Biology - Online Test
Q1. Epiblast present in certain monocot embryo represents
Answer : Option A
Explaination / Solution:
Embryo of certain monocotyledonous seeds contain additional cotyledon besides one present in al monocots. This cotyledon represents the evolutionary stage of cotyledon formation from one to two.
Q2. Migration is an adaptation that should be categorised under
Answer : Option A
Explaination / Solution:
The organisms move away temporally from stressful habitat to more suitable habitat is called migration. Migration adaptation is a behavioral attribute.
Q3. The autotrophs that do not use solar energy for synthesis of food are called
Answer : Option A
Explaination / Solution:
The autotrophs are those organism that prepare their own food by using solar or chemical energy. The autotrophs that do not use solar energy for synthesis of food are called chemoautotrophs.
Q4. The correct sequence of lipid digestion in alimentary canal is :
Answer : Option A
Explaination / Solution:
Digestion of (lipid) fat begins in small intestine by secretion of bile juice that contains bile salts. Bile salt emulsify the lipids into globules that is further simplified into micelles and chylomicrons.
Q5. Cancer cells can be easily be destroyed by radiations due to
Answer : Option A
Explaination / Solution:
Radiation therapy targets the DNA inside the cell by making them unable to divide and reproduce. Cancer cells perform unlimited cell division. Now, when their dividing ability is targeted, naturally they respond more. Newly formed cells can be easily destroyed by radiation of high frequency. They stop dividing. Thus, the tumour shrinks.
However, the adjoining normal cells also get affected by radiation but they can repair themselves more effectively.
Q6. In the prosencephalon, first and second ventricles open into third ventricle by :
Answer : Option B
Explaination / Solution:
In prosencephlon, the first and second ventricles open into third ventricles by foramen of Monro. It is the opening that connects the left and right sides of lateral ventricle in brain.
Q7. Both Pteridophytes and Gymnosperms possesses
Answer : Option C
Explaination / Solution:
Pteridophytes and Gymnosperms belongs to different division of plant kingdom but both of them possess Archegonia as female sex organ which produces female gamete for sexual reproduction.
Q8. The inner membrane of mitochondria thrown into folds to form finger like structure is called
Answer : Option B
Explaination / Solution:
Mitochondria are double membranous structure. The inner membrane of mitochondria thrown into folds to form finger-like structureis called cristae.
Q9. Which one of the following is not a part of a transcription unit in DNA?
Answer : Option A
Explaination / Solution:
Transcription is the process by which the information in a strand of DNA is copied into a new molecule of messenger RNA (mRNA).
Transcription of DNA requires a promoter, the structural gene to be transcripted and a terminator. The inducer is not required during transcription of DNA.
Q10. Wavelength of PAR is
Answer : Option D
Explaination / Solution:
The wavelength of light in which photosynthesis light reaction can occurs is called PAR ( photosynthetically active radiation). The wavelength of 400-700 nm is PAR for most of the plants.
