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Match List-I with List-II: List-I (a) Chlamydomonas (b) Cycas (c) Selaginella (d) Sphagnum List-II (i) Moss (ii) Pteridophyte (iii) Algae (iv) Gymnosperm Choose the correct answer from the options given below:
Match the following groups of organisms with their respective distinctive characteristics and select the correct option: **Organisms**: (a) Platyhelminthes, (b) Echinodermata, (c) Hemichordata, (d) Cnidaria **Characteristics**: (i) Stomochord, (ii) Cnidoblasts, (iii) Flat body, (iv) Water vascular system
Select the incorrect statements with respect to Cyclostomes:
Select the correct statements with reference to chordates. A: Presence of a mid-dorsal, solid and double nerve cord. B: Presence of closed circulatory system. C: Presence of paired pharyngeal gill slits D: Presence of dorsal heart. E: Triploblastic pseudocoelomate animals.
Which of the following animals has three chambered heart?
The figure shows four animals (a), (b), (c) and (d). Select the correct answer with respect to a common characteristic of two of these animals:
Which one of the following features are not true for chordates?
Match List-I with List-II: List-I A. Pleurobrachia B. Radula C. Stomochord D. Air bladder List-II I. Mollusca II. Ctenophora III. Osteichthyes IV. Hemichordata
Given below are two statements: I: Amphibians and reptiles have a 3-chambered heart with two atria and a single ventricle, and are oviparous in nature II: Crocodiles possess a 4 chambered heart with two ventricles and two atria and are viviparous in nature Select the most appropriate option:
The incorrect statement regarding enzymes is
The process of formation of mature female gamete is called
Air bladder is found in:
In which of the following animals, the digestive tract has additional chambers like crop and gizzard?
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R) Assertion (A): All vertebrates are chordates but all chordates are not vertebrates. Reason (R): Notochord is replaced by vertebral column in the adult vertebrates. In the light of the above statements, choose the most appropriate answer from the options given below:
Select the correct statements: A: Platyhelminthes are triploblastic, pseudocoelomate and bilaterally symmetrical organisms. B: Ctenophores reproduce only sexually and fertilization is external. C: In tapeworm, fertilization is internal but sexes are not separate. D: Ctenophores are exclusively marine, diploblastic and bioluminescent organisms. E: In sponges, fertilization is external and development is direct. Choose the correct answer from the options given below:
Match List-I with List-II List-I (A) Contractile vacuole (B) Water vascular system (C) Canal system (D) Flame cells List-II (I) Asterias (II) Amoeba (III) Spongilla (IV) Taenia Choose the correct answer from the options given below:
The unique mammalian characteristics are:
Read the following statements about the vascular bundles: (a) In roots, xylem and phloem in a vascular bundle are arranged in an alternate manner along the different radii. (b) Conjoint closed vascular bundles do not possess cambium. (c) In open vascular bundles, cambium is present in between xylem and phloem. (d) The vascular bundles of dicotyledonous stem possess endarch protoxylem. (e) In monocotyledonous root, usually there are more than six xylem bundles. Choose the correct answer from the options given below:
Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following :
In old trees the greater part of secondary xylem is dark brown and resistant to insect attack due to :