When does the sperm induce changes in the ovum during the process of fertilization?
When a sperm comes in contact with the zona pellucida layer of the female ovum, it induces structural changes in... View Article
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The quadrinucleate cyst stage is an infective stage for humans. Explain.
Entamoeba histolytica is an amoeba which causes amoebiasis in humans. It resides in the human gut and causes diarrhea and... View Article
DNA fragment containing desired gene can be identified by
a) Southern blotting b) PCR technique c) DNA probes d) Plasmid DNA Answer: c) DNA probes Explanation: A DNA probe... View Article
Maximum height of a plant is 30ft and the minimum height is 10ft. If plant height is controlled by 3 pairs of genes then the height of plant with genotype AaBbCc will be
a) 13.2ft b) 23.2ft c) 16.6ft d) 19.9ft Answer: d) 19.9ft Explanation: Number of polygene = 6 Contribution of each... View Article
How many of the following plant parts exhibit haploidization?
i) Gemmae, ii) Cells in capsule of Funaria, iii) Basidiospores, iv) Zoospores of phycomycetes, v) Spores of slime moulds, vi)... View Article
Taxonomy includes phylogeny as the basis of classification of organisms. Explain.
The modern taxonomic classification is based on phylogeny. Taxonomy is the science of classification and phylogeny is the science of... View Article
The vector useful for delivering rDNA into dicot plant cell is
a) Agrobacterium tumefaciens b) Retrovirus c) Bacillus thuringiensis d) Baculovirus Answer: a) Agrobacterium tumefaciens Explanation: Agrobacterium tumefaciens is a plant... View Article
Air bladder provides buoyancy in
a) Torpedo b) Labeo c) Carcharodon d) Trygon Answer: b) Labeo Explanation: Air bladder, also called swim bladder, gas bladder... View Article
Trickling filter is used in which of the following wastewater treatment processes
a) Primary treatment b) Secondary aerobic treatment c) Secondary anaerobic treatment d) Tertiary treatment e) All of the above Answer:... View Article
Rate and depth of respiration shall increase when
a) CO2 concentration increases b) O2 concentration increases c) HCO3 concentration increases d) HCO3 concentration decreases Answer: a) CO2 concentration... View Article
A sequential expression of a set of human genes occurs when a steroid molecule binds to the
a) tRNA b) mRNA c) DNA sequence d) Ribosome Answer: c) DNA sequence Explanation: When a steroid molecule binds to... View Article
Penicillin was extensively used to treat
a) American soldiers in World War I b) American soldiers in World War II c) Both a) and b) d)... View Article
Which of the following is not included in a bark?
a) Secondary xylem b) Secondary phloem c) Periderm d) Both a) and b) Answer: a) Secondary xylem Explanation: Bark is... View Article
If the milk is not pasteurised, will it be fit for drinking? Give a reason.
Pasteurization is the process of heat killing the pathogens and microorganisms present in a beverage or food item. Raw milk... View Article
270/1000 equals
Solution: 270/1000 = 0.27 When we divide a number by 1000, we write the number and mark decimal point after... View Article
A king divides his property among his 3 sons such that the eldest son’s share is double the second son’s share and the share of the second son is triple the third son’s share. If the second son gets Rs.4000 more than the third, find the value of the total property.
(a) Rs.10000 (b) Rs.20000 (c) Rs.5000 (d) Rs.2000 Solution: Let the third son’s share be x. Then second son’s share... View Article
What is the place value of 6 in 57.765?
Solution: Given number is 57.765. Here 6 is at hundredth place. So the place value is 6/100 = 0.06
How much is 77.
Solution: The power of a number represents how many times we should use the number in a multiplication. 77 =... View Article
What is meant by odd number? Give example.
Solution: Odd numbers are not divisible by 2. Example 1, 3, 5, 7 are odd numbers. An odd number is... View Article
The product of two numbers is 6300 and their HCF is 15. How many pairs of such numbers are there?
(a) 2 (b) 6 (c) 10 (d) 3 Solution: Let x and y be the numbers. Product = xy =... View Article
