Read the following statements and choose the correct option
(i) Aves are homoiothermous.
(ii) Pinnae are present in mammals.
(iii) Operculum is present in Chondrichthyes.
(iv) Skin of amphibians are dry and horny.
(v) Open type of circulation is found in cyclostomes.
(i) and (ii) only are wrong
(ii), (iii) and (iv) only are wrong
(i), (ii) and (iv) only are wrong
(iii), (iv) and (v) only are wrong
(iii), (iv) and (v) only are wrong
D.
(iii), (iv) and (v) only are wrong
Aves are homoiothermous as it can maintain its body temperature. In mammals the ear is usually described as having three parts- the oputer ear, middle ear and inner ear. The outer ear consists of pinna and the ear canal.
Match the following organisms with their respective characteristics :
| A. Pila | i. Flame cells |
| B. Bombyx | ii. Comb plates |
| C. Pleurobrachia | iii. Radula |
| D. Taenia | iv. Malpighian tubules |
Select the correct option from the following:
A - iii; B - iv; C - ii; D - i
A - ii; B - iv; C - iii; D - i
A - iii; B - ii; C - iv; D - i
A - iii; B - ii; C - i; D - iv
A.
A - iii; B - iv; C - ii; D - i
Among the given options, option a is the corrcet answer.
a. Pila is a mollusc. It consists a file like rasping organ for feeding called radula.
b. Bombyx is an arthropod. Its excretion takes place through malpighian tubules.
c. Pleurobrachia is Ctenophore. The body bears eight external rows of ciliated comb plates, which help in locomotion.
d. Taenia is a platyhelminth specialised cells called flame cells help in osmoregulation and excretion.
From evolutionary point of view, retention of the female gametophyte with developing young embryo on the parent sporophyte for some time, is first observed in
Mosses
Pteridophytes
Gymnosperms
Liverworts
B.
Pteridophytes
In Pteridophyte, megaspore is retained for some times in female gametophyte, however the permanent retention is required for seed formation in Gymnosperms.
That's why Pteridophytes exhibit precursor to seed habit only.
Consider following features
(a) Organ system level of organisation
(b) Bilateral symmetry
(c) True coelomates with segmentation of body
Select the correct option of animal groups which possess all the above characteristics
Annelida, Arthropoda and Mollusca
Arthropoda, Mollusca and Chordata
Annelida, Mollusca and Chordata
Annelida, Arthropoda and Chordata
D.
Annelida, Arthropoda and Chordata
True segmentation is present in Annelida, Arthropoda and Chordata. They also have organ system level of organisation, bilateral symmetry and are true coelomates.
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