Biology - Online Test
Q1. Embryology is
Answer : Option B
Explaination / Solution:
Embryology is the branch of biological science in which we study about spore, fertilisation as well as formation of embryo. It is not just the formation of embryo from zygote.
Q2. The term Darwinian fitness among populations living together signifies
Answer : Option A
Explaination / Solution:
The term Darwinian fitness among populations living together signifies the reproductive fitness of organisms population. Those species that can reproduce in between are called reproductive fitness.
Q3. Function of laghaemoglobin during biological nitrogen fixation in root nodules of legumes is to
Answer : Option A
Explaination / Solution:
During biological nitrogen fixation in root nodules of legumes, laghaemoglobin provide protection to the nitrogenase from Oxygen.
Q4. Correct sequence of layers in gut wall from inside to outside is :
Answer : Option B
Explaination / Solution:
Serosa is the outermost layer while mucosa is the innermost layer. The layer next to mucosa is the sub-mucosa containing nerves, blood and lymph vessels. Muscularisis found between sub-mucosa and serosa.
Q5. A metastatic cancerous tissue is termed ‘sarcoma’ if the disorder is in
Answer : Option B
Explaination / Solution:
A metastatic cancerous tissue is called sarcoma if the disorder is in fibroblast. The property of cancerous cells to reach from one part of the body to other through blood is called metastasis.
Q6.
Among photoreceptors cones are responsible for bright light vision and they also :
i. give colour vision because they contain 3 different pigments.
ii. pigments are sensitive to red,green and yellow lights.
iii. pigments are sensitive to red,green and blue lights.
iv. individual cone cell contains all the three pigments in it.
Answer : Option D
Explaination / Solution:
In the human eye, there are three types of cones which possess their own characteristic photopigments that respond to red, green and blue lights. The sensations of different coloursare produced by various combinations of these cones and their photopigments.
Q7. Archegoniophore occurs in
Answer : Option C
Explaination / Solution:
Archegoniophore (female gametophytes ) develop on the thallus of Marchantia. Each archegonium produces a single egg cell which helps in sexual reproduction.
Q8. The vacuoles are bound by the single membrane is called as
Answer : Option A
Explaination / Solution:
The vacuole is bound by a single membrane called tonoplast. In plant cells the vacuoles can occupy up to 90 per cent of the volume of the cell. In plants, the tonoplast facilitates the transport of a number of ions.
Q9. Okazaki is known for his contribution to the understanding of
Answer : Option C
Explaination / Solution:
Reiji Okazaki (October 8, 1930 – August 1, 1975) was a pioneer Japanese molecular biologist, known for his research on DNA replication and especially for describing the role of Okazaki fragments along with his wife Tsuneko.
He proposed the concept of semi-conservative nature of replication of DNA molecules.
Q10. The splitting of water molecules is associated with
Answer : Option B
Explaination / Solution:
This is achieved by electrons available due to splitting of water. The splitting of water is associated with the PS II; water is split into H+, [O] and electrons.
