Explore topic-wise InterviewSolutions in Current Affairs.

The Right option is : (a) hydra

The female frogs (or female fish) lay hundreds of eggs because there are fewer chances of surviving in that environment, so from 100 even if 5-10 survive, their species will survive.

Answer is (C) 2, 3, 5

Animals that lay eggs do not have epidermal hair or external ears.

All animals do not lay eggs.

Cloning is the technique which was used in producing ‘Dolly’ the sheep.

Correct answer is Cold and dry

Correct option is (D) Texas

Correct option is (D) South

Budding is a form of asexual reproduction, where new individuals develop from bulges or outgrowths on the parent body. These bulges are called buds, and hence the process is called budding. Being an asexual form of reproduction, it requires only one parent for the process.

A. Because of easy availability of coal, mineral oil and iron. 

B. Due to speedy and efficient transport system.

Uterus: It ¡s a part of the female reproductive system. This is a strong muscular sac, where the embryo develops into a baby.

D. Hydra 

Hydra is a multicellular organism which reproduce by budding.

Correct option is (B) Eskimos

Wheat and grapes.

Hydra reproduces by budding where an outgrowth arises from the parent and develops into a new individual. Amoeba reproduces by binary fission in which the division of nucleus is followed by division of the cell resulting in two individuals.

The body wall develops swelling. Observe all the remaining slides. 

a) Picture 1, 2 the body surface of hydra has smooth surface. 

Picture 3, a swelling is formed on it’s body surface.

b) Slide 1 and 2 Hydra body is smooth. Slide. 3, a swelling is formed. Swelling increases in size, tentacles are formed which is called bud. 

Slide 4, the bud is cut off and separated from parent Hydra and can live individually.

c) The swelling develops into a bud.

(a) Hydra reproduce by asexual method called budding. 

(b) Amoeba reproduce by binary fission, a asexual method.

1. Fish and frog lay many eggs to increase chance of survival of the offspring and the continuation or their generation. 

2. They do not take care of their young ones making them prone to predators and may even be washed away by the water force.

3. Thus the more eggs produced, the greater the chances that some will grow to maturation. 

4. Female frog and fish release their eggs in the water and male animals release their sperms in the water. As fertilization takes place in the water it is external ferlitization. There is no safety for the fertilized eggs in the water so these animals lay more number of eggs. 

5. Whereas cow and human beings usually give birth to only one at a time and the internal fertilization takes place in these animals. There is safety for the embryo (the offspring) in the mother’s womb until it’s birth.

Answer is (D) Hydra

Correct option is (A) Colorado

(C) i – c, ii – a, iii – b

Correct option is (B) USA

Budding: Hydra, a microscopic organism reproduces asexually. Buds are formed on the body surface. These buds separated from the hydra and develop into a new individual. This type of asexual reproduction is called Budding.

Oak, birch, ash and beech.

Pampas and Savanna grasslands in Brazil and Argentina.

Amazon forest for its vegetation and wild life.

C. Amoeba 

Amoeba, a unicellular organism reproduce by binary fission.

All the cell types have 23 pairs of chromosomes or 46 total. 

During Meiosis, a cell undergoes two rounds of cell division during which the chromosome pairs are separated and the resulting gametes each have only one copy from each set of chromosomes.

The male gamete in animals is sperm and the female gamete is ovum (egg).

Steps involved in sexual reproduction are :

(i) Formation of gametes through meiosis.

(ii) Transfer of male gametes into the female body.

(iii) Fusion of male and female gametes' Process is fertilisation.

(iv) Formation of offspring from a single-celled zygote fusion Post fertilization changes.

Advantages of sexual reproduction :

(i) It is a source of genetic variations among individuals of a population.

(ii) It gives rise to individuals that are most adapted to the environment.

Comparison:

Asexual Reproduction takes place in Hydra and Amoeba.

The answer is (a) gametes, zygote, embryo, seedling

• Gametes fuse to form a zygote during fertilization. 
• After fertilization embryo will be formed which will lead to seedling in plants.

Reproduction without the fusion of gametes is called Asexual Reproduction.

Correct option is (A) 5

Correct option is (A) Russia

Internal fertilization: Fertilization which takes place inside the female body is called internal fertilization. Internal fertilization occurs in many animals including humans, cows, dogs and hens.

External fertilization: This type of fertilization in which the fusion of a male and a female gamete takes place outside the body of the female is called external fertilization. It is very common in aquatic animals such as fish, starfish, etc.

(D) Coniferous

Animals which reproduce by budding are:

1. Hydra
2. Sea anemone
3. Corals
4. Sponges
5. Starfish

(B) Ice hockey

Correct option is (A) Eastern

Correct option is (C) Ottawa

Correct option is (B) 5^th

Correct option is (A) Wheat

a) Sexual Reproduction and Asexual Reproduction:

b) Gametes and Zygote:

1. Millions of male gametes (sperms) are produced by the testes. These are microscopic and single celled. Sperm has a head, a middle piece and a tail. Ovary produces female gaffietes called ova. It is a single cell, (haploid) 

2. The fusion of male and female garnet is called fertilization. The result of fertilization is the formation of a zygote. Zygote is a diploid cell. This develops mitorically and forms into an embryo, which further develops into a baby.

c) External fertilization and Internal fertilization:

The process of fertilization that occurs outside of an organism is called External fertilization. 

E.g. Frog, Fish, Star fish, etc. The process of fertilization that takes place inside the body of females is called Internal fertilization. 

E.g. Animals, Human beings.

d) Viviparous and Oviparous animals:

Animals which give birth to their off springs are called Viviparous animals.  

E.g. Animals, human beings. Animals which lay eggs are called Oviparous animals. 

E.g. Hen, duck, pigeon, etc.

Binary fission is an asexual mode of reproduction because it involves production of progeny from one single organism only, and no gametes are formed.

Sexual method: Cats, humans, birds 

Asexual method: Amoeba and Hydra

Difference between asexual and sexual reproduction:

Mammalian gametes are generally of two types......the ovum or egg in females and the sperm in males they are different from each other on account of their chromosome content which is XX in females and XY in male gametes they are involved in sexual reproduction....

The main advantage of sexual reproduction is that it produces various adaptive features in the offspring which helps them to cope up with the environment.