CBSE 11TH BIOLOGY - Online Test
Q1. The limbless amphibian is
Answer : Option A
Explaination / Solution:
Ichthyophis is an amphibian which is limbless. Sometimes called as Asian caecilians. They are found in southeast Asia and the southern Philippines.
Q2. Number of fatty acid residues found in one molecules of fat is
Answer : Option D
Explaination / Solution:
Fat consists of molecules of fatty acids and molecules of glycerin. Each molecule of fat contain three molecules of fatty acids and one molecule of glycerine.
Q3. Aerobic respiration is common in
Answer : Option D
Explaination / Solution:
Aerobic respiration is the process that leads to a complete oxidation of organic substances in the presence of oxygen, and releases carbon dioxide, water and a large amount of energy present in the substrate. This type of respiration is most common in higher organisms.
Q4. Chromosome appeared beaded during
Answer : Option A
Explaination / Solution:
Chromosome appeared beaded during leptotene stage of prophase of meiosis I due to the distinct appearance of nucleosomes. Chromatin materials start condensing after that stage.
Q5. Locomotory organ of annelida is
Answer : Option A
Explaination / Solution:
Locomotory organ of annelia is parapodia. Parapodiumare in form of lateral fleshy protrusions on the body surface that help in movement and capturing food.
Q6. In the following pictorial representation of Kreb’s Hensleit cycle, find out 1,2& 3 ?
Answer : Option B
Explaination / Solution:
Kreb’s Hensleit cycle is the sequence of chemical reaction occurring primarily in the liver that results in the production of urea. In this cycle ammonia is fist converted into citrulline along with carbon dioxide that change into arginine and finally into ornithine.
Q7. Reticulate veination is characteristic in
Answer : Option C
Explaination / Solution:
Reticulate venation: In this type, the veins branch and unite forming a complicated network, All the veins are interconnected, like the strands of the net. Leaves of ‘Dicot plants’ generally have reticulate venation e.g., Hibiscus, Redgram
Q8. A group of closely related classes is called
Answer : Option C
Explaination / Solution:
Genus comprises a group of related species, Family has a group of related genera, order has a group of related family. Hence, the correct option is Phylum.
Q9. Abscissic acid is also known as
Answer : Option D
Explaination / Solution:
ABA stimulates the closure of stomata in the epidermis and increases the tolerance of plants to various kinds of stresses.Therefore, it is also called the stress hormone.
Q10. In rosette plants, bolting is due to
Answer : Option C
Explaination / Solution:
Gibberellins also promote bolting (internode elongation just prior to flowering) in beet, cabbages and many plants with rosette habit.
