Reproduction

Q.

Differentiate between the following.

True and false fruits

Q.

Question 9
How are the modes of reproduction different in unicellular and multicellular organisms?

Q.

What are the two types of reproduction?

Q.

Define asexual reproduction.

Q. Observe the diagram of menstrual cycle and answer the following questions:
(1) What is the period of menstruation?
(2) On which day does ovulation occur during menstrual cycle?
(3) During which period is corpus luteum active during menstrual cycle? Which hormones are secreted by corpus luteum ?
(4) In menstrual cycle which reproductive organs undergo changes?
(5) Which period is said to be period of regeneration of endometrium?
(6) Which period is said to be period of secretions of glands in the endometrium?

Q. Which factor is responsible for different mode of reproduction found in organisms?

Q.

Do all living things reproduce sexually?

Q.

Question 17

Why is reproduction important for organisms?

Q.

Will seeds grow without soil?

Q. How does reproduction help in providing stability to the species?

Q.

Why do organisms reproduce?

After all, reproduction is not necessary to maintain the of the individual organisms, unlike the essential life of an individual respiration, or excretion.on the other hand, if individual organism is going to create more individuals , a lot of its energy will be spent in the process.

So why should an individual organism waste energy on a process it does not need to stay alive?

Q.

Why does meiosis occur during the formation of gametes?

1. It allows the number of gametes to be doubled.

2. It prevents asexual reproduction in the life cycle.

3. It prevents variations appearing in the phenotype.

4. It produces haploid gametes in preparation for fertilization.

Q.

What are androphore and gynophore?

Q.

The basic event in the reproduction process in a living organism which is a primary requisite is ______.

1. Protein synthesis

2. Release of hormones

3. Puberty

4. DNA Replication

Q.

How is the number of chromosomes restored in each generation

Q.

Reproduction is linked to the stability of the population of a species. Justify with the statement.

Q.

DNA copies generated during reproduction will be similar but may not be identical. Justify the statement.

Q.

Give the full form of DNA.

Q. Do all organisms give birth to individuals like humans ?

Q. What are the basic events of reproduction

Q.

Can snails pollinate the flowers? What do you call such pollination?

Q.

What is the structural unit of DNA?

Q.

How do insects help in pollination?

Q. The process of doubling and duplicating the genetic material in the human cells is known as ________ and ________ type of cell division reduces chromosome number to half in sex cells.

1. DNA duplication, meiotic
2. DNA amplification, mitotic
3. DNA multiplication, cytokinesis
4. DNA replication, meiotic

Q.

Seeds of drumstick and maple are carried long distances by wind because they possess?

1. winged seeds

2. large and hairy seeds

3. long and ridged fruits

4. spiny seed

Q. Which of the following statement is correct about sexual reproduction?

1. Sexual reproduction takes place only in plants
2. Meiosis produces gametes for sexual reproduction
3. Only multicellular organisms undergo sexual reproduction
4. Sexual reproduction takes place in all the organisms

Q.

What is reproduction?

Q.

Reproduction is important as it allows _______.

Q.

Why do organisms reproduce at the expense of energy even though reproduction is not as vital as respiration, excretion etc.?

1. To make organisms more vulnerable to natural changes.

2. To generate more energy and efficiency in the life processes.

3. It’s a basic instinct which cannot be avoided.

4. To continue their species.

Q. State true or false.
Reproduction is essential for the survival of both - a human being and a bacterium.

1. True
2. False