Sexual Reproduction

Q. A certain couple got only four daughters in a row and no son. Does it mean that the husband does not produce Y-bearing sperms? Explain. [3 MARKS]

Q.

Distinguish between a gamete and zygote. Explain their roles in sexual reproduction.

Q.

Describe the process of double fertilization.

Q.

Define reproduction. What are the advantages of sexual reproduction over asexual reproduction?

Q.

Describe the various steps involved in the sexual reproduction in animals. Draw labelled diagrams to show the fertilisation of an ovum (or egg) by a sperm to form a zygote.

Q. What are the advantages and disadvantages of variation in reproduction or during reproduction

Q. Define sexual reproduction.

Q.

State True or False.

Sexual reproduction generates less variation than asexual reproduction.

1. True

2. False

Q. Explain Human reproduction.

Q.

How is the equal genetic contribution of male and female parents ensured in the progeny?

Q.

What is the need for reproduction?

Q. Reproduction is one of the most important characteristics of living beings. Give three reasons in support of the statement.

Q.

Why is sexual reproduction necessary for evolution.

Q. How does human reproduce?

Q.

Which species is likely to have comparatively better chance of survival- the one or one sexual?give reason to justify your answer.

Q.

What is sexual reproduction?

Q.

Mating is the process of

1. production of male gametes

2. production of female gametes

3. pairing of opposite sex

4. pairing of same sex

Q.

What is anisogamous reproduction?

Q. Explain how, offsprings and parents of organisms reproducing sexually have the same number of chromosomes.

Q.

In humans, non-motile and food storing germ cell is ________ and the motile germ cell is _________.

1. Ovule, anther

2. Ovum, sperm

3. Sperm, ovum

4. Ovule, sperm

Q. Two different types of gametes produced by different sexes of the same species are called .

1. homogametes
2. hetrogametes
3. isogametes

Q.

Question 50
Write two points of difference between asexual and sexual types of reproduction. Describe why variations are observed in the offspring formed by sexual reproduction.?

Q. The chromosome number of the sexually reproductive parent and their offspring is the same. Justify the statement

Q. Advantages of sexual reproduction over asexual reproduction?

Q.

Why does asexual reproduction show very little variation?

Q. How many parents are involved in sexual reproduction?

1. 4
2. 1
3. 0
4. 2

Q.

What are the advantages of asexual reproduction?

Q.

How many chromosomes do you inherit from your mother?

Q.

The ratio of the number of chromosomes in a human zygote and a human sperm is :
(a) 2: 1
(b) 3: 1
(c) 1: 2
(d) 1: 3

Q.

Question 48
What would be the ratio of chromosome number between an egg and its zygote? How is the sperm genetically different from the egg??