CBSE 11TH BIOLOGY - Online Test
Q1. In taxonomic hierarchy, the various categories are arranged in
Answer : Option A
Explaination / Solution:
Kingdom -> Phylum/Division -> Class -> Order -> Family -> Genus -> Species. Hence, the correct option is Descending order.
Q2. Which hormone is responsible for dormancy?
Answer : Option A
Explaination / Solution:
Abscistic acid encourages fruit to drop and leaves to fall. When the plant is low on water abscistic acid closes the stomata, pores in the leaves. It encourages both seeds and plants to go dormant.The hormone induces seeds to produce proteins to store when the seeds are dormant.
Q3.
Match the following bones and their synonyms :
column A
a) Hipbone
b) Kneebone
c) Collarbone
d) immovable joint
column B
i) patella
ii) clavicle
iii) suture
iv) innominate
Answer : Option B
Explaination / Solution:
Hip bone is called as innominate bone, kneebone is called as patella, collarbone is called as clavicle and immovable joint is called suture.
Q4. Nasal septum contains
Answer : Option A
Explaination / Solution:
The nasal septum of human beings consist of hyaline cartilage which is highly elastic having collagen. It contains no nerves or blood vessels and is pearly bluish in colour.
Q5. A water melon has water percentage about
Answer : Option C
Explaination / Solution:
Each bite of watermelon contains about 92 percent water and 6 percent sugar. Since it consists mostly of water, its name makes perfect sense! Despite being mostly water with a bit of sugar, watermelon is considered a very healthy snack. Its high water content helps keep you hydrated.
Q6. Diatoms do not decay easily because
Answer : Option D
Explaination / Solution:
The walls of the diatoms are embedded with silica and thus the walls are indestructible.
Q7. Identify the part of nodule marked X
Answer : Option B
Explaination / Solution:
The figure shown above is the nodule formation in leguminous roots. The part marked as ‘x’ shown is figure is infection thread through which Rhizobium enters the root.
Q8. Which of the following is not secreted from its source in the form of a Zymogen :
Answer : Option D
Explaination / Solution:
Zymogen is an inactive enzyme precursor that require biochemical change to become active. Amylase enzyme is not released from its source in the form of proenzyme or zymogen.
Q9. Human internal ear is :
Answer : Option A
Explaination / Solution:
Human body is triploblastic in nature, ectoderm, mesoderm and endoderm. These three layers of embryo forms the different organs of human beings. Human internal ear is ectodermal in origin.
Q10. Thallus of Riccia is
Answer : Option D
Explaination / Solution:
Riccia is a genus of liverworts in the order Marchantiales. In bryophytes, plant body is generally haploid (n) that alternate with diploid form for shorter period. The thallus of Riccia is Halploid.
