Biology - Online Test
Q1. Cancer cells are damaged by radiations while others are not because cancer cells are
Answer : Option B
Explaination / Solution:
Cancer cells are killed by radiation to treat cancer. Cancer cells are undergoing rapid division and radiation killed these cells but normal cells are not affected by these radiation therapy.
Q2. In the diagram below, 1 and 2 are
Answer : Option D
Explaination / Solution:
The outer ear consists of the pinna and external auditory meatus or canal. An Eustachian tube connects the middle ear cavity with the pharynx.
Q3. Peristome of Moss takes part in
Answer : Option B
Explaination / Solution:
All moss capsules have an operculum and peristome. During spore dispersal , peristome teeth bend outwards and spores fall out of the capsule and are carried by air currents.
Q4. Nucleoplasm otherwise called as
Answer : Option A
Explaination / Solution:
The nuclear matrix or the nucleoplasm contains nucleolus and chromatin. The nucleoli are spherical structures present in the nucleoplasm.
Q5. All the terminator codons begin with the nucleotide of
Answer : Option A
Explaination / Solution:
Terminator codon do code for any amino acids. UAA, UAG, UGA are three codon that do not code for amino acids. All three terminator or stop codon start with U.
Q6. The single chlorophyll molecule forms a
Answer : Option D
Explaination / Solution:
The single chlorophylla molecule forms the reaction centre. The reaction centre is different in both the photosystems. In PS I the reaction centre is chlorophyll a.
Q7.
Water breathing is more problematic than air breathing because :
i. water is 800 times more dense and hence holds much more oxygen than air does.
ii. since oxygen dissolved in water diffuses far more slowly than air therefore large quantity of water is required to be passed over the gills.
Answer : Option A
Explaination / Solution:
Water breathing is more problematic than air breathing because oxygen dissolved in water diffuses far more slowly than air therefore large quantity of water is required to be passed over the gills.
Q8. Breeding crops with higher levels of vitamins and minerals or higher protein and healthier fats is called
Answer : Option D
Explaination / Solution:
Bio-fortification is the breeding of crops with higher levels of vitamins and minerals to improve public health. Nutritional quantity is increased for protein, vitamins and minerals.
Q9. Select the group which represents only critically endangered species (as per 2008 red list):
Answer : Option B
Explaination / Solution:
According to red data book 2008, Critically endangered is the highest conservation status animals. The Amur Leopard who has just over 60 individuals left in its population. The Cross River Gorillas are a population between 200 and 300 individuals. Hawksbill Turtle, Leatherback Turtle have all unknown population numbers.
Q10. Oral contraceptive pills contain estrogen and progesterone, that prevent
Answer : Option B
Explaination / Solution:
Oral contraceptive pill contain estrogen and progesterone that prevents the release of secondary oocyte from ovary. The secondary oocyte develops to female egg or ovum. Use of these pills prevents the ovum formation.
