CBSE 11TH BIOLOGY - Online Test
Q1. What are the unlabeled a, b & c in the given flow chart ?
Answer : Option D
Explaination / Solution:
Renin convert angiotensin I to angiotensin II which activates adrenal cortex to release aldosterone. Aldosterone helps to reabsorption of sodium and water from DCT.
Q2. The shape of guard cells in grasses is
Answer : Option B
Explaination / Solution:
Dumb-bell-shaped guard cells are found in grasses. Dumb-bell shaped guard cells are more advanced in evolutionary terms and more efficient physiologically because guard cells of grasses require fewer solutes and less water to achieve a given unit increase in aperture.
Q3. Choose the correct sequence of taxonomic categories in descending order
Answer : Option A
Explaination / Solution:
The correct sequence of taxonomic categories form higher to lower are Division-Class-Order-Family-Genus-Species.
Q4. Auxin was isolated from tips of coloeptile of oat seedlings by
Answer : Option A
Explaination / Solution:
Auxin was first collected by F.W. Went (1928) from coleoptile tip of Avena. He also developed Avena curvature test for bioassay of auxin.
Q5. Select the correctly matched pair :
Answer : Option A
Explaination / Solution:
Last 2 pairs i.e., 11th and 12th of ribs are not connected ventrally and are therefore, called floating ribs.
Q6. Lymph contains
Answer : Option D
Explaination / Solution:
Lymph contains serum and WBC. Lymph is called as extracellular fluid that help in transport of fat and protein. It contains WBC, so also help in protection against the infection.
Q7. In fungi like ascomycetes and basidiomycetes, an intervening dikaryotic stage occur. Such condition is called
Answer : Option C
Explaination / Solution:
In fungi like ascomycetes and basidiomycetes, an intervening dikaryotic stage (n + n i.e. two nuclei per cell) occurs; such a condition is called a dikaryon and the phase is called dikaryo phase of fungus.
Q8. The absorption of water by seeds and drywood takes place by a special type of diffusion called
Answer : Option A
Explaination / Solution:
Imbibition is a special type of diffusion when water is absorbed by solids-colloids causing an enormous increase in volume. Examples include the absorption of water by seeds and dry wood.
Q9. They are compound or mixture of chemicals which are added to the soil in order to overcome deficiency of minerals
Answer : Option C
Explaination / Solution:
Fertilizers are compound or mixture of chemicals which are added to the soil in order to overcome deficiency of minerals. Fertilizers are added to restore the nutrient deficiency.
Q10. Which of the following is not a part of human alimentary canal?
Answer : Option B
Explaination / Solution:
The Ilium is the uppermost and largest bone of the pelvis in vertebrates. Duodenum jejunum and colon are parts of human alimentary canal but ileum is not a part of this system.
