CBSE 11TH BIOLOGY - Online Test
Q1. The form of thalamus in which ovary is at tops and stamens, petals and sepals are born below is called
Answer : Option D
Explaination / Solution:
In hypogamous flowers the ovary is at tops and stamens, petals and sepals are borne below on the thalamus. The ovary is called superior.
Q2. In the metaphase stage, the chromosomes are made up of
Answer : Option A
Explaination / Solution:
At metaphase stage, the chromosome is made up of two sister chromatids formed due to longitudinal splitting of the chromatids, which are held together by the centromere.
Q3. If in glomerular capillaries, pressure of blood is 75 mm Hg, osmotic pressure of plasma proteins is 30 mm Hg, and hydrostatic pressure of fluid in renal tubule is 25 mm Hg then net force or the filtration pressure will be calculated as :
Answer : Option D
Explaination / Solution:
Net force of filtration pressure is equal to the blood pressure of glomerular capillaries minus sum of the osmotic pressure of plasma and hydrostatic pressure of fluid in renal tubule. So, filtration pressure = 75 – [ 30 + 20 ] mm Hg.
Q4. The casparian thickening occurs in the cells of
Answer : Option C
Explaination / Solution:
The tangential as well as radial walls of the endodermal cells have a deposition of water-impermeable, waxy material-suberin-in the form of casparian strips.
Q5.
If is the final size, is initial size, r is growth rate and t is time of growth than Exponential growth is represented by
Answer : Option A
Explaination / Solution:
Exponential growth is represented by initial size and growth rate and time. If is the final size, is the initial size, r is growth rate and t is the time of growth than exponential growth is
Q6. Example of interspecific hybrid is
Answer : Option C
Explaination / Solution:
Tigon and liger are produced by hybridization of tow interspecific species. Although hybridization generally takes place between same species.
Q7.
Match the following :
Animal
a) Sphyrna
b) Pediculus
c) Asterias
d) Metridium
type of skeleton
i) exoskeleton
ii) hydrostatic skeleton
iii) cartilaginous skeleton
iv) endoskeleton
Answer : Option A
Explaination / Solution:
Different kinds of skeleton system is found in different organisms. Sphyma contain cartilaginous skeleton. Pediculus contain exoskeleton. Asterias contain endoskeleton and Metridium contains hydrostatic skeleton.
Q8. otal water content presenTt in the soil is called
Answer : Option B
Explaination / Solution:
Total water content present in the soil is called holard. Out of this, the water which can be absorbed by the plant is called chresard and remaining is called echard.
Q9. Which of the following structure is Ectodermal in origin?
Answer : Option D
Explaination / Solution:
The ectoderm differentiates to form the nervous system (spine, peripheral nerves and brain), tooth enamel and the epidermis, the outer part of integument. It also forms the lining of mouth, anus, nostrils, sweat glands, hair and nails.
Q10. The organism that completely lack a cell wall and are smallest living cell known that can survive without oxygen is
Answer : Option A
Explaination / Solution:
Mycoplasma is a genus of bacteria that lack a cell wall around their cell membrane. Without a cell wall, they are unaffected by many common antibiotics such as penicillin or other beta-lactam antibiotics that target cell wall synthesis.
Mycoplasma species are the smallest bacterial cells yet discovered,can survive without oxygen, and come in various shapes. For example, M. genitalium is flask-shaped.
