CBSE 11TH BIOLOGY - Online Test
Q1. The arrows represent :[upward to downward]
Answer : Option C
Explaination / Solution:
The figure shows the muscular sac called the gall bladder. The duct of gall bladder (cystic duct) along with the hepatic duct from the liver forms the common bile duct.
Q2. In the following identify from up to down :
(i)&(ii)
(iii) & (iv)
(i)&(ii)
(iii) & (iv)
Answer : Option B
Explaination / Solution:
The reflex pathway comprises at least one afferent neuron (receptor) and one efferent (effectoror excitor) neuron appropriately arranged in a series. The (iii) and (iv) shows gray and white matter.
Q3. On germination, moss spore produce
Answer : Option D
Explaination / Solution:
The spore of moss germinate to produce protonema, which is a green, branched and frequently filamentous stage and develops a lateral bud which is called as secondary protonema or a leafy stage.Secondary protonema also gives rise to gametophore initials. Secondary protonema can undergo both sexual and asexual modes of reproduction. It reproduces asexually by the processes of budding and fragmentation. Sexual reproduction is the process which occurs in the leafy stage.
Q4. Which does not occur in cell membrane?
Answer : Option D
Explaination / Solution:
Cell membrane consists of phospholipids and protiens. Some cells also contain praline and cholesterol but glycolipid is not present in cell membrane.
Q5. The substances like ATP carry energy in
Answer : Option D
Explaination / Solution:
Living organisms have the capability of extracting energy from oxidisable substances and store this in the form of bond energy. Special substances like ATP, carry this energy in their chemical bonds.
Q6. The gaseous exchange portion of the human respiratory tract include/s :
Answer : Option D
Explaination / Solution:
Alveolar ducts are tiny ducts that connect the respiratory bronchioles to alveolar sacs, each of which contains a collection of alveoli (small mucus-lined pouches made of flattened epithelial cells). They are tiny end ducts of the branching airways that fill the lungs.
Q7. A chemical acts slowly, requiring hours to take effect. It may pass in and out of many cells in which they have no effect. When they find appropriate receptor in their target cell they bind to it. Chemical is :
Answer : Option B
Explaination / Solution:
Aldosterone hormone is a chemical that acts slowly, require hours to take effect. It may pass in and out of many cells in which they have no effect. When they find appropriate receptor in their target cell they bind to it to bring about changes.
Q8. Which of these is a fresh water sponge?
Answer : Option C
Explaination / Solution:
Spongilla is a genus of freshwater sponges in the family Spongillidae found in lakes and slow streams. Sponges of the genus Spongilla attach themselves to rocks and logs and filter the water for various small aquatic organisms such as protozoans, bacteria, and other free-floating pond life. Unlike marine sponges, freshwater sponges are exposed to far more adverse and variable environmental conditions, so they have developed gemmules as a means of dormancy.
Q9. Which of the following are aromatic amino acids?
Answer : Option D
Explaination / Solution:
Based on number of amino and carboxyl groups, there are acidic (e.g., glutamic acid), basic (lysine) and neutral (valine) amino acids. Similarly, there are aromatic amino acids (tyrosine, phenylalanine, tryptophan).
Q10. Which one is not a preparatory phase or energy spending phase of Glycoloysis
Answer : Option B
Explaination / Solution:
Formation of pyruvate is not a prerparatory phase or energy spending phase of Glycolysis. In this phase one ATP molecule is released.
