot root is

(A) Circular, continuous
(B) Circular, discontinuous
(C) Wavy, non-functional
(D) Wavy, continuous

Question No:14

Match the following
List-I List-II
A) Trichomes I) Cambium
B) Root hairs II) Leaves
C) Mesophyll III) Unicellular
D) Dicotyledonous IV) Epidermal hairs stem


Question No:15

Find out the correct reason for non-existence of sharp annual rings in Secondary dicot root as found in secondary wood of dicot stem.

(A) lack of periclinal divisions in vascular cambium
(B) Production of more secondary xylem to inside and less secondary phloem outside
(C) Relatively less difference in the climate of the soil during different seasons.
(D) un exposure of root to proper wet conditions.

Question No:16

The nature of guard cells cell wall away from and towards the stomatal pore is respectively

(A) Thick, Thin
(B) Thin, Thick
(C) Thin, thin
(D) Thick, thick

Question No:17

Which of the following activity is rare instance in the secondary growth of dicot roots?

(A) Division of vascular cambial cells in periclinal manner
(B) Existence of bipolar divisions in Phellogen cells
(C) Development of Phellogen from cortex
(D) formation of periderm from cork cambium

Question No:18

One can differentiate the nature of guard cells between dicots and grasses by

(A) Its shape
(B) Its secretion of chemicals
(C) Its enzymatic activity
(D) None of these

Question No:19

Cork formed during secondary growth in dicot root, protects the root interior from

(A) pathogens
(B) temperature variations
(C) water
(D) both (a) and (b)

Question No:20

The functional aspect of trichome is

(A) preventing water loss
(B) secretory in nature
(C) Protection
(D) All