1. Why does the species benefit from variation but not necessarily the individual?
1. Why does the species benefit from variation but not necessarily the individual?
Explanation :
Because occasionally the climatic changes have a significant effect on the species, making it harder for them to survive, the variety is advantageous to the species rather than to individuals. For instance, certain types of microorganisms may perish if the temperature of the body of water rises. The environment could be disturbed as a result of this. Therefore, variation benefits species rather than individuals.
2. Why does the species benefit from variation but not necessarily the individual ?
2. Why does the species benefit from variation but not necessarily the individual ?
Explanation :
Because occasionally the climatic changes have a significant effect on the species, making it harder for them to survive, the variety is advantageous to the species rather than to individuals. For instance, certain types of microorganisms may perish if the temperature of the body of water rises. The environment could be disturbed as a result of this. Therefore, variation benefits species rather than individuals.
3. Which area of the brain keeps the body in its proper position and balance.
3. Which area of the brain keeps the body in its proper position and balance.
Explanation :
The cerebral region called the cerebellum is in charge of regulating motor activity. As a result, it is the body part involved in maintaining the body’s balance and posture.
4. How can we tell if an agarbatti (incense stick) smells?
4. How can we tell if an agarbatti (incense stick) smells?
Explanation:
The nose can sense the aroma of an agarbatti. The nose’s olfactory receptors transmit electrical signals to the frontal lobe of the brain. This signal is perceived by the frontal lobe as the scent of the incense stick.
5. What part of reflex action does the brain play?
5. What part of reflex action does the brain play?
Explanation:
In reaction to a stimuli that gives little time for thought, reflex actions are generated instantly. As an illustration, the nerves that control hand movement are linked to the sensory nerves that perceive heat. The reflex arc is a relationship between the nerve signal being detected (input) and the rapid response to it (output).
The spinal cord produces reflex actions, and the information also gets to the brain. This aids the brain's ability to remember and store this event for later use. The brain enables the person to become aware of the stimulus and foresee potential risk in the circumstance.
6. How do plant hormones work?
6. How do plant hormones work?
Explanation :
Plant hormones are chemical compounds that a plant produces at specific locations and distributes to other areas as needed. Plant hormones aid in coordinating growth, development, and environmental reactions. An illustration would be cytokines, abscisic acid, and ethylene.
7. How do the movements of a shoot toward light and the leaves of a sensitive plant vary from one another?
7. How do the movements of a shoot toward light and the leaves of a sensitive plant vary from one another?
Explanation:
8. Describe a plant hormone that encourages development.
8. Describe a plant hormone that encourages development.
Explanation :
The hormones responsible for plant growth are auxins and gibberlins.
Auxins control growth as well as the elongation of cells in shoots.
Germination and stem extension are caused by gibberlin.
9. How can auxins encourage a tendril to grow around a support?
9. How can auxins encourage a tendril to grow around a support?
Explanation :
The hormones secreted by plants at the terminals of roots and shoots are known as auxins. Tendrils have auxins at their tips. Auxins are sensitive to touch, thus when tendrils are wrapped around a support, their growth is halted. As a result, they shift to the opposite side of the tip in search of support, with the tendril bending in that direction as the opposite side of the tendril grows more quickly than the side that is in contact with the support
10. Create a test to illustrate hydrotropism.
10. Create a test to illustrate hydrotropism.
Explanation :
To show how plants use hydrotropism.
Procedure:
Place a seedling in a soil-filled container.
Place a permeable container filled with water next to the seedling.
Wait a few days to use the setup.
Observation:
When the roots are examined, it is found that they develop unevenly and slant toward the source of water.
Results :
As the roots slant toward the porous water container, it demonstrates that plants exhibit hydrotropism. Hydrotropism is a type of plant growth response in which a gradient in the concentration of water determines the direction of growth.
11. How do animals coordinate their chemical reactions?
11. How do animals coordinate their chemical reactions?
Explanation:
Animals use chemical messengers known as hormones to coordinate their chemical processes. Chemicals called hormones are released by particular endocrine glands. Animal homeostasis, growth, and development are all governed by hormones.
12. Why is it advisable to use iodized salt?
12. Why is it advisable to use iodized salt?
Explanation :
Use of iodized salt is advised to prevent iodine deficiency. Low iodine consumption will result in less thyroxine being released from the thyroid gland. This has an impact on protein, carbohydrate, and fat metabolism. As a result, if iodine consumption is reduced, a person may get goiter.
13. How does the release of adrenaline into the blood affect our body's reaction?
13. How does the release of adrenaline into the blood affect our body's reaction?
Explanation :
A person's body releases the hormone adrenaline when they are scared or emotionally unbalanced. Heartbeat speeds up as a result of adrenaline reaching the heart, increasing blood flow to the muscles. Due to the diaphragm and rib muscles' contractions, adrenaline also speeds up breathing. Additionally, adrenaline rush raises blood pressure and facilitates the admission of more glucose into the blood. All of these take place as a result of our body reacting to the release of adrenaline into our blood.
