biology-today_2015-03
Given below is the diagrammatic sketch of a certain type of connective tissue. Identify the parts labelled a, B, c and D, and s ...
an anther has 1200 pollen grains. how many Pmcs must have been there to produce them? (a) 1200 (b) 300 (c) 150 (d) 2400 In onio ...
choose the right sequential phenomena among the following during the delivery of O 2 from blood to tissue. P : absorption of cO ...
(c) is a microspore that has not yet divided by mitosis (d) still consists of microsporocyte. Which of the following is wrongly ...
how many secondary spermatocytes will be required to form 400 spermatozoa? (a) 40 (b) 100 (c) 200 (d) 400 The ‘cells of rauber’ ...
(b) a: pollutant B: aerobic process c: anaerobic process (c) a: oxygen concentration B: cO 2 concentration c: temperature (d) a: ...
Which one of the following refers to allen’s rule? (a) an organism can move from a stressful habitat to a more hospitable area ...
an inter-breeding population of finches became separated geographically, forming two isolated groups. Each group then became su ...
What proportion of the offsprings obtained from cross aaBBcc × aaBbcc will be completely heterozygous for all the genes segrega ...
how many secondary spermatocytes will be required to form 400 spermatozoa? (a) 40 (b) 100 (c) 200 (d) 400 The ‘cells of rauber’ ...
(b) a: pollutant B: aerobic process c: anaerobic process (c) a: oxygen concentration B: cO 2 concentration c: temperature (d) a: ...
Which one of the following refers to allen’s rule? (a) an organism can move from a stressful habitat to a more hospitable area ...
an inter-breeding population of finches became separated geographically, forming two isolated groups. Each group then became su ...
What proportion of the offsprings obtained from cross aaBBcc × aaBbcc will be completely heterozygous for all the genes segrega ...
SECTION - A How is the entry of only one sperm, and not many, ensured into an ovum, during fertilization in humans? Name one au ...
Study the flow chart given below. Name the hormones involved at each stage and explain their functions. In a large population, ...
(i) Describe the characteristics of a cloning vector. (ii) How is a bacterial cell made ‘competent’ to take up recombinant DNA ...
Crop Variety Insect pests (i) Flat bean Pusa sem 2 Jassids, aphids and fruit borer (ii) Okra (Lady’s finger) Pusa Sawani Shoot ...
\q== 0 .. 0001 001 Now, p + q = 1 \ p = 0.99 So, the frequency of carriers of albinism in the population i.e., 2pq, is 2 pq = 2 ...
(i) The infective stage of Plasmodium which Anopheles mosquito takes in, along with the blood meal, from an infected human is g ...
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