Excretory Products and their Elimination: Class 11 Biology Q&A
6 free answers on Excretory Products and their Elimination (Biology) for Class 11 students, across CBSE, ICSE and State boards. Includes questions such as “What are the external features of a leech?”, “What are the key anatomical features of Aphrodite marine worm?”, “Identify the labeled parts of Holothuria (sea cucumber) from a biological diagram.”
Question & Answer
Questions
- BiologyClass 11CBSE
What are the external features of a leech?
Prostomium, eyes, mouth, anterior sucker, velum, nephridiopores, male and female genital pores, segmental receptor organs, posterior sucker, anus.<img width="307px;" height="456px;" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAsoAAARkCAYAAABrUDLkAAAQAElEQVR4Aex9B4AcR5V2dU/a2ZxzVM7ZtmzLsi3bck44BzBw5o58HBwcBxwH/GQDBwfYRAO2cc5ylqMky8o5p5U2a3Oenfy/r6arp7qnJ+xqJduc7P76vXrve69eVfd01/SMdtQzz/ll+DROz8Hpc+D0OXD6HDh9Dpw+B06fA6fPgdPnwOlzwHgOqOz0f6dn4PQMnJ6Bf6gZOD2Y0zNwegZOz8DpGTg9A+MzA/JCO
- BiologyClass 11CBSE
What are the key anatomical features of Aphrodite marine worm?
Palp, notopodial bristles, stiff chaetae, iridescent bristles, neuropodial chaetae, anus.<img width="302px;" height="451px;" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAsAAAAQ6CAYAAABK9suqAAAQAElEQVR4AeydB5wkVdX2q3tmdjaxbGIlSUYUUVAMoJjAnLMYMGBYURQQXUUMLwoGJGcQVEBUVMCECQUERHIQkLjEZXPOu5O+8z/3nqpbsat7ZuF9P+FXzz3nPOc5596qru6+09M7NF/0khOGnsJT1+Cpe+Cpe+Cpe+Cpe+Cpe+Cpe+Cpe+Cpe+C/5R5oRu6/ITFPIYqeugZPXYOn7oH/mnvgqef7U6/7T90DT90DT90D/6X3QGQb4KjZbKx8Ck9dg6fugafugafugafugf9v7oGGPJYbEA3p/R
- BiologyClass 11CBSE
Identify the labeled parts of Holothuria (sea cucumber) from a biological diagram.
Crown of tentacles – used for feeding.Introvert – retractable part of the body.Podia of ventral ambulacra – tube feet for locomotion.Inter-radiae – areas between the ambulacral regions.Anus – posterior opening for excretion.<img width="241px;" height="456px;" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAfgAAAO6CAYAAABzJ0UxAAAQAElEQVR4Aez9B4AURbc+Dlf3zOxsZgNLzjlJDoIgogJmFAOIiKiIiKiIYkBBxYyKiCIIKIgYQMFAVJQgiOScc1hgWVg2h9npmfnOU93V0z3TMzuLvvfe7/d/lzp1Tj3nOaeqw3R1dc8
- BiologyClass 11CBSE
Read the diagram and provide a concise explanation
A marine polychaete worm showing differentiation between non-sexual and sexual body regions.Non-sexual region (Atoke): Ordinary parapodia used for movement.Sexual region (Epitoke): Modified swimming parapodia adapted for reproduction.Function: Locomotion and reproduction in marine environments.<img width="266px;" height="467px;" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAb4AAAM/CAYAAACu/re9AAAQAElEQVR4Aey9BXwcR9I+XFpJli3ZkiyZmZk9Zuag4zA7icOJk0sueIELJ5fkcg5znDh2HFPM
- BiologyClass 11CBSE
How does the renin-angiotensin-aldosterone system (RAAS) regulate blood pressure and volume?
A fall in blood pressure in the afferent arteriole stimulates the juxtaglomerular apparatus (JGA) to release renin. Renin converts angiotensinogen into angiotensin I, which is converted to angiotensin II by ACE. Angiotensin II causes vasoconstriction and stimulates the adrenal cortex to secrete aldosterone. Aldosterone increases Na⁺ and water reabsorption in the distal convoluted tubule, raising blood volume and pressure. When blood pressure rises, the JGA is inhibited.<img width="790p
- BiologyClass 11CBSE
How does ADH regulate blood osmolarity through feedback mechanisms?
When blood osmolarity rises above 300 mOsm/L, osmoreceptors in the hypothalamus stimulate thirst and trigger the pituitary gland to release ADH. ADH increases water reabsorption in the distal convoluted tubule, diluting blood and restoring osmolarity. When osmolarity falls below the set point, ADH secretion is inhibited, maintaining homeostasis.<img width="758px;" height="329px;" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAA1EAAAFxCAYAAACStiK1AAAQAElEQVR4Aex9B5wUVfZ1dZqenGDIOQcD