14. Why do some diabetic individuals have insulin injections as part of their treatment?
14. Why do some diabetic individuals have insulin injections as part of their treatment?
Explanation :
A person with diabetes has pancreatic cells that no longer produce or produce less of the hormone insulin. By converting excess glucose to glycogen, insulin controls blood sugar levels. A person’s blood glucose level is impacted when insulin is not created adequately, which has negative implications. Diabetes patients receive insulin injections as part of their treatment to keep their blood glucose and insulin levels stable.
15. Of the following, which one is a plant hormone?
Insulin
Thyroxine
Oestrogen
Cytokine
15. Of the following, which one is a plant hormone?
Insulin
Thyroxine
Oestrogen
Cytokine
Explanation :
The answer is cytokine (iv)
Insulin, thyroxin, and oestrogen are hormones made by animals, but cytokinin is a hormone generated by plants.
16. A is the term used to describe the space between two neurons.
Dendrite,
The synapse
Axon.
Impulse.
16. A is the term used to describe the space between two neurons.
Dendrite,
The synapse
Axon.
Impulse.
Explanation :
The answer is (ii) Synapse.
dendrite is a small, branched outgrowth of a nerve cell through which synaptic impulses from other cells are passed on to the cell body.
In vertebrates, an axon or nerve fiber is a long, slender projection of a nerve cell or neuron that normally transports electrical impulses known as action potentials away from the nerve cell body. The axon’s job is to carry signals to various neurons, muscles, and glands.
An electrical signal called an impulse passes down an axon.
17. A person’s brain is in charge of
Thought.
Managing heartbeat.
The body’s balance heartbeat.
All of the aforementioned possibilities.
17. A person’s brain is in charge of
Thought.
Managing heartbeat.
The body’s balance heartbeat.
All of the aforementioned possibilities.
Explanation :
Answer (d) is all of the above.
The brain balances the body, controls heartbeat, and is responsible for thought.
18. What role do receptors play in the body? Consider scenarios in which receptors malfunction. Which issues are most likely to occur?
18. What role do receptors play in the body? Consider scenarios in which receptors malfunction. Which issues are most likely to occur?
Explanation :
Our body has receptors, particularly in the sensory organs. Receptors gather information about changes in the environment and transmit it to the brain, which processes the information and reacts to the change. When receptors are not functioning properly, environmental cues cannot trigger nerve impulses, and the body cannot react.
19. Explain how a neuron works while drawing the structure of the cell.
19. Explain how a neuron works while drawing the structure of the cell.
Explanation :
As functional components of the neurological system, neurons are nerve cells. Axons, dendrites, and the cell body make up the three primary components of neurons.
Information is detected and sent to the cell body by dendrites.
Body of the cell: Supports cell growth.
Messages are carried via the axon, which also signals the next neuron, away from the cell body.
20. How can plants experience phototropism?
20. How can plants experience phototropism?
Explanation :
Phototropism is the term used to describe a plant’s directional growth and movement in reaction to light. Auxin levels rise on the dark side and fall on the light side, causing phototropism. A leaf on the darker side grows more quickly due to the presence of more auxin, leading it to bend towards the direction of the light source.
21. Which signals will be interfered with in the event of spinal cord damage?
21. Which signals will be interfered with in the event of spinal cord damage?
Explanation :
Both the impulses arriving from the nerves and the signals going to the receptors will be messed up in the event of a spinal cord injury. These two signals combine in a spinal cord bundle. Thus, both of these signals are interfered with.
22. How do plants coordinate their chemical processes?
22. How do plants coordinate their chemical processes?
Explanation :
Hormones are a unique class of chemical compounds that regulate and coordinate plant growth, development, and reactions to the environment. A portion of the plant produces hormones, which are then distributed to all the areas that require them. The five main categories of photocomposes are ethylene, auxins, gibberellins, cytokines, and abscise acid. These photocomposes are either growth promoters or growth inhibitors, including auxins, gibberellins, cytokines, and ethylene.
23. Why does an organism need a system of control and coordination?
23. Why does an organism need a system of control and coordination?
Explanation :
An organism has a variety of organs. For an organism to survive, these organs must be carefully managed and coordinated. The glands of the endocrine system secrete a variety of fluids into an organism’s body. These hormones are in charge of an organism’s general growth and development. The central nervous system is in charge of all additional daily decisions, both voluntary and involuntary. (CNS).
Every action we take as humans requires coordination. Our nervous system takes in information from our environment, processes it, and then triggers a reaction. The integration of diverse metabolic processes including reproduction, development, and all reflexes is facilitated by the endocrine system (hormonal system).integrates a variety of metabolic processes, including reproduction, development, and all reflex movements (cope up with various give up situations).
Plants’ hormone systems aid in photosynthesis, which requires carbon dioxide, water, and sunlight. The hormonal system of the plant body supports the tendrils in climbing plants, the roots bend toward water, the stem grows toward sunshine, and the stomatal aperture in leaves opens up to allow in carbon dioxide gas.
Therefore, an organism needs a control and coordinating system.
24. What distinguishes reflex actions from involuntary actions?
24. What distinguishes reflex actions from involuntary actions?
Explanation :
25. Analyze the control and coordination processes controlled by the neurological and hormonal systems in animals.
25. Analyze the control and coordination processes controlled by the neurological and hormonal systems in animals.
Explanation :
