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[A] : The coelomic cavity of Leech is mo...

[A] : The coelomic cavity of Leech is mostly filled with botryoidal tissue formed of branching tubular cells .
[R] : Hence the coelomic cavity is reduced to four longitudinal channels and their branches .

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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Refer to the given dichotomous key and answer the following questions. I. (a) The cells of tissue have walls. - Go to II (b) The cells of tissue do not possess wall. - Go to III II. (a) Tissue made of one type of cells. - Go to IV (b) Tissue, made of more than one type of cells. - Go to V III. (a) The tissue lines the alveoli of lungs. -P (b) The tissue forms shock absorbing cushion around some vital organs. - Q IV. (a) Cells of tissue contain air cavities and it provides buoyancy. -R (b) The tissue provides mechanical strength and flexibility to young dicot stems and petioles. - S V. (a) Tissue conducts water. - T (b) Tissue conducts organic solutes. - U Select the incorrect option regarding tissues P, Q, R, S, T and U.

Read the passage and answer the questions: Implantation is the embedding of the blastocyst into the endometrium of the uterus. Blastocyst is a ball of cells with a large, fluid-filled cavity called the blastocoel. The blastomeres in the blastocyst are arranged into an outer layer called trophoblast and inner cell mass. With the formation of blastocoel, morula is converted to blastula which is called blastocyst in mammals. Assertion (A): Blastocyst undergoes gastrulation to form three germinal layers. Reason (R): This involves cell movements (morphogenetic movement) that help to attain new shape and morphology of embryo.

Fill in the blanks : (i) In the group Protosomia, "….............." is deerived fromt eh blastopore of the embryo and "…..........." is formed at the opposite end. (ii) In the group Deuterostomia, "…............" develops from the blastopore of the embryo and the "..................." arises at the opposite end. (iii) Similarity in the arrangement of parts on the opposite sides of the body is termedas "................" . (iv) Animals like Hydra and Jellyfish depict "..................." symmetry whereas allvertebrates show "................." symmetry. (v) The structures projecting from the body of an animal for use in locomotion, feeding and some other purposes are called "..............." (vi) There is no digestive tract in Mesozoa and "................" . On the other hand , most "................" have a digestive tract. (vii) In ".............." and "..................." digestive tract has only single opening (mouth ) and is sait to be incomplete. (viii) Sponges develop from two germ layers and hence are termed "............." animals. They have "............" of organization. (ix) The digestive tract in coelenterates is "..................." and gastrovascular cavity acts as a "............." against which the contractile cells can work. (x) Jellyfishes and sea anemones belong to phylum "............." (xi) PhylumPlatyhelminthesis divided into three classes , Turbellaria, "............." and "............." . (xii) Trichinella (Trichina worm) is a cosmopolitan "............." paraste whereas Fasciola (liver fluke) lives in the bile ducts of the liver of "............" and ".............." . (xiii) Arthropods are commonly known as animals ".........." (xiv) Centripede belongs to class "................" while millipede belongs to class ".............."

TRUEMAN BIOLOGY-Animal Kingdom -ASSERTION AND REASON
  1. [A] : In reptiles , lizards show autotomy . [R] : Tail of most lizar...

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  2. [A] : Heloderma is called beaded lizard . [R] : Its scales resemble ...

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  3. Assertion: Kraits ar poisonous snakes. Reason: Belly scales are smal...

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  4. [A] : In the adult bird , only the left ovary is well developed . [R...

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  5. [A] : Rabbit is classified as mammal . [R] : Rabbit possesses mammar...

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  6. [A] : Origin of mammals is polyphyletic . [R] : Mammals are derived...

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  7. [A] : The Ascidian tadpole larva possess all the basic chordate charac...

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  8. [A] : Tail wagging dance is performed for short distances . It conveys...

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  9. [A] : A pair of coxal glands are found in each side of metasoma of sco...

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  10. [A] : Honey bees are social insects known for producing honey and bees...

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  11. Assertion : Cold blooded animals do not have fat layer. Reason : Col...

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  12. [A] : Neoteny is the retention of larval form throughout the life . ...

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  13. [A] : In Parthenogenesis , fertilized egg is stimulated to divide . ...

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  14. [A] : Protozoans have no physiological division of labour . [R] : Th...

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  15. [A] : Many desert mammals cool the exhaled air in their noses , befor...

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  16. [A] : Amoeba is regarded as the lowest form of animals. [R] : Body o...

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  17. Assertion : Bats and whales are classified as mammals Reason : Bats ...

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  18. [A] : The coelomic cavity of Leech is mostly filled with botryoidal ti...

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  19. [A] : When a foreign object , such as a sand grain gets in between the...

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  20. Assertion: The duck-billed platypus and the spiny anteater, both are e...

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