CBSE 11TH BIOLOGY - Online Test
Q1. Absorption of fats takes place through :
Answer : Option C
Explaination / Solution:
Lymph are the extracellular fluid that constitute the lymphatic system in human body. Absorption of fats takes place through lymphatic ducts. As fats cannot be carried through narrow capillaries.
Q2. Reticular activating system (RAC) of brain :
i. it works as a bridge to connect the lower brain to the upper brain.
ii. it helps usto focus on the important things and evade the useless things.
i. it works as a bridge to connect the lower brain to the upper brain.
ii. it helps usto focus on the important things and evade the useless things.
Answer : Option D
Explaination / Solution:
Reticular activating system (RAC) of brain works as a bridge to connect the lower brain to the upper brain. It helps to focus on the important things and evade useless things.
Q3. The structure formed by germinated fern spore is
Answer : Option A
Explaination / Solution:
Fern spores germinate to give rise to inconspicuous, small but multicellular, free-living, mostly photosynthetic thalloid gametophytes called prothallus.The gametophytes bear male and female sex organs called antheridia and archegonia.
Q4. Cytoskeleton is made of
Answer : Option D
Explaination / Solution:
An elaborate network of filamentous proteinaceous structures present in the cytoplasm is collectively referred to as the cytoskeleton.
Q5. On excitation, the electrons picked up by an electron acceptor is passed to
Answer : Option B
Explaination / Solution:
Electrons become excited and jump into an orbit farther from the atomic nucleus. These electrons are picked up by an electron acceptor which passes them to an electrons transport of cytochrome.
Q6. In CNS, regulation of respiratory rhythm during normal breathing is largely dependent upon :
Answer : Option D
Explaination / Solution:
In central nervous system, regulation of respiratory rhythm during normal breathing is dependent upon concentration of carbon dioxide gas in air.
Q7. Which of the following gas is found to work as a second messenger?
Answer : Option A
Explaination / Solution:
Second messengers are molecules that relay signals received at receptors on the cell surface to trigger physiological changes. Nitrogen oxide (NO) acts as second messenger.
Q8. In which of the organism, internal fertilisation is seen?
Answer : Option C
Explaination / Solution:
Most of the animals are not able to fertilize its own egg by sperms but in liver fluke, self-fertilization takes place. Earthworm also possess both male and female reproductive organ in same individual but not able to fertilize its own egg.
Q9. A polysaccharide present as storehouse of energy of plant tissues
Answer : Option B
Explaination / Solution:
Starch is a variant of this but present as a store house of energy in plant tissues.
Q10. As Soham, ages with chronic CAD the lumen of his coronary artery may get nearly completely obstructed Result is flow of blood to heart tissue is restricted such that the tissue receives inadequate supply of oxygen rich blood and this condition is diagnosed as :
Answer : Option C
Explaination / Solution:
In case of chronic CAD, the lumen of coronary artery may get nearly completely obstructed that results into restricted flow of blood to heart. The tissue receives inadequate bloods called myocardial ischemia.
