(a) Draw a diagrammatic sectional view of a mature anatropous ovule and label the following parts in it:
(i) that develops into seed coat.
(ii) that develops into an embryo after fertilization.
(iii) that develops into an endosperm in an albuminous seed.
(iv) through which the pollen tube grains entry into the embryo sac.
(v) that attaches the ovule to the placenta.
(b) Describe the characteristic features of wind pollinated flowers.Mature anatropous ovule
(b) Characteristics of wind pollinated flowers:
(i) Large number of pollen grains are produced.
(ii) Pollen grains are light and non-sticky.
(iii) Well exposed stamens so that pollen grain are easily dispersed.
(iv) Large and feathery stigma to trap pollen grains.
(a) Why is human ABO blood group gene considered a good example of multiple alleles?
(b) Work out a cross up to F1 generation only, between a mother with blood group A (Homozygous) and the father with blood group B (Homozygous). Explain the pattern of inheritance exhibited.
Describe the structure of a RNA polynucleotide chain having four different types of nucleotides.
Explain mutualism with the help of any two examples. How is it different from commensalism?
(a) Why are the fruit juices bought from market clearer as compared to those made at home?
(b) Name the bioactive molecules produced by Trichoderma polysporum and Monascus purpureus.
Differentiate between inbreeding and outbreeding in cattle. State one advantage and one disadvantage for each one of them.
With the help of any two suitable examples explain the effect of anthropogenic actions on organic evolution.
(a) Why are transgenic animals so called?
(b) Explain the role of transgenic animals in
(i) Vaccine safety
(ii) Biological products with the help of an example each.
