Biology - Online Test
Q1. Thallus of Riccia is
Answer : Option D
Explaination / Solution:
Riccia is a genus of liverworts in the order Marchantiales. In bryophytes, plant body is generally haploid (n) that alternate with diploid form for shorter period. The thallus of Riccia is Halploid.
Q2. Lysosomes are rich in hydrolytic enzymes such as
Answer : Option A
Explaination / Solution:
Lysosomes are found to be very rich in almost all types of hydrolytic enzymes (hydrolases – lipases, proteases, carbohydrases) optimally active at the acidic pH. These enzymes are capable of digesting carbohydrates, proteins, lipids and nucleic acids.
Q3. Whose experiments cracked the DNA and discovered unequivocally that a genetic code is a ‘‘triplet’’?
Answer : Option D
Explaination / Solution:
The Nirenberg and Matthaei experiment was a scientific experiment performed on May 15, 1961, by Marshall W. Nirenberg and his post doctoral fellow, J. Heinrich Matthaei. The experiment deciphered the first of the 64 triplet codons in the genetic code by using nucleic acid homopolymers to translate specific amino acids and discovered that genetic code is triplet
Q4. Which wavelength is inactive in PS I
Answer : Option B
Explaination / Solution:
Photosystem are light reactive centre to capture solar energy. Photosystem I is active below the wavelength of light below 780 nm. While photsystem II is active above 780 nm.
Q5. Read the following about blood pigments :
i. Hemoglobin is the pigment present in our blood and is iron containing protein.
ii. Haemocyanin is the pigment present in blood of Palaemon and is copper containing protein.
iii. Haemocyanin is much more efficient than haemoglobin.
i. Hemoglobin is the pigment present in our blood and is iron containing protein.
ii. Haemocyanin is the pigment present in blood of Palaemon and is copper containing protein.
iii. Haemocyanin is much more efficient than haemoglobin.
Answer : Option A
Explaination / Solution:
Haemoglobin is the pigment present in our blood and is iron containing protein. Haemocyanin is the pigment present in blood of Palaemon and is copper containing protein.
Q6. The process of growing whole plants from explant is called
Answer : Option A
Explaination / Solution:
The process of growing whole plants form any part of plant (explant) is called tissue culture. In this process part of plant is grown in test tube under sterile condition in special nutrient.
Q7. Which of the following is a vulnerable species (as per 2008 red list):
Answer : Option B
Explaination / Solution:
The IUCN Red List of Threatened Species (also known as the IUCN Red List or Red Data List), founded in 1964, is the world's most comprehensive inventory of the global conservation status of biological species.
Vulnerable species are likely to become endangered unless something changes. Polar bear is likely to become endangered due to climate change. So, polar bear is vulnerable species as per 2008 red book list.
Q8. To exert their effect on the target cell, water soluble hormones will need to bind with
Answer : Option C
Explaination / Solution:
Hormones are released in trace amount from endocrine glands and to exert their effect on the target cell, water soluble hormones will need to bind with cell membrane bound receptors.
Q9. Choose the odd one out: Round worm, Hook worm, Filaria worm, Earthworm
Answer : Option B
Explaination / Solution:
Earthworm belongs to phylum Annelida where as all other worms belong to phylum Aschelminthes.
Q10. Each testicular lobules contain one to three highly coiled
Answer : Option C
Explaination / Solution:
Testicular tubules are present inside the testis. Each testicular lobule contains one to three highly coiled seminiferous tubules. Seminiferous tubules contain two types of cells male germ cells and sertoli cells.
