29 Questions
Which plant hormone is known to delay senescence in leaf tissues and promote mitosis?
Cytokinins
What is the primary effect of gibberellins on plant growth and development?
Stimulating shoot elongation
Which plant hormone accumulates in response to environmental stresses like dehydration or cold temperatures?
Abscisic acid
What is the primary effect of ethylene on plant development?
Promoting fruit ripening, flower wilting, and leaf fall
Which plant hormone is unusual in that it is a volatile gas?
Ethylene
What is the primary function of the plant hormone systemin?
Activating plant responses to herbivore wounds
How do plants in dry habitats, like xerophytes, reduce water loss?
By having a waxy coating on leaves and stems
What is the key function of vacuoles in plant cells concerning water management?
Balancing water levels inside the cell
Which type of plant can easily get more water from the soil and may have a waxy coating to prevent water loss?
Mesophytes
What is the role of kidneys in animals' excretory system concerning water balance?
Filtering blood and absorbing water
Which hormone is responsible for controlling water absorption in the kidneys?
ADH
How do plants in water environments, like hydrophytes, absorb water?
By absorbing it directly through their surfaces
What is the main function of the Central Nervous System (CNS)?
Sends commands to the body
Which part of the nervous system prepares the body for 'fight-or-flight' responses?
Sympathetic Nervous System
How does the endocrine system primarily signal within the body?
By using chemical signals called hormones
Which system helps maintain balance in the body through negative feedback mechanisms?
Endocrine System
Which hormone works to keep blood sugar levels stable?
Insulin
What is the role of the Parasympathetic Nervous System?
Is active during restful periods like slowing heart rate
Which plant hormone plays a crucial role in initiating the ripening process of fruits?
Ethylene
What is the primary function of stomatal opening in plants?
Enable gas exchange for photosynthesis
In drought conditions, what is the immediate response of plants to conserve water?
Closing stomata
Which type of plant movement describes a rapid response to touch stimuli?
Fast thigmotropism
What is the primary function of imbibition (water intake) during seed germination?
Trigger the breakdown of dormancy mechanisms
What is the main function of osmoregulation in organisms?
To maintain the right balance of water and salts
Which type of organisms typically exhibit osmoconformers osmoregulation?
Marine invertebrates
What strategy do bacteria use when the osmolarity around them increases?
Use transport mechanisms to absorb electrolytes
Which process do protozoa use to transport ammonia and excretory wastes from the cytoplasm to the cell membrane?
Contractile vacuoles
What distinguishes osmoregulators from osmoconformers?
Osmoregulators maintain the same internal osmolarity as the environment
What is the main purpose of synthesizing osmoprotectant molecules in bacteria?
To protect against osmotic stress
Test your knowledge on how plants regulate water through stomata, vacuoles, and adaptations. Learn about the different types of plants and their water management techniques.
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