Fish have a two-chambered heart (one atrium and one ventricle). Blood flows once through the heart in a single circulation, and oxygenated and deoxygenated blood mix. Humans, however, have a four-chambered heart (two atria and two ventricles), completely separating oxygenated and deoxygenated blood.Read more
Fish have a two-chambered heart (one atrium and one ventricle). Blood flows once through the heart in a single circulation, and oxygenated and deoxygenated blood mix. Humans, however, have a four-chambered heart (two atria and two ventricles), completely separating oxygenated and deoxygenated blood. This double circulation ensures efficient oxygen transport throughout the body. Hence, mixing is prevented in humans but not in fishes due to differences in heart structure.
In plants, water moves through the xylem vessels from roots to leaves by the transpiration pull mechanism. Evaporation of water from leaf surfaces creates a negative pressure that pulls water upward. Cohesion between water molecules, adhesion to xylem walls, and capillary action together maintain aRead more
In plants, water moves through the xylem vessels from roots to leaves by the transpiration pull mechanism. Evaporation of water from leaf surfaces creates a negative pressure that pulls water upward. Cohesion between water molecules, adhesion to xylem walls, and capillary action together maintain a continuous column of water. This upward movement supplies essential water and minerals for photosynthesis and maintains plant turgidity.
Using the given organisms, two separate food chains can be formed: Grass → Rabbit → Fox → Tiger → Vulture Trees → Insects → Frog → Snake → Owl These food chains are interconnected, forming a food web that shows how energy flows through producers, consumers, and decomposers. Producers like grass andRead more
Using the given organisms, two separate food chains can be formed:
Grass → Rabbit → Fox → Tiger → Vulture
Trees → Insects → Frog → Snake → Owl
These food chains are interconnected, forming a food web that shows how energy flows through producers, consumers, and decomposers. Producers like grass and trees convert sunlight into food, supporting herbivores, carnivores, and decomposers in maintaining ecological balance.
A neuron is the structural and functional unit of the nervous system. It consists of dendrites, a cell body, and an axon. Dendrites receive impulses from other neurons and transmit them to the cell body. The impulse then passes along the axon to axon terminals, where it is transferred to another neuRead more
A neuron is the structural and functional unit of the nervous system. It consists of dendrites, a cell body, and an axon. Dendrites receive impulses from other neurons and transmit them to the cell body. The impulse then passes along the axon to axon terminals, where it is transferred to another neuron or effector through synapses using neurotransmitters. This mechanism ensures the rapid and efficient transmission of information throughout the body.
In the cross RRyy × rrYY, the F₁ plants are RrYy (round yellow). Gametes formed are RY, Ry, rY, ry. On self-pollination, the F₂ generation shows independent assortment of traits, producing a phenotypic ratio of 9 round yellow : 3 round green : 3 wrinkled yellow : 1 wrinkled green. If 144 seeds are pRead more
In the cross RRyy × rrYY, the F₁ plants are RrYy (round yellow). Gametes formed are RY, Ry, rY, ry. On self-pollination, the F₂ generation shows independent assortment of traits, producing a phenotypic ratio of 9 round yellow : 3 round green : 3 wrinkled yellow : 1 wrinkled green. If 144 seeds are produced, the numbers are 81, 27, 27, and 9 respectively. This experiment demonstrates Mendel’s Law of Independent Assortment.
How many chambers are there in the heart of the following organisms? How is mixing of oxygenated and deoxygenated blood prevented in their body? (i) Fishes (ii) Humans
Fish have a two-chambered heart (one atrium and one ventricle). Blood flows once through the heart in a single circulation, and oxygenated and deoxygenated blood mix. Humans, however, have a four-chambered heart (two atria and two ventricles), completely separating oxygenated and deoxygenated blood.Read more
Fish have a two-chambered heart (one atrium and one ventricle). Blood flows once through the heart in a single circulation, and oxygenated and deoxygenated blood mix.
See lessHumans, however, have a four-chambered heart (two atria and two ventricles), completely separating oxygenated and deoxygenated blood. This double circulation ensures efficient oxygen transport throughout the body. Hence, mixing is prevented in humans but not in fishes due to differences in heart structure.
Explain the mechanism by which the water is transported in plants?
In plants, water moves through the xylem vessels from roots to leaves by the transpiration pull mechanism. Evaporation of water from leaf surfaces creates a negative pressure that pulls water upward. Cohesion between water molecules, adhesion to xylem walls, and capillary action together maintain aRead more
In plants, water moves through the xylem vessels from roots to leaves by the transpiration pull mechanism. Evaporation of water from leaf surfaces creates a negative pressure that pulls water upward. Cohesion between water molecules, adhesion to xylem walls, and capillary action together maintain a continuous column of water. This upward movement supplies essential water and minerals for photosynthesis and maintains plant turgidity.
See lessAbout 100 acres of forest land was declared as Natural reserve park. The following organisms were predominant in the Natural reserve park: rabbit, frog, grass, fish, fox, water insects, zebra, peacock, snake, trees, bird, owl, insects, tiger, vulture, duck. Create a food web comprising two separate food chains with different producers by using the above data.
Using the given organisms, two separate food chains can be formed: Grass → Rabbit → Fox → Tiger → Vulture Trees → Insects → Frog → Snake → Owl These food chains are interconnected, forming a food web that shows how energy flows through producers, consumers, and decomposers. Producers like grass andRead more
Using the given organisms, two separate food chains can be formed:
These food chains are interconnected, forming a food web that shows how energy flows through producers, consumers, and decomposers. Producers like grass and trees convert sunlight into food, supporting herbivores, carnivores, and decomposers in maintaining ecological balance.
See lessDraw and explain how the nerve cells help in transmission of impulses?
A neuron is the structural and functional unit of the nervous system. It consists of dendrites, a cell body, and an axon. Dendrites receive impulses from other neurons and transmit them to the cell body. The impulse then passes along the axon to axon terminals, where it is transferred to another neuRead more
A neuron is the structural and functional unit of the nervous system. It consists of dendrites, a cell body, and an axon. Dendrites receive impulses from other neurons and transmit them to the cell body. The impulse then passes along the axon to axon terminals, where it is transferred to another neuron or effector through synapses using neurotransmitters. This mechanism ensures the rapid and efficient transmission of information throughout the body.
See lessIn a genetic experiment, plants with pure round green seeds (RRyy) were crossed with plants with wrinkled yellow seeds (rrYY). (i) Show the gametes formed when F1 was self-pollinated. (ii) A total of 144 seeds were produced which developed into saplings. Show the ratio in which these traits are independently inherited in these 144 saplings.
In the cross RRyy × rrYY, the F₁ plants are RrYy (round yellow). Gametes formed are RY, Ry, rY, ry. On self-pollination, the F₂ generation shows independent assortment of traits, producing a phenotypic ratio of 9 round yellow : 3 round green : 3 wrinkled yellow : 1 wrinkled green. If 144 seeds are pRead more
In the cross RRyy × rrYY, the F₁ plants are RrYy (round yellow). Gametes formed are RY, Ry, rY, ry. On self-pollination, the F₂ generation shows independent assortment of traits, producing a phenotypic ratio of 9 round yellow : 3 round green : 3 wrinkled yellow : 1 wrinkled green. If 144 seeds are produced, the numbers are 81, 27, 27, and 9 respectively. This experiment demonstrates Mendel’s Law of Independent Assortment.
See less