CBSE 12TH BIOLOGY - Online Test
Q1. Evidences of evolutionary relationship are found in ______.
Answer : Option C
Explaination / Solution:
Evidence of evolutionary relationship are found in fossils in different way. Some fossils act as connecting link between two species. Fossils are found at different depth in earth crust that give evidence of existence of different period of time.
Q2. Insulin is used to treat
Answer : Option D
Explaination / Solution:
Insulin is a hormone released by pancreas that control sugar level in blood. Diabetic patients take insulin in form of injection to control blood sugar level.
Q3. Expended form of WHO is
Answer : Option D
Explaination / Solution:
WHO stands for world health organization.This organization take care of spread of different disease world over.
Q4. Stage of a bacterial growth just after inoculation will be:
Answer : Option B
Explaination / Solution:
Leg phase of growth is initial stage of growth during which growth takes place slowly. Bacterial growth just after addition into nutrient medium occurs slowly. So, it is in leg phase of growth.
Q5. Skin in our body is an example of
Answer : Option B
Explaination / Solution:
Innate immunity is specific type of defense that is present at the time of birth. They provide different types of barrier to the entry of foreign elements. Skin in our body is main barrier which prevent entry of microbes in our body.
Q6. Which statement is not correct about the DNA?
Answer : Option B
Explaination / Solution:
DNA content is halved during meiosis cell division and not during mitosis cell division. Chromosome is made of DNA protein and same amount of DNA is present in all cells of an individual.
Q7. Correct sequence for decomposition process is:
Answer : Option B
Explaination / Solution:
Decomposition process involves fragmentation, leaching, catabolism and mineralization in sequence. Decomposition is essential form nutrient cycles in the ecosystem.
Q8. Cutting of anthers from the bisexual flowers of female parents is called
Answer : Option B
Explaination / Solution:
Emasculation is the technique of removing anther from bisexual flower to prevent self-pollination. The stigma is further covered with butter paper to prevent air born pollination.
Q9. Match the following:
national park
a) Shiv Puri National Park
b) Hazaribagh National Park
c) Simlipal National Park
d) Nokrek National Park
state
i) Meghalaya
ii) Orissa
iii) Jharkhand
iv) Madhya Pradesh
national park
a) Shiv Puri National Park
b) Hazaribagh National Park
c) Simlipal National Park
d) Nokrek National Park
state
i) Meghalaya
ii) Orissa
iii) Jharkhand
iv) Madhya Pradesh
Answer : Option B
Explaination / Solution:
Explanation:
- Madhav National Park is situated in Shivpuri District of Gwalior region in northwest Madhya Pradesh, India. It was named after Madho Rao Scindia, the Maharaja of Gwalior belonging to the Scindia dynasty of the Marathas.
- Hazaribagh National Park, located 19 km from Hazaribagh, Jharkhand, India and about 135 km from Ranchi is a national park and also a wildlife sanctuary. The park has tigers, panthers, sambhars, spotted deer, bisons and a number of mammalian faunas.
- Simlipal National Park is a national park and a tiger reserve in the Mayurbhanj district in the Indian state of Odisha.
- Nokrek National Park, or Nokrek Biosphere Reserve, is a national park located approximately 2 km from Tura Peak in West Garo Hills district of Meghalaya, India. UNESCO added this National park to its list of Biosphere Reserves in May 2009.
Q10. The phenomenon involved in formation of female gametophyte is known as
Answer : Option D
Explaination / Solution:
The process of formation of female gametophyte inside the ovary by meiotic and mitotic division is called megasporogenesis.
