Questions paper Gate Life Science

Q.1 The swollen base of a petiole is known as
(A)  Ligule                       
(B)  Hastule
(C)  Pulvinus                
(D)  Stipule 
Ans. (C)
Q.2 An estimate of phylogenetic relationships among the taxa is commonly represented in the form of a 
(A)  Cladogram             
(B) Idiogram
(C)  Phenogram            
(D) Dendrogram 
Ans. (A)
Q.3 Parenchyma cells associated with sieve tube members are called
(A)  Albuminous cells
(B)  Companion cells
(C)  Bulliform cells
(D)  Subsidiary cells 
Ans. (B)
Q.4 Cytoplasmic male sterility via the chloroplast genome can be induced by the expression of Pha A gene encoding
(A)   𝛽-Ketothiolase
(B)  Acetoacetyl CoA carboxylase
(C)  Acetoacetyl CoA reductase
(D)  PHB synthase 
Ans. (A)
Q.5 The number of nucleosomes present in a 30 nm solenoid structure of a chromatin is
(A)  2                           
(B) 4 
(C)  6                           
(D) 8  
Ans. (C)
Q.6 Which one of the following performs normal C3 photosynthesis when water is available, but  switches to crassulacean acid metabolism (CAM) during salt or drought stress?
(A)  Mesembryanthemum crystallinum
(B)  Cynodon dactylon
(C)  Eleucine coracana
(D)  Hordeum vulgare 
Ans. (A)
Q.7 Which one of the following is a free-living photosynthetic nitrogen fixer?
(A)  Frankia                  
(B) Clostridium
(C)  Rhodospirillum       
(D) Rhizobium 
Ans. (C)
Q.8 Carbon dioxide and other ‘greenhouse gases’ act by
(A)  destroying ozone in the stratosphere
(B)  trapping heat in the earth’s atmosphere 
(C) allowing more visible light to reach the earth’s surface
(D) reducing the amount of radiant energy which reaches the surface of the earth 
Ans. (B)
Q.9 Which of the following best represents the flow of energy through an ecosystem?
(A) Producers → Primary consumers  → Secondary consumers
(B)  Sun  → Producers  → Secondary consumers  → Primary consumers
(C)  Sun  → Producers  → Primary consumers  → Secondary consumers
(D)Secondary consumers →  Primary consumers  →  Producers  → Sun 
Ans. (C)
Q.10 Which one of the following drugs is obtained from the capsule of Papaver somniferum?
(A)  Papain                   
(B) Codeine
(C)  Digoxin                 
(D) Bromelain 
Ans. (B)
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