Five Kingdom system of classification suggested by RH Whittaker is not based on
presence or absence of a well-defined nucleus
mode of reproduction
Mode of nutrition
Mode of nutrition
A.
presence or absence of a well-defined nucleus
RH Whittaker's classification is nor based on presence or absence of a well - defined nucleus. He gave five kingdom classification and used five criteria for delimiting kingdoms.
These are
both come under body organisation
(i) Complexity of cell structure
(ii) Complexity of body structure
(iii) Mode of nutrition
(iv) Ecological life cycle including mode of reproduction
(v)Phylogenetic relationship.
He divided organisms into five kingdoms as follows:
Kingdom - Monera
Kingdom - Protista
Kingdom - Fungi
Kingdom - Plantae
Kingdom - Animalia
A senentary sea anemone gets attached to the shell lining of hermit crab. The association is
ectoparasitism
symbiosis
commensalism
commensalism
C.
commensalism
This type of mutualisn to called protocooperation. In this type, the sea anemone grows on the back of the hermit crab. It protects the crab with the help of its nematocysts. Ectoparasites live on the outside of host., e.g., Human body louse. In this interaction, the parasite gets the benefits at the expense of the host.
Commensalism is an association between organisms in which one or both the species are benefitted and neither species is harmed. In amensalism, one species is harmed whereas the other is unaffected. Predation parasitism and commensalism share a common characteristic, the interacting species live closely together.
A jawless fish, which lays eggs in fresh water and whose ammocoetes larvae after metamorphosis return to the ocean is:
Eptatretus
Myxine
Neomyxine
Neomyxine
D.
Neomyxine
Petromyzon(the lamprey) belongs to the section Agnatha of the sub-phylum-Vertebrata. They have long, greenish brown, cylindrical body with smooth scaleless, slimy skin, jawless mouth, etc. They lay eggs in freshwater but their ammocoete larvae(lower) after metamorphosis return to the ocean.
Metagenesis refers to
Presence of different morphic forms
Alternation of generation between asexual and sexual phases of an organism
Occurrence of a drastic change in form during post-embyonic development
Occurrence of a drastic change in form during post-embyonic development
B.
Alternation of generation between asexual and sexual phases of an organism
Metagenesis is an organisation refers to the reproduction characterised by the alteration of a sexual generation and a generation that reproduces asexually, i.e., alternation of generations.
The chitinous exoskeleton of arthropods is formed by the polymerisation of
Keratin sulphate and chondraitin sulphate
D-glucosamine
N-acetyl glucosamine
N-acetyl glucosamine
C.
N-acetyl glucosamine
The chitinous exoskeleton of arthropods is formed by the polymerisation of N-acetyl glucosamine, which is a derivative of glucose. It is also a characteristic component of the cell wall of fungi, the radulae of molluscs and the beaks and internal shells of cephalopods including squid and octopuses.