Biology - Online Test
Q1. DNA sequence that code for protein are known as
Answer : Option D
Explaination / Solution:
Exons are coding sections of an RNA transcript, or the DNA encoding it, that are translated into protein. Exons can be separated by intervening sections of DNA that do not code for proteins, known as introns.
Q2. Who proved that oxygen evolved in photosynthesis comes from water?
Answer : Option C
Explaination / Solution:
Ruben, Hassid and Kamen proved that Oxygen evolved during photosynthesis comes from water and not from carbon dioxide. For this, they used water with heavy isotope of oxygen, 18O.
Q3. The “hidden hunger” is due to
Answer : Option D
Explaination / Solution:
If a person get food that do not contain all micronutrient, protein and vitamins in required amount as per age, sex, working condition, this condition is called hidden hunger.
Q4. Conserving biodiversity provides major contribution to economy as :
Answer : Option D
Explaination / Solution:
Ecotourism is a form of tourism involving visiting fragile, pristine, and relatively undisturbed natural areas, intended as a low-impact and often small scale alternative to standard commercial mass tourism.
Conserving biodiversity provides a number of benefits along with contributaion to economy of the country by ecotourism. Large number of foreigner visit to diversity rich countries as tourist.
Q5. Identify the animal given below. Mention its phylum.
Answer : Option D
Explaination / Solution:
The animal is identified as Euspongia which belong to phylum Porifera.
Q6. The release of sperms from Sertoli cells into the cavity of seminiferous tubules is called as
Answer : Option C
Explaination / Solution:
Spermiation is the process of release of sperms from Sertoli cells into the cavity of seminiferous tubules.
Q7. On germination, moss spore produce
Answer : Option A
Explaination / Solution:
The spore of moss germinate to produce protonema. It is a creeping, green, branched and frequently filamentous stage , which develops into secondary protonema as a lateral bud.This stage bears the sex organs.
Q8. Base pairs found in 5 turns of DNA spirals are
Answer : Option C
Explaination / Solution:
Each turn of DNA spirals contains 10 base pairs. So, in five turns of DNA total number of Base pair is 5×10=50 base pairs.
Q9. In human beings, if ovum fertilizes with a sperm carrying X-chromosome the zygote develops into
Answer : Option B
Explaination / Solution:
Male produce two kinds of sperms, half carrying X and half carrying Y sex chromosome besides 22 autosomes. If ovum is fertilized by sperm carrying X chromosome the sex of child developed is female.
Q10. A symbiotic relationship/interaction in which 'one species benefits and the other species is not affected' is called
Answer : Option B
Explaination / Solution:
Commensalism is a relationship between two organisms where one receives a benefit or benefits from the other and the other is not affected by it. In other words, one is benefited and the other is neither benefited nor harmed.
Example:
- Orchids - Some orchids grow on trees and that does not harm the tree.
- Pilot fish - Pilot fish live around sharks, sea turtles and rays and eat the parasites that live on them as well as leftover food they do not eat. Young pilot fish gather around jellyfish and seaweeds.
