CBSE 11TH BIOLOGY - Online Test
Q1. Which one of the following organism help in absorption of phosphorus from soil by plants
Answer : Option B
Explaination / Solution:
Glomus is a kind of algae found in soil. This organism help in absorption of phosphorous form soil by plants.
Q2. The process by which small electrolytes are absorbed
Answer : Option B
Explaination / Solution:
Small amounts of monosacharides like glucose, amino acids and some of electrolytes like chloride ions are generally absorbed by simple diffusion.
Q3. In the process of eye donation a particular part of a dead man’s eye is stored and grafted on another person’s eye to restore vision. That donated part of eye is :
Answer : Option D
Explaination / Solution:
Eye donation process involves grafting of cornea of dead man’s eye, which is stored and grafted on another person’s eye to restore vision.
Q4. The giant redwood tree is
Answer : Option D
Explaination / Solution:
One of the gymnosperms, Giant sequoias are the world's largest single tree with an average height of 50–85 m (164–279 ft) and 6–8 m (20–26 ft) in diamete
Q5. Elaioplasts belongs to
Answer : Option D
Explaination / Solution:
The leucoplasts are the colourless plastids of varied shapes and sizes with stored nutrients. Leucoplast includes:
a) Amyloplasts storing carbohydrates.
b) Elaioplastsstoring oils and fats and
c) Aleuroplasts storing proteins.
Q6. Which is the most effective wavelength of light for photosynthesis?
Answer : Option B
Explaination / Solution:
Certain red and blue wavelengths of light are the most effective in photosynthesis because they have exactly the right amount of energy to energize, or excite, chlorophyll electrons and boost them out of their orbits to a higher energy level.
Q7. The solubility of carbon dioxide is
Answer : Option C
Explaination / Solution:
The solubility of carbon dioxide is 20-25 times higher than that of oxygen, the amount of carbon dioxide that can diffuse through the diffusion membrane per unit difference in partial pressure is much higher compared to that of oxygen.
Q8.
Secretion of aldosterone is stimulated by :
i. decrease in sodium ion concentration in the plasma.
ii. decrease in potassium ion concentration in the plasma.
iii. decrease in the volume of blood.
Answer : Option C
Explaination / Solution:
If decreased blood pressure is detected, the adrenal gland is stimulated by these stretch receptors to release aldosterone, which increases sodium reabsorption from the urine, sweat, and the gut. This causes increased osmolarity in the extracellular fluid, which will eventually return blood pressure toward normal.
Q9. Which group of chordates possesses sucking and circular mouth without jaws?
Answer : Option C
Explaination / Solution:
The organism beloging to class Cyclostomes have a sucking and circular mouth without jaws.They are primitive vertebrates. The cyclostomes are marine or fresh-water vertebrates.
Q10. The plant cell wall are made up of
Answer : Option B
Explaination / Solution:
Plant cell walls are made of cellulose. Paper made from plant pulp is cellulose.
