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Assertion (A): Mixed blood circulates in the body of a fish.
Reason (R): Fishes are characterised by the presence of two chambered heart.

A
Both A and R are true and R is the correct explanation for A.

B
Both A and R are true but R is not the correct explanation for A.

C
A is true and R is false.

D
A is false and R is true.

Text SolutionText solutionverified iconVerified

Mixed blood circulates in the body of fish because blood circulation in fish is incomplete.
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Question 3
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The body is covered with solt teathers (leathery exos. (c) CLASS REPTLIA : - There are two pairs of limbs. The fore limbs are modit St - These are first truly terrestrial animals living in warmer regions. reduced (as in non-llying birds). Hind limbs are stron - Endoskeleton is light, the bones have got air cavitie - Jaws are modified to form a strong beak. Characters: - Body is divisble into head, neck and trunk. Tail is well developed in some, while . - Teeth are absent. - Respiration is by lungs only. Lungs have additione (i) - Two pairs of pentadactyl limbs are present ; but in snakes limbs are reduced or ableal horny scales. - Body is covered with epidermal hoin is dry, impermeable and devoid of glands. - Respiration takes place by lungs only, gills are absent. - Heart is incompletely four- chambered, having two auricles and incompletely divided ien - Heart is completely four chambered. - Sexes are separate. - Birds are oviparous, Le. egg laying. - Fertilization is intemal. Fertilized eggs are lai In crocodile, heart is completely four chambered. - Sexes are separate. - Like reptiles and mammals, they have the em - Holksac and allantois. - Fertilization is internal(characteristics of land animals). - There is no larval stage in development. (crow), Passer (sparrow), Struthio (ostrich) (ii) - The embryo always lies in a fluid filled sac called amnion. They is no larval soy Hevelopment, e.g. Testudo(tortoise), Chelone
Question 4
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plet sum 3.3 st erent els. walls, Frach nine d. X on. of t no uestions 1. Name types of simple tissues. 2. Where is apical meristein found? 3. Which tissue makes up the husk of coconur? TISSUES 4. What are the constituents of phloem? 6.3 Animal Tissues When we breathe we can actually feel the movement of our chest. How do these body parts move? For this we have specialised cells called muscle cells (Fig. 6.8), The contraction and relaxation of these cells result in movement Stomach Smooth muscle fibres Nucleus Smooth muscle fibre (Cell) Fig. 6.8: Location of muscle fibres During breathing we inhale oxygen. Where does this oxygen go? It is absorbed in the lungs and then is transported to all the body cells through blood. Why would cells need oxygen? The functions of mitochondria we studied earlier provide a clue to this question. Blood flows and carries various substances from one part of the body to the other. For example. It carries oxygen and food to all cells. It also collects wastes from all parts of the body and carries them to the liver and kidney for disposal. Blood and muscles are both examples of tissues found in our body. On the basis of the functions they perform we can think of different types of animal tissues, such as epithelial tissue, connective tissue, muscular tissue and nervous tissue. Blood is a type of connective tissue, and muscle forms muscular ussue. 6.3.1 EPITHELIAL TISSUE The covering or protective tissues in the animal body are epithelial tissues. Epithelium covers most organs and cavities within the body. It also forms a barrier to keep different body systems separate. The skin, the lining of the mouth, the lining of blood vessels. lung alveoli and Ridney tubules are all made of epithelial tissue. Epithelial tissue cells are tightly packed and form a continuous sheet. They have only a small amount of cementing material between them and almost no intercellular spaces. Obviously, anything entering or leaving the body must cross at least one layer of epithelium. As a result, the permeability of the cells of various epithelia play an important role in regulating the exchange of materials between the body and the external environment and also between different parts of the body. Regardless of the type, all epithelium is usually separated from the underlying tissue by an extracellular fibrous basement membrane... Different epithelia (Fig. 6.9) show differing structures that correlate with their unique functions. For example, in cells lining blood vessels or lung alveoli, where transportation of substances occurs through a selectively permeable surface, there is a simple flat kind 73
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Question Text
Assertion (A): Mixed blood circulates in the body of a fish.
Reason (R): Fishes are characterised by the presence of two chambered heart.
TopicDiversity in Living Organisms
SubjectScience
ClassClass 9
Answer TypeText solution:1
Upvotes64