CBSE 11TH BIOLOGY - Online Test
Q1. All of the following organs help in excretion except :
Answer : Option B
Explaination / Solution:
Lungs help in excretion of carbon dioxide, liver help in excretion of toxic substance and skin help in removal of extra salts along with sweat. Heart is the organ that pumps the blood in body.
Q2. Silk produced by Antheraeamylitta is called
Answer : Option B
Explaination / Solution:
The silk produced by Antheraeamylitta is called Tasar silk. This silk is considered as most durable and best quality silk.
Q3. Bulliform or motor cells are present in
Answer : Option D
Explaination / Solution:
In isobilateral leaves of monocot, certain adaxial epidermal cells along the veins modify themselves into large, empty, colourless cells. These are called bulliform cells.
Q4. Related genera belongs to same
Answer : Option B
Explaination / Solution:
Family is the group of genera having some common properties. So, related genera belongs to same family.
Q5. A fundamental category of classification ranking below a genus is
Answer : Option B
Explaination / Solution:
The taxonomic hierarchy Kingdom -> Phylum/Division -> Class -> Order -> Family -> Genus -> Species. Hence, the correct option is Species.
Q6. In higher plants, the growing apical bud inhibits the growth of the lateral buds. This phenomenon is called
Answer : Option D
Explaination / Solution:
Apical dominance is the phenomenon whereby the main, central stem of the plant is dominant over (i.e., grows more strongly than) other side stems; on a branch the main stem of the branch is further dominant over its own side branchlets.
Q7. The joint present between the carpals is
Answer : Option D
Explaination / Solution:
Many gliding joints are formed in the appendicular skeleton between the carpal bones of the wrist; between the carpals and the metacarpals of the palm; between the tarsal bones of the ankle; and between the tarsals and the metatarsals of the foot.
Q8. Which one of the following is correct pairing of a body part and muscle fibre that moves it?
Answer : Option C
Explaination / Solution:
The iris contains involuntary smooth muscles. It encircles the pupil of the iris and helps to dilate the pupil when there is insufficient light for the normal function of the eye.
Q9. In which class of fungi the mushroom belongs to
Answer : Option D
Explaination / Solution:
The mushroom belongs to class Basidiomyces to kingdom fungi. Basidiomycetes produce basidiospores as reproductive units. The member of this group grows on dead and decaying matters.
Q10. The neighbouring cells are connected through cytoplasmic strands that extend through
Answer : Option A
Explaination / Solution:
Neighbouring cells are connected through cytoplasmic strands that extend through plasmodesmata. During symplastic movement, the water travels through the cells – their cytoplasm; intercellular movement is through the plasmodesmata.
