Standard Books Botany Class 12 Questions

The dough kept overnight in warm weather becomes soft and spongy because of

Red data book provides data on

Chargoff's rule states Or Which one of the following ratio is constant in DNAs of different species

Bacteria and fungi in a forest ecosystem are generally

Who is considered as father of genetics

The study of inter-relationship between living organisms and their environment is called

These processes are necessary for the complete development of male gametophyte from pollen mother cell

Ecology takes into account only

The organization which publishes the Red List of species is

______ and _____ were the proportion of plants that were dwarf & tall in F₂ generations of monohybrid cross.

The food chain is a series of the population which starts with producers. It is concerned with

Exine of pollen grains is composed of

Purines of DNA are represented by

One of the oldest food items in which microbes were used is _______

The alleles are

How many meiotic divisions are necessary to produce 100 pollen grains

Watson and Crick are known for their discovery that DNA

A food chain starts with

Many freshwater animals cannot live for long in sea water and vice versa because of the ________

_______ are used in detergent formulations and are helpful in removing oily stains from the laundry

Mass of living matter at a trophic level in an area at any time is called

Large holes in Swiss cheese are due to the bacterium

Nucleotides are building blocks of nucleic acids. Each nucleotide is a composite molecule formed by

The outermost and innermost wall layers of microsporangium in an anther are respectively

In a food web, each successive trophic level has

The bottled juices are clarified by the use of & ________

The 5' end of polynucleotide chain is attached to

Despite occupying about 70 per cent of the surface, the productivity of the oceans are only ________

Most resistant biological material is Or An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is

Curdling of milk takes place by

Pollen grains are generally spherical measuring about ______ micrometers in diameter

The double helical model of the DNA was proposed by Watson and Crick based on what data produced by Wilkins and Franklin

10% law of flow of energy in the ecosystem was proposed by

Energy enters into the ecosystem through

Vitamin B₁₂ is a good source of both curd and yogurt by conversion of milk to curd it increases its nutrient value by increasing the amount of B₁₂.

The function of innermost layer of pollen sac, tapetum is

Which of the following wall layers of anther play a predominant role in its dehiscence

Match the following organisms with the products they produce

A. Lactobacillus

B. Saccharomyces

C. Aspergillus niger

D. Acetobacter aceti

1. Cheese
2. Curd
3. Citric Acid
4. Bread
5. Acetic Acid Select the correct option from the following

Which of the following is an artificial ecosystem

Identify A, B, C and D in given figure

In a food chain, the total amount of living material is depicted by

A compound which is produced by an organism and inhibits the growth of other organism is called

In the DNA molecule

The first link in any food chain is a green plant because

What does the filiform apparatus do at the entrance into ovule Or Function of filiform apparatus is to

Pollen-pistil interaction is a dynamic process involving ______ followed by ______.

_______ is used as an immunosuppressive agent in organ transplants, is produced by the fungus _______

Generally, the food chain has how many trophic levels

DNA consists of two complementary nucleotide chains. If the sequence of nucleotide in one of the chains is AGCTTCGA, then the nucleotide sequence in the other chain shall be

Which of the following is not relevant to the structure of double helical DNA