Question

D. Answer the following questions in brief.
Distinguish between asexual and sexual reproduction.
How is reproduction carried out in Hydra?
How is fertilisation in a hen different from fertilisation in a frog?
4.
State the difference between oviparous and viviparous animals.
Why is the number of eggs, laid by frogs at a time, much higher than those laid
3.
5.
by a hen?
6.
7.
How will you differentiate between a zygote and an embryo?
It is the mother who gives birth to a child. How do children, then, get features
of both the parents?​

Answer 1

Answer:

1) Asexual reproduction involves one parent and produces offspring that are genetically identical to each other and to the parent. ... During sexual reproduction, two haploid gametes join in the process of fertilization to produce a diploid zygote. Meiosis is the type of cell division that produces gametes.

2 ) Organisms such as hydra use regenerative cells for reproduction in the process of budding. In hydra, a bud develops as an outgrowth due to repeated cell division at one specific site. These buds develop into tiny individuals and, when fully mature, detach from the parent body and become new independent individuals.

3) Both the animals produce eggs but the main difference lies, where they fertilisation occurs, the fertilisation of eggs is in the water i.e. outside their body whereas the fertilisation of hen's egg is occurs inside the body that is hens egg has a hard shell whereas the egg of a frog is like soft jelly.

4) The main difference between oviparous and viviparous animals is that oviparous animals do not undergo any embryonic development inside the mother whereas viviparous animals develop into a young animal inside the mother. ... In contrast, viviparous animals are born as live young individuals. Therefore, they do not lay eggs.

5 ) by hen. Dear student, Organisms having internal fertilization, like a hen, produce one egg at a time. This is so because here there is less chance of failure fertilization.

6 .)An embryo is the early stage of human development in which organs are critical body structures are formed. An embryo is termed a fetus beginning in the 11th week of pregnancy, which is the 9th week of development after fertilization of the egg. A zygote is a single-celled organism resulting from a fertilized egg.

7 .)A baby has characters of both parents as the genes from both parents are transferred to the child. This happens because of DNA. From the 22 pairs of chromosomes half are transferred from mother and half from father . These characteristics or traits are called inherited traits because they came from our parents.

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Answer 2

Answer:

and 1,2,are in pictures.,........

4.

Animals show different methods of production of young ones. Oviparous and viviparous are such two methods. The main difference between oviparous and viviparous animals is that oviparous animals do not undergo any embryonic development inside the mother whereas viviparous animals develop into a young animal inside the mother. This means oviparous animals lay eggs. These eggs develop and hatch into young individuals. In contrast, viviparous animals are born as live young individuals. Therefore, they do not lay eggs. Birds, reptiles, amphibians, most fish, insects, mollusks, arachnids, and monotremes are oviparous animals. Most mammals are viviparous animals.

5.

Actually it's the way to survive in this world ('survival of the fittest') one organism follows. The main two factors in the replication of any organism are Quality and Quantity. In this case frog chose quantity and the hen chose quality.

Actually it's the way to survive in this world ('survival of the fittest') one organism follows. The main two factors in the replication of any organism are Quality and Quantity. In this case frog chose quantity and the hen chose quality.Higher organisms always follow the trend to choose quality over quantity. Compared to other classes Mammals have always lesser number of offspring while the insects have the most.

Actually it's the way to survive in this world ('survival of the fittest') one organism follows. The main two factors in the replication of any organism are Quality and Quantity. In this case frog chose quantity and the hen chose quality.Higher organisms always follow the trend to choose quality over quantity. Compared to other classes Mammals have always lesser number of offspring while the insects have the most.In this case as frogs have external fertilization, it's the wiser way to choose number of eggs over quality of it. Adverse environmental factors, interruption by predators during mating etc factors always play important roles in replication of this organisms. But in case of hen the chances of being affected by this superficial factors are much less, thus they chose quality over quantity.

Actually it's the way to survive in this world ('survival of the fittest') one organism follows. The main two factors in the replication of any organism are Quality and Quantity. In this case frog chose quantity and the hen chose quality.Higher organisms always follow the trend to choose quality over quantity. Compared to other classes Mammals have always lesser number of offspring while the insects have the most.In this case as frogs have external fertilization, it's the wiser way to choose number of eggs over quality of it. Adverse environmental factors, interruption by predators during mating etc factors always play important roles in replication of this organisms. But in case of hen the chances of being affected by this superficial factors are much less, thus they chose quality over quantity.Now if you consider human and hens, humans generally give birth to 1 or 2 babies( it can vary upto maximum 10) in their whole lifetime but a hen gives lot more eggs than that in its lifetime.

6.

Zygote Embryo

Zygote EmbryoThe term zygote is from Greek word “zygotos” which means to “join” The term embryo is from Latin work “embryum” which means “that which grows”

Zygote EmbryoThe term zygote is from Greek word “zygotos” which means to “join” The term embryo is from Latin work “embryum” which means “that which grows”Zygote is unicellular Embryo is multicellular

Zygote EmbryoThe term zygote is from Greek word “zygotos” which means to “join” The term embryo is from Latin work “embryum” which means “that which grows”Zygote is unicellular Embryo is multicellularThe process of formation of zygote is known as fertilization The process of formation of embryo is known as embryogenesis

Zygote EmbryoThe term zygote is from Greek word “zygotos” which means to “join” The term embryo is from Latin work “embryum” which means “that which grows”Zygote is unicellular Embryo is multicellularThe process of formation of zygote is known as fertilization The process of formation of embryo is known as embryogenesisIn medical terms, zygote is known as zygocyte In medical terms, embryo is known as diploid eukaryote

7.

A baby has characters of both parents as the genes from both parents are transferred to the child. This happens because of DNA. From the 22 pairs of chromosomes half are transferred from mother and half from father . These characteristics or traits are called inherited traits because they came from our parents

3.

Both the animals produce eggs but the main difference lies, where they fertilisation occurs, the fertilisation of eggs is in the water i.e. outside their body whereas the fertilisation of hen's egg is occurs inside the body that is hens egg has a hard shell whereas the egg of a frog is like soft jelly.

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