Biology - Online Test
Q1. Which of the following examples of variation is not important from an evolutionary standpoint?
Answer : Option D
Explaination / Solution:
Biological evolution refers to the cumulative changes that occur in a population over time. Non-genetic changes that occur during an organism's life span, such as increases in muscle mass due to exercise and diet,differences due to health, age or accident that have no affect on an individual's ability to survive and reproduce cannot be passed on to the next generation and are not examples of evolution.
Q2. Which one is less general in characteristic as compared to genus
Answer : Option A
Explaination / Solution:
Division is the highest category of hierarchy which contain organisms having only a few common characters. On the other hand, species belongs to lowest level so, the organisms have more common characters.
Q3. In angiosperms, main water and mineral transporting elements is
Answer : Option C
Explaination / Solution:
In angiosperms, the main water and mineral transporting element is tracheids. Vessels also transport water and mineral in angiosperms.
Q4. Antiauxin used in picking cotton bolls is
Answer : Option C
Explaination / Solution:
TIBA (2,3,5 Triidobenzoic acid) acts as antiauxin that inhibit root and shoot formation. TIBA is used as antiauxin in picking cotton bolls.
Q5. The first order consumers are called:
Answer : Option B
Explaination / Solution:
Plants and algae make their own food and are called primary producers. Herbivores eat plants and are called primary consumers.
Q6. The form of thalamus in which ovary is at top and stamens, petals and sepals are borne below is called
Answer : Option A
Explaination / Solution:
In the hypogynousflower, thegynoecium occupies the highest position while the other parts are situatedbelow it. The ovary in such flowers is said to be superior.
Q7. DNA is denatured to produce single strand by
Answer : Option C
Explaination / Solution:
Deoxyribose nucleic acid is denatured to produce single stranded by using alkaline solution. DNA is acidic in nature, in alkaline solution the hydrogen bonds between the nitrogenous bases is broken to separate two strands.
Q8. Human population growth is
Answer : Option A
Explaination / Solution:
Human population growth is exponential growth which gets doubled every time. The newly produced individual also participates in population increase after attaining puberty.
Q9. How many times do nymphs moult to reach the adult form of cockroach?
Answer : Option D
Explaination / Solution:
When the ootheca hatches, tiny nymph come out. It grows by undergoing moulting about 13 times to reach the adult form.
Q10. Which possess acellular structure?
Answer : Option A
Explaination / Solution:
A bacteriophage is a virus that infects and replicates within a bacterium.
Except bacteriophage, all possess cellular structure.
