Biology - Online Test
Q1. In fungi like ascomycetes and basidiomycetes, an intervening dikaryotic stage occur. Such condition is called
Answer : Option C
Explaination / Solution:
In fungi like ascomycetes and basidiomycetes, an intervening dikaryotic stage (n + n i.e. two nuclei per cell) occurs; such a condition is called a dikaryon and the phase is called dikaryo phase of fungus.
Q2. The absorption of water by seeds and drywood takes place by a special type of diffusion called
Answer : Option A
Explaination / Solution:
Imbibition is a special type of diffusion when water is absorbed by solids-colloids causing an enormous increase in volume. Examples include the absorption of water by seeds and dry wood.
Q3. The meiocyte of an onion plant contains 32 chromosomes. Calculate the number of chromosomes found in its endosperm
Answer : Option C
Explaination / Solution:
The meiocyte cell are diploid so, haploid cell will contain 16 chromosomes. The endosperm cell are formed by fusion of two polar nuclei and one male gametes so, endosperm cells are triploid that will contain 16x3= 48 chromosomes.
Q4. Species facing competition might evolve mechanism that promotes co-existence rather than exclusion and that mechanism can be
Answer : Option B
Explaination / Solution:
Species facing completion might evolve mechanism that promotes co-existence rather than exclusion that mechanism is called resource partitioning. In which they avoid completion by choosing different times of feeding or different foraging patterns
Q5. They are compound or mixture of chemicals which are added to the soil in order to overcome deficiency of minerals
Answer : Option C
Explaination / Solution:
Fertilizers are compound or mixture of chemicals which are added to the soil in order to overcome deficiency of minerals. Fertilizers are added to restore the nutrient deficiency.
Q6. Which of the following is not a part of human alimentary canal?
Answer : Option B
Explaination / Solution:
The Ilium is the uppermost and largest bone of the pelvis in vertebrates. Duodenum jejunum and colon are parts of human alimentary canal but ileum is not a part of this system.
Q7. The virus that causes AIDS is
Answer : Option B
Explaination / Solution:
Lymphadenopathy-associated virus (LAV) A former name for HIV is the virus that causes AIDS. It is membrane of lymph nodes. Lymph node get affected and destroy the defense mechanism of human body.
Q8. The correctly matched pair is :
Answer : Option A
Explaination / Solution:
Cats have binocular vision that is cat can use two eyes together. This kinds of vision helps in depth measurement and analysis of the image formed on retian.
Q9. Which one is a peat moss?
Answer : Option D
Explaination / Solution:
Sphagnum is also known as peat moss as it provide peat that have long been used as fuel.
Q10. Mitochondria is called “Power house of the cell” because
Answer : Option B
Explaination / Solution:
Mitochondria is called as power house of the cell because it contain enzyme for cellular respiration in which energy is released in form of ATP.
