The lowest level of organization of life is cellular level. The structures that make up a Eukaryotic...

The biosphere consists of extensive network of interconnected ecosystem. An ecosystem is a community...

Nitrogen is never a part of carbohydrates. Nitrogen is essential for plants to synthesize amino acid...

Adolescence results in an individual mental maturity. Reproductive maturity and Emotional maturity. ...

Pituitary gland (of hypothalamus) is a gland located below the hypothalamus in the brain which is du...

After fertilization, a zygote is formed which is combination of sperm with egg. It is the beginning ...

A large number of gametes are released by such animals to ensure better chance of fertilisation. Sin...

Leaves of plants are green because their cells contain chloroplasts which have the pigment chlorophy...

The correct combination of terms w.r.t an animal cell is cell membrane, mitochondria, ribosomes, and...

Soil erosion will be the environment impact of clearing larger patches of forests (deforestation). W...

The process of a bird moving from one place to other due to climatic change is called migration. It ...

Microbe responsible for bread spoilage is fungus. The most common source of microbial spoilage of b...

There is a bacteria named Lactobacillus found in curd. The term is formed by two words Lacto and Bac...

The most beneficial aspect of taking cod liver oil is that it contains high levels of omega - 3 fatt...

Milch animals also called 'Milk yielding animals'. They are domestic animals that yield milk or are ...

Endocrine glands are ductless glands. This means that unlike exocrine glands which pour their secre...

In sexual reproduction, two parents contribute genetic information to produce unique offspring. Sexu...

The unit of measurement used for expressing dimension of a cell is micrometer.

The thyroid gland secretes the hormone called Thyroxine. The amount of the thyroid hormones secreted...

As puberty begins and sex hormone levels rise, differences appear, through some changes are simila...

The aquatic animals in which fertilization occurs in water are oviparous with external fertilizati...

After fertilization, the zygote repeatedly to form a ball of hundreds of cells called an embryo. The...

Genes are unit of inheritance located in the chromosomes. The other statements are incorrect and the...

The Jelly like substance is called the cytoplasm. It contains 80% water. All the organelles (like th...

Red Data Book is the source book which keeps a record of all the endangered animals and plants. Ther...

A wildlife sanctuary is a protected area which is artificially created for the protection of wild an...

Low temperature prevents spoilage of food because it retards microbial growth inactivates enzymes.L...

Malaria is a mosquito-borne infectious disease affecting humans and other animals caused by a paras...

Biofuels are transportation fuels such as ethanol and biodiesel that are made from biomass materials...

A seed drill is a device that sows the seeds for crops by metering out the individual seeds, positio...

Conversion of fertile land into desert.Desertification is a type of land degradation in which a rela...

A disease in human beings caused by virus is influenza. The flu is a contagious respiratory disease ...

Wilt. A wilt disease is any number of diseases that affect the vascular system of plants. Attacks by...

Chromosomes and genes. Genes are unit of inheritance located in the chromosomes. The other statement...

The pair of sex chromosomes seen in human male is XY. In humans, each cell normally contains 23 pai...

Adrenal glands secrete adrenaline. The adrenal glands are endocrine glands that produce a variety of...

Reproduction by budding takes place in hydra. Organisms such as hydra use regenerative cells for re...

It lays eggs from which young ones are hatched later on. The rest three are viviparous. They give bi...

Majority of the cells cannot be seen directly with our naked eyes because they are microscopic. A ce...

Blackbuck,elephant, python and golden at together represent fauna in a forest. The animals of partic...

Endemism is the ecological state of a species being unique to a defined geographic location, such a...

The disease caused by a protozoan and spread by an insect is malaria. Malaria is a mosquito-borne in...

The gas released during the preparation of bread is $CO_2$. In bread making, the yeast organisms exp...

Seeds used for sowing must be disease free. The seed with physical quality should have uniform size,...

The disadvantage of broadcasting is seeds are distributed unevenly. After broadcasting, seed is ofte...

The most conspicuous visible change that is seen in boys during puberty is increase in height. At th...

In humans, the development of fertilized egg takes place in the uterus. Human fertilization is the u...

Unicellular organisms respire and reproduce. Cellular respiration takes place in each and every livi...

Ovaries secrete estrogen. The ovaries maintain the health of the female reproductive system. They se...

For the metamorphosis of tadpoles iodine should be present in the water. This is because metamorphos...