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What is exudates?

how HCl activates pepsinogen?

Which of the following kind of life cycle is found in bryophytes?

Which of the following statements supports Darwin's belief about the origin of all species?

X and Y are two human beings. The organ A in the reproductive system of X releases a mature gamete B once a month which goes into a tube-like structure C through a funnel-like opening. The organ D in the reproductive system of Y makes and releases gametes E which pass through a duct F and are introduced by an organ of Y, into the body of X. B and E fuse together in C to form a new cell G. The cell G divides repeatedly to form a ball of cells H which gets embedded in the lining of organ I of reproductive system of X where it grows and develops into a baby.
(a) Name (i) organ A, and (ii) gamete B.
(b) Write two names of tube-like structure C.
(c) Name (i) organ D, and (ii) gamete E.
(d) Write two names of duct F.
(e) Name (i) cell G (ii) ball of cells H, and (iii) organ.
(f) Out of X and Y, which one is (i) male, and (ii) female?

Which of the following is caused due to excessive use of cell phones?

Guard cells help in

In which group of animals, coelom is filled with blood?

what is the difference between afferent and efferent neurons ?

Match List I and List II and select the correct answer using the codes given below the lists

One of the following organisms does not reproduce by binary fission. This is :
(a) Amoeba
(b) Plasmodium
(c) Leishmania
(d) Paramecium

Which of these statements is/are TRUE about antibiotics?

Which of these is a part of stamen?

Regarding the assertion and reason, choose the correct option.

Assertion [A]: A genetic disease that affects only one parent can have 50% chance of affecting the child.
Reason [R]: An autosomal dominant defective allele can cause a disease even in heterozygous condition.

The stage of development at which implantation occurs in human female is

Earth is protected from ultraviolet radiations by

Estrogen and progesterone are secreted by ___

Arrange the following evolutionary stages of human species in correct chronology.

1. Homo-Habitus 2. Australopithecus

3. Homo-erectus

Select the correct code:

सही कालक्रम में मानव प्रजाति के निम्नलिखित विकासवादी चरणों को व्यवस्थित करें:

1. होमो-हैबिटस 2. आस्ट्रेलोपिथेकस

3. होमो-इरेक्टस

सही कूट का चयन करें:

Differentiate between ureter and urethra. [2 MARKS]

Which of these following diseases can be classified as a viral disease?

why does respiration is called exothermic reaction?

The figure given below shows diagrammatic cross-sections of three kinds of blood vessels.

(a) Identify the blood vessels A, B and C.
(b) Name the parts labelled 1-4.
(c) Mention two structural differences between A and B.
(d) Name the kinds of blood that flow through A and through B respectively.
(e) In which one of the above vessels referred to in (a) above does the exchange of gases actually take place?

Constrictions at intervals in a nerve fibre are known as

Which plant hormone helps in breaking seed dormancy?

Which of the following shows the correct order of increasing bond dissociation energies?

The growth movement of a plant part in response to the touch of an object is called :

(a) thigmonasty

(b) hydrotropism

(c) thigmotropism

(d) geotropism

With the help of an experiment, prove that roots are more positively hydrotropic than geotropic.

Given below is a diagram representing a stage during mitotic cell division. Study it carefully and answer the questions that follow :
(a) Is it a plant cell or an animal cell? Give a reason to support your answer.
(b) Identify the stage shown.
(c) Name the stage that follows the one shown here. How is that stage identified?
(d) How will you differentiate between mitosis and meiosis on the basis of the chromosome number in the daughter cells?
(e) Draw a duplicated chromosome and label its parts.

What is the difference between acids and bases with chemical reactions

during breathing cycle what is the advantage of residue volume of air in lungs ? explain

Water vapor exits and $C{O}_2$ enters a leaf through the

What exactly the catalysts do?

Mark the odd one out:

Are anyother fish (other than dolphins) echolocators, considering that a large number of them live deep underwater, where light does not reach?

Which of the following is not present in urine?

How is ATP produced in human cells ?

Meaning and work of auxin

Fill in the blank the correct degree of comparison.

These loaves of bread are the ________ ones of the lot.

Write two examples each of sexually transmitted diseases caused by (i) virus, (ii) bacteria. Explain how the transmission of such diseases be prevented?

Why is limewater used in the experiment to prove that CO2 is produced during respiration in germinating seeds?

In this experiment, how does KOH affect the process of photosynthesis in the plant kept in bell jar ?