Recent questions in Biology

Regarding Classes Chondrichthyes & Osteichthyes of Pisces: Assertion (A): They are called cold-blooded animals. Reason (R): They are aquatic (marine or fresh water) and as they in continous contact with water their blood is cold. Regarding (A) and (R) :

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Class - Chondrichthyes : 1. Some of them have electric organs (e.g., Trygon) 2. Some possess poison sting (e.g., Torpedo). Regarding 1 and 2:

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In Chondrichthyes, Heart is

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Regarding Class - Chondrichthyes : Assertion (A): In Chondrichthyes, air bladder is absent. Reason (R): They have to swim constantly to avoid sinking. Regarding (A) and (R) :

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Class – Chondrichthyes : 1. The skin is tough, containing minute placoid scales. 2. Teeth are modified placoid scales Regarding 1 and 2:

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In Chondrichthyes, Gill slits are

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Class – Chondrichthyes : 1. Mouth is located dorsally. 2. Notochord is present only in embryonic life. Regarding 1 and 2:

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Cyclostomata includes:

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Class – Cyclostomata : 1. Their larvae udergo metamorphosis in fresh water 2. After metamorphosis, they return to the ocean Regarding 1 and 2:

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Class - Cyclostomata : 1. They bear 6-12 pairs of gill slits for respiration. 2. Cyclostomes have a circular mouth without jaws for sucking. Regarding 1 and 2:

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1. All living members of the class Cyclostomata are ectoparasites 2. Fishes are their hosts. Regarding 1 and 2:

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Division Gnathostomata includes all except:

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Super Class Tetrapoda includes all except:

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vertebrates have a ventral muscular heart with :

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1. All vertebrates are not chordates 2. But all chordates are vertebrates. Regarding 1 and 2:

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1. The members of subphylum Vertebrata possess notochord during the embryonic period. 2. The notochord is replaced by a cartilaginous or bony vertebral column in the adult. Regarding 1 and 2:

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Ascidia, Branchiostoma, Doliolum, Salpa

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Choose the odd one out:

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Protochordates are : 1. Subphyla Tunicata and Cephalochordata 2. They may be marine or terrestrial. Regarding 1 and 2:

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Protochordates are :

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Phylum Chordata is divided into subphyla:

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1. Chordates : A post- part (tail) is present. 2. Non-chordates : Post- tail is absent. Regarding 1 and 2:

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Regarding position of heart :- 1. In Chordates : dorsal 2. In Non-chordates : ventral (if present).

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1. Chordates : Gill slits are absent. 2. Non-chordates : Pharynx perforated by gill slits. Regarding 1 and 2:

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Regarding Central nervous system :- 1. In Chordates : dorsal, hollow and single. 2. In Non-chordates : ventral, solid and double.

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Members of Phylum – Chordata : (i) possess a post **** tail (ii) possess a closed circulatory system Regarding (i) and (ii):

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Members of Phylum – Chordata are

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Animals belonging to phylum Chordata are fundamentally characterised by the presence of

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Regarding Phylum - Hemichordata : choose the appropriate option

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Regarding Phylum - Hemichordata : it consists of marine animals

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Regarding Phylum – Echinodermata : 1. Fertilisation is usually external. 2. Development is indirect with free-swimming larva. Regarding 1 and 2 :

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Regarding Phylum – Echinodermata : 1. Reproduction is sexual. 2. Fertilisation is always internal. Regarding 1 and 2 :

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Regarding Phylum – Echinodermata : 1. The most distinctive feature of echinoderms is the presence of water vascular system. 2. An excretory system is absent Regarding 1 and 2 :

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The water vascular system of echinoderms helps in:

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Regarding Phylum - Echinodermata :

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Regarding Phylum – Echinodermata : 1. The adult echinoderms are bilaterally symmetrical 2. The larvae are radially symmetrical Regarding 1 and 2 :

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Regarding Phylum – Echinodermata : 1. These animals have an endoskeleton of calcareous ossicles 2. All are marine Regarding 1 and 2 :

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Regarding Phylum - Echinodermata : Assertion (A): In member- of Echinodermata body is covered by calcareous ossicles Reason (R): As body is covered by calcareous ossicles they are called Echinodermata Regarding (A) and (R) :

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In Mollusca gills have respiratory and excretory functions.

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In Mollusca, body is/ has

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Molluscs have :

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By habitat Molluscs are :

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Butterfly belongs to

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Scorpion and Prawn belong to

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Choose the odd one out:

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Choose the odd one out:

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Choose the odd one out:

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Choose the odd one out:

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In Arthropoda : 1. They are mostly monoecious. 2. Fertilisation is usually internal. Regarding 1 and 2:

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In Arthropoda, Sensory organs present includes:

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