Question No:1

Organisms of same species living in an area are called

(A) Population
(B) Community
(C) Fauna
(D) Flora

Question No:2

Classification of plants into hydrophytes, mesophytes and xerophytes was suggested by

(A) Odum
(B) Warming
(C) Weaver
(D) Misra

Question No:3

The basis of classification of plant communities into hydrophytes, mesophytes and xerophytes is

(A) Tolerence to light
(B) Availability of 7water
(C) Tolerence to temparature
(D) Tolerence to frost and rain

Question No:4

Suspended hydrophyte leading insectivorus life is

(A) Ceratophyllum
(B) Utricularia
(C) Dionaea
(D) Nepenthes

Question No:5

Plant floating on water and useful as biofertiliser in rice fields is

(A) Azolla
(B) Lemna
(C) Wolffia
(D) Salvinia

Question No:6

The chief anatomical feature of all hydrophytes is

(A) Absence of stomata
(B) Sunken stomata
(C) Well developed aerenchyma
(D) Well developed xylem

Question No:7

Submerged hydrophytes have

(A) Stomata on both surface
(B) Stomata on leaf surface
(C) No stomata
(D) Stomata on lower surface

Question No:8

The stem of submerged water plants is soft and weak because

(A) They are absolutely devoid of xylem
(B) They totally lack phloem
(C) They do not have stomata
(D) The supporting tissue and xylem are poorly developed

Question No:9

Which is not a hydrophytic character?

(A) Abundant air spaces and air chambers
(B) Presence of more xylem and sclerenchyma
(C) Stomata absent or only on upper side of the leaf
(D) Poor development of fruit

Question No:10

The hydrophyte that have contact with water only

(A) Nymphaea
(B) Ceratophyllum
(C) Vallisneria
(D) Typha

Question No:11

Epidermis is useful for both absorption and assimilation in

(A) Mesophytes
(B) Mangroves
(C) Xerophytes
(D) Hydrophytes

Question No:12

Find the pair of hydrophytes that are neither in contact with soil nor air

(A) Vallisneria, Hydrilla
(B) Hydrilla, Utricularia
(C) Salvinia, Azolla
(D) Limnophila, Ceratophyllum

Question No:13

Abundant aerenchyma and xylem cavity in the stele are the features found in

(A) Stem of Hydrilla
(B) Roots of Cicer
(C) Stem of Opuntia
(D) Roots of Asparagus

Question No:14

Select the parr of plants that show contact with soil and water, but not with air

(A) Potamogeton, Vallisneria
(B) Hydrilla, Ceratophyllum
(C) Wolffia,Sagittaria
(D) Cyperus,Typha

Question No:15

Submerged plant among of the following

(A) Hydrilla
(B) Pistia
(C) Lotus
(D) Water lily

Question No:16

Typha is an example of

(A) Free floating plant
(B) Submerged plant
(C) Floating and attached
(D) Emergent plant

Question No:17

In submerged hydrophytes, gaseous exchange occurs through

(A) Hydathodes
(B) Stomata
(C) General body surface
(D) Injured parts

Question No:18

Useful adaptation for hydrophytes

(A) Large leaves
(B) Decrease in mechanical tissue
(C) Large mechanical tissue
(D) Increase in aerenchyma

Question No:19

Hydrophytes like Nymphaea and Nelumbo are

(A) Free floating hydrophytes
(B) Amphibious plant
(C) Submerged rooted hydrophytes
(D) Rooted hydrophytes with free floating leaves

Question No:20

Anatomically all hydrophytes are similar in having

(A) Aerenchyma
(B) Collenchyma
(C) Stomata
(D) Cuticle