CBSE 11TH BIOLOGY - Online Test
Q1. Look at the following figure of myofibrils
figure (1), (2), (3), (4) : showing ?
figure (1), (2), (3), (4) : showing ?
Answer : Option D
Explaination / Solution:
Myofibrils are present in muscles fibers which are parallelly arranged filaments in sarcoplasm. Figure 1 and 2 present relaxed state while figure 3 and 4 represents cross bridge formation.
Q2. Oozing of water drops from injured leaf edges is
Answer : Option A
Explaination / Solution:
Water drops comes out from theinjured leaf edges of leaves. This oozing of water drop from injured leaf edges is called leaf bleeding.
Q3. The fibre that can't be made to contract merely by thinking about it, is the
Answer : Option B
Explaination / Solution:
Smooth muscles are ‘involuntary’ muscles as they can't be directly controlled. We usually are not able to make it contract merely by thinking about it as we can do with skeletal muscles. Involuntary muscles are under control of medulla oblongata and part of cerebrum. Smooth muscles are spindle shaped or fusiform, uninucleated and unstraited fibres.The wall of internal organs such as the blood vessels, stomach and intestine contains this type of muscle tissue.
Q4. Which of the following type of classification based on a few morphological characters
Answer : Option A
Explaination / Solution:
Artificial classification is based on a few morphological characters of organisms like flower shape, stem type and types of seeds.
Q5. Thermostat for the body is :
Answer : Option D
Explaination / Solution:
The body keeps its core temperature constant at about 37o Celsius by physiological adjustment controlled by hypothalamus, so called thermostat center.
Q6. Micronutrients which is component of all organic compounds but not obtained from soil
Answer : Option D
Explaination / Solution:
Most of the micronutrients are obtained from soil. Micronutrient which is present in all organic compounds is carbon that is not obtained from soil.
Q7. Which layer of alimentary canal forms villi?
Answer : Option C
Explaination / Solution:
Mucosa layer forms irregular folds (rugae) in the stomach and small finger-like foldings called villi in the small intestine
Q8. The autonomic nervous system or ANS :
i. Is truly autonomic i.e. independent of the CNS.
ii. Is also known as the VNS.
iii. Transmit impulse from CNS to involuntary organs and smooth muscles.
i. Is truly autonomic i.e. independent of the CNS.
ii. Is also known as the VNS.
iii. Transmit impulse from CNS to involuntary organs and smooth muscles.
Answer : Option B
Explaination / Solution:
The autonomic nervous system or ANS is the division of peripheral nervous system that influences the function of internal organs. ANS is also known as VNS. These nerves transmit impulse from CNS to involuntary organs and smooth muscles.
Q9. Agar is obtained from
Answer : Option D
Explaination / Solution:
Agar, one of the commercial products obtained from Gelidium are used to grow microbes and in preparations of ice-creams and jellies.
Q10. The smallest free living organism are
Answer : Option B
Explaination / Solution:
PPLO (Pleuro Pneumonia Like Organisms). They are generally smaller and multiply more rapidly than the eukaryotic cells.
