NEET Biology CBT MCQs,NCERT CBSE Biology Online Practice Test,pdf

Plant Ecology Mock Test-5

NEET Biology Plant Ecology Mock-Test-5



To produce 1gm dry organic matter the amount of CO2 fixed is

(A) 1.98 gm
(B) 20 gm
(C) 1.63 gm
(D) 40 gm



Natural ecosystem may have helped to stabilize climate and prevent overheating of the Earth by removing more of

(A) The green house gases from atmosphere
(B) CO2 from the atmosphere
(C) Ground water
(D) (a) and (b)



The purpose of developing a carbon tax system in many countries is to

(A) reduce green house gases
(B) cut down CO2 in atmosphere
(C) cut down CO in atmosphere
(D) All the above



An effective measure to prevent global warming is

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



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



“The lungs of the world” – are

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



(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



(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



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



(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



(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



(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



(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



(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



(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



(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



Both, hydrarch and xerarch successions lead to

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



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



Lichen is the pioneer vegetation on which succession?

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