Biology - Online Test
Q1. 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.
Q2. 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.
Q3. During agarose gel electrophoresis DNA fragments moves towards anode. This is because
Answer : Option B
Explaination / Solution:
To separate DNA using agarose gel electrophoresis, the DNA is loaded into pre-cast wells in the gel and a current applied. The phosphate backbone of the DNA (and RNA) molecule is negatively charged, therefore when placed in an electric field, DNA fragments will migrate to the positively charged anode.
Q4. 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.
Q5. Which one of the following experiments suggests that simplest living organisms could not have originated spontaneously from non-living matter
Answer : Option D
Explaination / Solution:
Simplest organisms could not have originated spontaneously from non-living matter. This can be shown as meat was not spoiled when heated and kept sealed in vessels.
Q6. 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
Q7. 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.
Q8. 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.
Q9. 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.
Q10. Micropropagation is technique
Answer : Option C
Explaination / Solution:
Micropropagation is the technique of growing large number of plantlets using small parts of plants. Plant parts are totipotent or able to generate whole plant with small portion. This process is also called as tissue culture in which true type of plants.
