161. Artificial selection to obtain cows yielding higher milk output represents
(1) Stabilizing selection as it stabilizes this character in the population
(2) Directional as it pushes the mean of the character in one direction
(3) Disruptive as it splits the population into two one yielding higher output and the other lower output
(4) Stabilizing followed by disruptive as it stabilizes the population to produce higher yielding cows
Answer (2)
Sol. Artificial selection to obtain cow yielding higher milk output will shift the peak to one direction, hence, will be an example of Directional selection. In stabilizing selection, the organisms with the mean value of the trait are selected. In disruptive selection, both extremes get selected.
- Select the correct route for the passage of sperms in male frogs :
(1) Testes —> Bidder’s canal —> Kidney —> Vasa efferentia —> Urinogenital duct —> Cloaca
(2) Testes —> Vasa efferentia —> Kidney —> Seminal Vesicle —> Urinogenital duct —> Cloaca
(3) Testes —> Vasa efferentia —> Bidder’s canal —> Ureter —> Cloaca
(4) Testes —> Vasa efferentia —> Kidney —> Bidder’s canal —> Urinogenital duct —> Cloaca
Answer (4)
Sol. In male frog the sperms will move from
Testes —> Vasa efferentia —> Kidney —> Bidder’s canal —> Urinogenital duct —> Cloaca.
163. Which of the following options best represents the enzyme composition of pancreatic juice?
(1) Amylase, peptidase, trypsinogen, rennin
(2) Amylase, pepsin, trypsinogen, maltase
(3) Peptidase, amylase, pepsin, rennin
(4) Lipase, amylase, trypsinogen, procarboxy-peptidase
Answer (4)
Sol. Rennin and Pepsin enzymes are present in the gastric juice. Maltase is present in the intestinal juice.
164. Phosphoenol pyruvate (PEP) is the primary CO acceptor in :
(1) C 3 plants
(2) C 4 plants
(3) C 2 plants
(4) C 3 and C 4 plants
Answer (2)
Sol. PEP is 3C compound which serves as primary CO acceptor in the mesophyll cell cytoplasm of C plants like maize, sugarcane, Sorghum etc.
165. The morphological nature of the edible part of coconut is
(1) Perisperm
(2) Cotyledon
(3) Endosperm
(4) Pericarp
Answer (3)
Sol. Coconut has double endosperm with liquid endosperm and cellular endosperm.
166. Anaphase promoting complex (APC) is a protein degradation machinery necessary for proper mitosis of animal cells. If APC is defective in a human cell, which of the following is expected to occur?
(1) Chromosomes will not condense
(2) Chromosomes will be fragmented
(3) Chromosomes will not segregate
(4) Recombination of chromosome arms will occur
Answer (3)
Sol. Anaphase Promoting Complex (APC) is a protein necessary for separation of daughter chromosomes during anaphase. If APC is defective then the chromosomes will fail to segregate during anaphase.
167. MALT constitutes about_____________ percent of the lymphoid tissue in human body.
(1) 50%
(2) 20%
(3) 70%
(4) 10%
Answer (1)
Sol. MALT is Mucosa Associated Lymphoid Tissue and it constitutes about 50 percent of the lymphoid tissue in human body.
168. Receptor sites for neurotransmitters are present on
(1) Membranes of synaptic vesicles
(2) Pre-synaptic membrance
(3) Tips of axons
(4) Post-synaptic membrane
Answer (4)
Sol. Pre-synaptic membrane is involved in the release of neurotransmitter in the chemical synapse. The receptors sites for neurotransmitters are present on post-synaptic membrane.
169. Hypersecretion of Growth Hormone in adults does not cause further increase in height, because
(1) Growth Hormone becomes inactive in adults
(2) Epiphyseal plates close after adolescence
(3) Bones loose their sensitivity to Growth Hormone in adults
(4) Muscle fibres do not grow in size after birth
Answer (2)
Sol. Epiphyseal plate is responsible for the growth of bone which close after adolescence so hypersecretion of growth hormone in adults does not cause further increase in height.
170. Alexander Von Humbolt described for the first time
(1) Ecological Biodiversity
(2) Laws of limiting factor
(3) Species area relationships
(4) Population Growth equation
Sol. Alexander Von Humboldt observed that within a region species richness increases with the increases in area.
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