Explore topic-wise InterviewSolutions in Current Affairs.

1. (ii) Inherited trait

2. (i) Acquired trait

3. (i) Acquired trait

4. (ii) Inherited trait

5. (ii) Inherited trait

1. (ii) Homologous

2. (iv) Evolutionary relationship

3. (ii) NO

4. (i) YES

5. (i) Fossil

Yes, Culture an acquired or learnt.

1. (i) Acquired trait

2. (i) Acquired trait

3. (ii) Inherited trait

4. (ii) Inherited trait

5. (ii) Inherited trait

In vitro fertilization technique is used to help those couples in having babies who can produce sperms and ovum but fertilization does not take place inside the woman’s body due to blocked oviducts.

1. Where do test tube babies born? 

2. What differences may we find between normally born baby and a test tube baby? 

3. What problems will test tube babies face in their life? 

4. Why people have so many doubts about test tube babies?

C) In Vitro Fertilization

Metamorphosis in the house fly: A female housefly at a time lays about 120 to 160 eggs. The eggs are laid in garbage, on dung heaps, or on a decaying animal and vegetable matter. 

The life history consists of 

1) egg 

2) larva 

3) pupa and 

4) adult stages. 

Egg: The egg is white and cylindrical on one side. It has two ribbon like longitudinal thickenings. They hatch in about 24 hours into larva. 

Larva: 

The larva is known as a Maggot. It is white in colour. The baby of the larva has 13 segments. It has a mouth and feeds on organic matter. 

Pupa: 

The fully grown larva moves to a dry place in the dung and changes to a pupa. The pupa is dark brown and barrel shaped. In a week, the pupa changes into an adult or imago. Houseflies spread, germs that cause diseases like typhoid, cholera, amoebic dysentery, tuberculosis. Our food should be kept covered from houseflies. The surroundings should be clean without garbage and dung heaps. Insecticides can be used to kill the house flies.

a) Male reproductive system in human beings. 

b) A – Seminal ducts B – Testes C – Penis

c) Sperm cells 

d) This duct connects each testes to the urethra. They transport sperms into the penis.

(C) i, iii and iv

Answer is (D) Stamen

Answer is (C) Uterus

The young one of a cat is called a kitten and the young one of a frog is called a tadpole.

Vegetative reproduction involves single parent and its off springs are genetically identical hence it is considered as a type of asexual reproduction.

The progeny formed from asexual reproduction is the product of single parent and does not have genetic variations.

Reproduction enables the continuity of the species, generation after generation.

Chloroplasts help in the synthesis of food by the process of photosynthesis.

C. scrotal sacs 

Scrotal sac is a part of the human male reproductive system.

No. There are two modes of reproduction in organisms – asexual and sexual. The animals reproducing by sexual reproduction only give birth to young ones. Those reproducing by asexual mode adopt different methods but don’t give birth to young ones directly.

Male reproductive system consists of Testes

B) Binary fission

A zygote is formed by the fusion of the female reproductive cell or ovum and the male reproductive cell or sperm.

Sexual. It brings genetic variation and inherited during reproduction. It helps to create new species.

In Asexual reproduction single individual can able to producing offspring. These offspring are genetically and morphologically similar to one another and also similar to their parent. 

Clone is the term given to organisms that are similar in all aspects. Thus the offspring produced by asexual reproduction are called clones.

A organ is a group of different tissues which work together to perform a specific function in the body of an organism. 

Examples – Organs in the animal body – Brain and kidney Organs in the plant body – Root and leaves.

Yes. Because sexual reproduction brings changes in the genetic structure which leads to variation. This helps the organism to adjust or adapt according to the changes in the environment.

Most of cells are extremely small and cannot seen with naked eye, hence cells could not be observed and studied for thousands of years.

Prokaryotic cell – Blue green algae 

Eukaryotic cell – Onion peel cell

Nerve cell is a long and has thread like branches.

B) Bisexual animal

The basic parts of all the cells are – cell membrane, cytoplasm and nucleus.

The male reproductive system includes a pair of Tests, two seminal ducts and a Penis.

(D) Seminal duct

(a) False 

(b) True 

(c) True 

(d) False 

(e) True 

(f) False 

(g) False 

(h) True 

(i) True 

(j) False

Prokaryotic cell does not have a true nucleus.

Labelled parts : 

1. Fallopian Tube 

2. Ovary 

3. Uterus 

4. Fallopian tube 

5. Releasing ova

Those animals which lay eggs are called oviparous animals. Examples – Hens and frog.

• The term clone is used to describe morphologically and genetically similar individuals. It doesn’t need the production of sex organs.
• In asexual reproduction also only one parent is involved for the production of individual. Newly formed individuals are genetically identical to the parent plant.

A tissue is a group of similar cells performing a specific function. 

Examples – Epithelial tissue, muscle tissue.

egg, caterpiller, pupa, silk moth

(a) Robert Hooke

(b) Cell 

(c) protoplasm 

(d) function 

(e) 0.1; 0.5 

(f) cell 

(g) organs 

(h) organism

(i) tissue 

(j) organ system

A is nucleus ; B is mitochondria; C is cell membrane ; D is cytoplasm; and E is chromosomes.

(a) (i) Eukaryotic cell (ii) Prokaryotic cell 

(b) (i) Amoeba cell (ii) Bacterium cell

Animals which lay eggs are called oviparous animals. 

E.g. 

Hen, Duck, Pigeon etc.

(c) sperm, oviduct, egg, uterus 

Although cells are living structures and bricks are non-living, the arrangement cells is comparable to bricks of building because like buildings made of same bricks have different shapes, sizes and designs, similarly organisms are made up of same cells but are different from each other. 

Organism made of single cell are called unicellular organisms whereas, organisms made up of more than 1 cell are called multicellular organisms.

Correct option  (a) Offspring do not possess exact copies of parental DNA

Explanation:

• In asexual reproduction, a single individual (parent) is capable of producing offspring which are not only identical to one another but are also exact copies of their parent. The term clone is used to describe such morphologically and genetically similar individuals.

• In sexual reproduction because of the fusion of male and female gametes (either by same individual or by different individual of the opposite sex), sexual reproduction results in offspring that are not identical to the parents or amongst themselves.

Correct option (b) i and ii

Explanation:

• Sexual reproduction requires male and female gametes (either by same individual or by different individual of the opposite sex).

• Sexual reproduction generally involves gametic fusion.

• Meiosis occurs during sexual reproduction in dipoloid organisms. 

• External fertilisation is not a rule during sexual reproduction, internal fertilization also takes place

Amoeba is a single cell which behaves like a complete organism.

Correct option  (c) Unicellular organisms

Explanation: 

Many single-celled organisms reproduce by binary fission (e.g., Amoeba, Paramecium), where a cell divides into two halves and each rapidly grows into an adult. In yeast, the division is unequal and small buds are produced that remain attached initially to the parent cell which eventually gets separated and mature into new yeast organism (cells). Budding is also found in Hydra.