CBSE 11TH BIOLOGY - Online Test
Q1. The asexual reproduction in fungi takes place by
Answer : Option D
Explaination / Solution:
Asexual reproduction in fungi is by spores called conidia or sporangiospores or zoospores, and sexual reproduction is by oospores, ascospores and basidiospores.
Q2. Which one is not a reason of mineral depletion in the soil?
Answer : Option D
Explaination / Solution:
Mineral deficiency in soil may be due to use of high yielding varieties, non-rotation of crops and leeching of minerals. Growing leguminous plants do not deplete the mineral in soil.
Q3. 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.
Q4. A region on retina of human eye which is free from rods and cones is :
Answer : Option A
Explaination / Solution:
The optic nerves leave the eye and the retinal blood vessels enter it at a point medial to and slightly above the posterior pole of the eye ball. Photoreceptor cells are not present in that region and hence it is called the blind spot.
Q5. Asexual reproduction in liverworts takes place by specialised structures, commonly known as
Answer : Option D
Explaination / Solution:
Asexual reproduction in liverworts takes place by the formation of specialised structures called gemmae (sing. gemma). Gemmae are green, multicellular, asexual buds, which develop in small receptacles called gemma cups located on the thalli. The gemmae become detached from the parent body and germinate to form new individuals.
Q6. Lipid molecules of plasma membrane occur
Answer : Option A
Explaination / Solution:
The lipid molecules occur in chains. In plasma membrane two molecular chains of lipids remain parallel to each other.
Q7. The stroma of chloroplast contains
Answer : Option D
Explaination / Solution:
In stroma, enzymatic reactions incorporate into the plant leading tothe synthesis of sugar, whichare not directly light driven but are dependent on the products of light reactions (ATP and NADPH). Hence, to distinguish the latter they are called, by convention, as dark reactions. However, this should not be construed to mean that they occur in darkness or that they are not lightdependent.
Q8. Air breathing animals lose a large amount of precious water from their respiratory surface through :
Answer : Option C
Explaination / Solution:
Water is released in atmosphere along with expired air during respiratory cycle. Air breathing animals lose a large amount of precious water from their respiratory surface through evaporation.
Q9.
Match the following :
| Hormone | Synonym |
| a) Adrenaline | i) birth hormone |
| b) Oxytocin | ii) moulting hormone |
| c) Ecdyson | iii)luteotropic hormone |
| d) Prolactin | iv) fight or flight hormone |
Answer : Option A
Explaination / Solution:
Adrenaline hormone is called fight and flight hormone. Oxytocin is called birth hormone. Ecdyson is called moulting hormone and prolactin is called as luteotropic hormone.
Q10. Which one of the following is a living fossil?
Answer : Option D
Explaination / Solution:
Limulus (the king crab or horse-shoe crab) continues to remain unchanged for past 190 million years. It is therefore, also called living fossil. Excretion occurs through four pairs of coxal glands. Respiration occurs through book gills.
