Question No:1

An effective measure to prevent global warming is

(A) Drip – irrigation
(B) afforestation
(C) to provide growth chambers
(D) None

Question No:2

The amount of oxygen produced by a tree depends on

(A) the species of tree
(B) the age of tree
(C) its health
(D) All the above

Question No:3

“The lungs of the world” – are

(A) Plants
(B) Planktons
(C) Human beings
(D) a and b

Question No:4

(A): Hydrophytes do not possess root hairs
(R): Chief anatomical adaptation of hydrophytes is the presense of aerenchyma

(A) If both A and R are true, and R is the correct explanation of A.
(B) If both A and R are true, and R is not the correct explanation of A.
(C) If A is true R is false
(D) If both A and R are false

Question No:5

(A): Epidermis of hydrophytes is useful for absorption and assimilation
(R): In hydrophytes the epidermal cells are devoid of cuticle and possess chloroplasts

(A) If both A and R are true, and R is the correct explanation of A.
(B) If both A and R are true, and R is not the correct explanation of A.
(C) If A is true R is false
(D) If both A and R are false

Question No:6

A):The stem of hydrophytes is soft, delicate and more or less spongy
R):Most of the hydrophytes show poorly developed sclerenchyma and xylem

(A) If both A and R are true, and R is the correct explanation of A.
(B) If both A and R are true, and R is not the correct explanation of A.
(C) If A is true R is false
(D) If both A and R are false

Question No:7

(A):In submerged hydrophytes exchange of gasses takes place through the thin walled epidermis
(R): Stomata are absent in all hydrophytes

(A) If both A and R are true, and R is the correct explanation of A.
(B) If both A and R are true, and R is not the correct explanation of A.
(C) If A is true R is false
(D) If both A and R are false

Question No:8

(A):Salvinia is a free floating hydrophyteplants
(R):A11 free floating plants are invariably flowering plants

(A) If both A and R are true, and R is the correct explanation of A.
(B) If both A and R are true, and R is not the correct explanation of A.
(C) If A is true R is false
(D) If both A and R are false

Question No:9

(A):Xylem is poorly developed in xerophytes
(R): Absorption of water and salts is carried through the general surface in submerged plants.

(A) If both A and R are true, and R is the correct explanation of A.
(B) If both A and R are true, and R is not the correct explanation of A.
(C) If A is true R is false
(D) If both A and R are false

Question No:10

(A):Tribulus survives in the form of seeds during un favorable conditions
(R): Tribulus completes its life cycle within 6 – 8 weeks during un favorable conditions

(A) If both A and R are true, and R is the correct explanation of A.
(B) If both A and R are true, and R is not the correct explanation of A.
(C) If A is true R is false
(D) If both A and R are false

Question No:11

(A): The phenomenon of succession is community controlled.
(R):Each group of organisms changes its physical substrate and microclimate to make the conditions favorable for other group of organisms.

(A) If both A and R are true, and R is the correct explanation of A.
(B) If both A and R are true, and R is not the correct explanation of A.
(C) If A is true R is false
(D) If both A and R are false

Question No:12

(A): Autotrophic succession is characterised by early and continued dominance of green plants.
(R):It begins in a predominantly organic environment and there is a progressive decline in energy content.

(A) If both A and R are true, and R is the correct explanation of A.
(B) If both A and R are true, and R is not the correct explanation of A.
(C) If A is true R is false
(D) If both A and R are false

Question No:13

(A): Crustose lichens are the pioneer community of a litho sere.
(R): During the climax stage of litho sere, the increasing humus content of soil favour the mesophytic vegetation.

(A) If both A and R are true, and R is the correct explanation of A.
(B) If both A and R are true, and R is not the correct explanation of A.
(C) If A is true R is false
(D) If both A and R are false

Question No:14

Both, hydrarch and xerarch successions lead to

(A) medium water conditions
(B) xeric conditions
(C) highly dry conditions
(D) excessive wet conditions

Question No:15

Most of the plants cultivated in agriculture are actually belonging to the succession level

(A) early 1⁰ succession
(B) late 1⁰ succession
(C) early 2⁰ succession
(D) late 2⁰ succession

Question No:16

Lichen is the pioneer vegetation on which succession?

(A) Hydrosere
(B) Lithosere
(C) Psammosere
(D) Xerosere