When seeds are attached to parent plant the type of germination is known as

Chiropterophily means...

The embryo at 16 celled stage is known as

Which one of the following is the most widely accepted method of contraception in India at present?

In a dihydrid cross where two parents differ in two pairs of contrasting traits like seed colour yellow (YY) and seed colour green (yy) with seed shape round (RR) and seed shape wrinkled (rr), the number of green coloured seeds (yy) among sixteen products of F₂ generation will be

The amino acid attaches to the tRNA at its:

Marijuana and charas are

Haploids are more suitable for mutation studies than the diploids. This is because

Which one of these is not used as a bioweapon

A bacterial cell was transformed with a recombinant DNA that was generated using a human gene. However, the transformed cells did not produce the desired protein. Reasons could be:

Silencing of m-RNA has been used in producing transgenic plants resistant to

Animals have the innate ability to escape from predation. Examples for the same are given below. Select the incorrect example.

During the process of ecological succession the changes that take place in communities are:

Green house effect is mainly due to

Extinction of a species in a food chain is compensated by

Name the two layers of seed coat. Where are they formed from?

Difference between Zona pellucida and Corona radiata

What are genetic disorders?

Why is the frequency of red green colour blindness is many times higher in males than in the females?

List two essential roles of ribosomes during translation.

What is homoeostasis?

List Robert Koch's postulates.

Name any two common Indian millet crops. State one characteristic of millets that has been improved as a result of hybrid breeding as to produce high yielding millet crops.

Mention any four diseases that can be treated by antibiotics.

Describe importance of cloning site in a vector. Illustrate with an example.

Name the insect pest that is killed by the product of cry IAc gene.

What is Gause's competitive exclusion principle? Give an example.

Construct a food web from the information below
a) Calms eat plankton
b) Rotifers eat plankton
c) Waterfleas eat plankton
d) Insect larvae eat plankton
e) Insect larvae eat rotifiers
f) Minnows eat insect larvae and waterfleas
g) Tadpoles eat plankton
h) Tadpoles become frogs (use a dotted arrow)
i) Bass eat minnows
j) pike eats minnows, tadpoles, frogs and bass
k) Snapping turtles eat minnows, bass, pike and;frogs 
l) Frogs eat insects which mature from their larvae (another dotted arrow)

How does nature depollutes the air?

Describe chipko movement

The diagram shows the arrangement of blood vessels in the uterus wall and placenta of a pregnant woman.If the women has high blood pressure, would it affect the developing foetus?

(a) A married female, not habitual of using birth control techniques, becomes preganant. The couple does not want to have the child at this time. Which birth control techniques will be most suitable for this female in this situation?
(b) What are the other two reasons in which this technique is adopted?

A tall pea plant with yellow seeds (heterozygous for both the traits) is crossed with dwarf pea plant with green seeds.Using a Punnet square work out the cross to show the phenotypes and genotypes of \({ F }_{ 1 }\) generation.

Show the transcription in eukaryotes with the help of sketches only

Explain the increase in the numbers of melanic (dark-winged) moths in the urban areas of post-industrialisation period in England.

What do these picture 'a' and 'b' illustrate with reference to evolution?Explain.

Trace the life cycle of malarial parasite in the human body,when bitten by an infected female Anopheles.

(i) mention the property that enable sthe explants to regenerate into a new plant.
(ii) A banana herb is virus - infected. Describe the method that will help in obtaining healthy banana plants from this diseased plant.

Name the gobar gas liberated from a biogas plant.Which type of bacteria are responsible for its production? What are the advantages of using it as a source of energy?

Describe briefly Downstream processing.

Name the biological product made in transgenic animal to treat emphysema. Explain the same.

Water is very essential for life.  Write any three features both for plants and animals, which enable them to survive in water-scarce environment.

Given below are two figures depicting pyramid of numbers and pyramid of biomass in aquatic ecosystem and parasitic food chain.Observe the figures carefully and fill in the blanks (a), (b), (c) and (d).

'Determination of Biological Oxygen Demand (BOD) can help in suggesting the quality of a water body'.Explain.

Ornithologies observed a decline in the bird population in the area near a lake after the setting of an industrial unit in the same area.Explain the cause responsible for the decline observed.

Describe the various modes of asexual reproduction in the living organism.

How does the megaspore mother cell develop into a 7-celled, 8-nucleate embryo sac in an angiosperm? Draw a labelled diagram of a mature embryo sac.

Write briefly the changes in the following organs in the different phases of the menstrual cycle...
(a) Ovaries
(b) Uterus
(c) Fallopian tubes.

Explain various special techniques used in assisted reproduction techniques(ART).

(ii) Explain a monohybrid cross, taking seed coat colour as a trait in pisum sativum.  Work out the cross upto F₂ generation.
(ii) State the laws of inheritance that can be derived from such a cross.
(iii) What is the phenotypic ratio in a dihybrid cross?

Discuss the process of translation in detail

A group of pesticide sprayers were about their profession when all the exterminated. How can you explain that such an anxiety was based on ignorance.

Mohan is a second-year student of engineering and Raghu is his best friend and classmate too. But in recent days, Mohan feels Raghu is not behaving the same way with him and has done badly in his assessment tests as well, He suspects Raghu to have taken drugs.
(i)Enumerate the symptoms which mus have made Mohan think so
(ii)List the possible reasons that might have made Raghu take drugs.
(iii)How can Mohan help his friend to give up drugs and come back to normal life?
(iv) What values are promoted by Mohan?

"Modern methods of breeding animals and plants can alleviate the global food shortage". Comment on the statement and give suitable examples.

During recent years many disease resistant crops plants have been released and many chemical pesticides have also been used to control the pest and diseases, so as to improve the agricultural yield. But such methods of pest and disease management have led to the development of 'super pests and super weeds' which require more scientific methods to control them
Answer the following questions on the basis of above information:
(i) Should we continue such a practice of pest and disease management?
(ii) What other method should be adopted to keep the pest and diseases at managable level so as to enhance the agricultural yield?
(iii) What value have not been kept in mind in the above case.

(a) Mention the role of vectors in recombinant DNA technology. Give any two examples. (b) With the help of diagrammatic representation only, show the steps of recombinant DNA technology.

Comment on the growth curve given below.

It was obserbed by a team of research workers the population of fish eating birds is declining gradually year after year after the nearby establishment of a pesticide producing factory a few years ago. Answer the following on the basis of above information.
(i) What may be the possible cause of the declining population of the fish eating birds, in your opinion?
(ii) What may be the alternative to the pesticide.

Write a note on electronic waste. List the various sources of e-waste and the problems associated with its disposal.

Describe the advantages for keeping the ecosystems healthy