Chapter 6: Molecular Basis of Inheritance
1. Group the following as nitrogenous bases and nucleosides: Adenine, Cytidine, Thymine, Guanosine, Uracil and Cytosine.Ans: Nitrogenous Bases – Adenine, Uracil and Cytosine, Thymine; Nucleosides – Cytidine, guanosine. 2. If a double stranded DNA has 20 per cent…
Chapter 5: Principles of Inheritance and Variation
1.Mention the advantages of selecting pea plant for experiment by MendelAns: Mendel select garden pea (Pisum Sativum) for the following reasons.(i) It is an annual plant with short life span and gives results within 3 months.(ii) The plant…
Chapter 4: Reproductive Health
1. What do you think is the significance of reproductive health in a society?Ans: Reproductive health in a society is significant because the people are aware of(i) birth control methods and advantages of small family,(ii) sexually transmitted diseases…
Chapter 3: Biology Human Reproduction
1. Fill in the blanks:(a)Humans reproduce————— (asexually/sexually).(b)Humans are————— (oviparous, viviparous,ovoviviparous).(c)Fertilization is————— in humans (external/internal).(d)Male and female gametes are—————(diploid/haploid).(e)Zygote is————— (diploid/haploid).(f)The process of release of ovum from a mature follicle is called————— .(g)Ovulation is induced by a hormone…
Chapter 2: Sexual Reproduction in Flowering Plants
1. Name the parts of anangiosperm flower in which development of male and female gametophytes take place.Ans: Development of male gametophyte (micro- gametogenesis) occurs in pollen sac of anther up to 2 – celled stage. The female gametophyte…
Chapter 1: Reproduction in Organisms
1. Why is reproduction essential for organisms?Ans: Reproduction is the ability of living organisms to produce a young one similar to itself. It ensures continuity of a species generation after generation. Reproduction introduces variation in the organisms. Useful variations…
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