Biology - Online Test
Q1. The first step of recombinant DNA technology involves
Answer : Option D
Explaination / Solution:
The first step of recombinant DNA technology involves isolation of genetic material. This is performed by using enzymes that hydrolyzes the outer covering of cell as cellulase, chitinases pectinase etc.
Q2. During urine formation, the tubular cells secrete ------------------ into the filtrate.
Answer : Option D
Explaination / Solution:
The substances that are secreted into the tubular fluid (for removal from the body) include:
- Potassium ions (K+),
- Hydrogenions (H+),
- Ammonium ions (NH4+),
- creatinine,
- urea,
- some hormones,
- and some drugs (e.g. penicillin).
Q3. Which of the following is an example of divergent evolution?
Answer : Option A
Explaination / Solution:
In divergent evolution, same structure developed along different directions due to adaptation to different needs. Homologous organs are those organs that have common origin but performing different functions.
Q4. Which one function as “Biological check post”
Answer : Option B
Explaination / Solution:
Endodermis forms the outermost layer of vascular bundles. Anything entering inside the plant body must cross theendodermis to be transported via xylem and phloem. So, endodermis is called as biological check post of the cell.
Q5. Exponential growth is dependent on
Answer : Option B
Explaination / Solution:
Exponential growth is dependent on initial size, rate of growth and time interval.
Q6. Animals that has become extinct in India is
Answer : Option B
Explaination / Solution:
The animals that were present earlier but now not available are called extinct animals. In India a number of animals have become extinctsuch as Cheetah.
Q7. Non-motile spores produced exogenously by constriction at the tips of special hyphae are called as
Answer : Option C
Explaination / Solution:
The plant body of fungi is called mycelium. A small portion of mycelium is called hyphae. Asexual reproduction in fungi occurs by development of constriction at the tips of hyphae called conidiophores.
Q8. Humus will never be
Answer : Option B
Explaination / Solution:
Humification leads to accumulation of dark coloured amorphous substance called humus that is highly resistance to microbial action and decompose at very slow rate.
Q9.
Match the following :
vertebra
a) Cervical
b) Coccyx
c) Thoracic
d) Lumbar
No.of bones feature
i) 5
ii) 4
iii)12
iv) 7
Answer : Option A
Explaination / Solution:
Vertebral column in general. The vertebral column usually consists of 33 vertebrae: 24 presacral vertebrae (7 cervical, 12 thoracic, and 5 lumbar) followed by the sacrum (5 fused sacral vertebrae) and the coccyx (4 frequently fused coccygeal vertebrae).
Q10. The animals that have had their DNA manipulated to possess and express an extra gene are known as
Answer : Option D
Explaination / Solution:
Transgenic animals are animals (most commonly mice) that have had a foreign gene deliberately inserted into their genome. Such animals are most commonly created by the micro-injection of DNA into the pronuclei of a fertilised egg which is subsequently implanted into the oviduct of a pseudopregnant surrogate mother. Transgenic cow, rat, rabbits and fish have been produced.
