31.

A male snail homozygous for dextral alleles is crossed with a female homozygous for sinistral alleles. All the F1 individuals showed sinistral phenotype. When F1 progeny snails were self fertilized all individuals of F2 progeny had dextral coiling. This experiment demonstrated

• dominant epistasis as dextral allele is dominant over sinistral allele

• recessive epistasis as in F2 dextral allele appeared in homozygous condition

• maternal effect as the nuclear genotype of the F1 mother has governed the phenotype of the F2 individuals

• maternal inheritance as the mitochondrial genes of the F1 mother has governed the phenotype of the F2 individuals. 

   

Bipinnaria and brachiolaria are the larval forms of 

• Crustacea

• Arthropoda and Mollusca, respectively

• Ophiuroidea and Holothuroidea respectively

• Asteroidea

The animals belonging to phylum Onychophora

• have arthropodan characteristics and thus also considered as a class of Arthropoda

• have both annelidan and arthropodan characteristics

• have both arthropodan and molluscan characteristics 

• serve as a connecting link between Annelida and Mollusca 

Which one of the following parameters is not used in phenetic classification of bacteria? 

•  trophism

• susceptibility of a bacteria to a particular bacteriophage

• reaction to a particular antibody

• 16S rRNA sequence 

Which of the following groups represents SAR clade of protists? 

• Euglenozoans, Red algae, Parabasilids

• Brown algae, Forams, Radiolarians 

• Slime moulds, Entamoebas, Diplomonads 

• Charophyes, Choanoflagellates, Tubulinids 

Given below are biodiversity hotspots in decreasing order of endemic plant species recorded in them. Select the correct order. 

• Western Ghats and Sri Lanka > Indo-Burma > Sundaland > Philippines

• Philippines > Sundaland > Indo-Burma > Western Ghats and Sri Lanka 

• Sundaland > Indo-Burma > Philippines > Western Ghats and Sri Lanka

• Western Ghats and Sri Lanka > Sundaland > Philippines > Indo-Burma 

Which of the following options lists ecosystems in increasing order of plant productivity per day per unit leaf area? 

• Tropical forests, hot deserts, temperate forests

• Hot deserts, temperate forests, tropical forests 

• Hot deserts, temperate grasslands, tropical forests

• Tropical forests, temperate grasslands, hot deserts 

A general increase in the average body mass of animal population within a species with latitude is known as

• Allen’s rule

• Bergmann’s rule 

• Allec effect

• Hamilton’s rule 

Ruderal species are those which are found in the environments with

• low disturbance, high competition

• high disturbance, low competition 

• low disturbance, low competition

• high disturbance, high competition 

Scientists discovered two new plant species, “A” and “B” that look similar except that, species “A” bears flowers and leaves that are twice the size of those in species “B”. Which method should the scientists use to appropriately investigate if species “A” is a result of gene duplication in species “B”? 

• Sequence similarity, gene structure and gene size

• Plant size, physical proximity of gene and genome size.

• Sequence similarity, physical proximity of gene, genome size

• Sequence length, gene structure and chromosome count.