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Identify Trachea in this diagram

Which of the following does not occur during the Calvin cycle?

Which of the following factors can directly affect health?

Guard cells differ from other epidermal cells in having:

The major reason for extinction of Dinosaurs from the planet is _________.

Saliva in the mouth converts ________ into _________ .

All the following are nucleotides of RNA except

Which part of alimentary canal does not secrete any enzyme but digestion happens?

What are vestigial organs? Name two vestigial organs found in human body

Define chemotropism. Give one example of chemotropism. State whether this example is of positive chemotropism or negative chemotropism.

What is the name of in-built 'arrangement' in our body which controls the timing and amount of hormones released by various endocrine glands in the body?

Blood vessel carrying blood to the walls of the heart.

The envelope of gases surrounding the earth or another planet is called ________.

Over the period of 8 years, the bubonic plague is responsible for reducing the population of the entire Earth by ___ of its size.

Ions diffuse freely along their (i)_____, from the region of (ii)_____ concentration and (iii)_____ charge to the region of (iv)_____ concentration and (v)_____ charge.

A multicellular organism which reproduces by budding is :
(a) Amoeba
(b) Yeast
(c) Leishmania
(d) Hydra

Veins and arteries carry blood. Which of these carry blood :
(a) away from the heart ?
(b) back to the heart ?

(a) Name the various organs of the human excretory system.
(b) Draw a neat labeled diagram of the human excretory system.
(c) What is the function of the excretory system in humans?

In the back of the tongue which sense of taste is recognized?

(a) A person cannot read newspaper placed nearer than 50 cm from his eyes. Name the defect of vision he is suffering from. Draw a ray diagram to illustrate this defect. List its two possible causes. Draw a ray diagram to show how this defect may be corrected using a lens of appropriate focal length.

(b) We see advertisements for eye donation on television or in newspapers. Write the importance of such advertisements.

In internal fertilisation, there is always ________.

In a hydroelectric power plant, moving water is used for driving the wheels of a turbine to generate electricity. If the change in kinetic energy of turbine is 1200 J in 2 minutes then the power generated is

DIRECTIONS: Match Column I with Column II and select the correct answer using the codes given below the columns.

$\begin{array}{cc}Column-I\left(Diseases\right)& Colum-II\left(Cause\right)\\ A.SmallPox& P.Bacteria\\ B.Cholera& Q.Virus\\ C.Malaria& R.Deficiencyofminerals\\ D.Anaemia& S.Femalemosquito\end{array}$

Who was the first person to describe the pathway of blood through veins and arteries?

A clean ___ face made the resemblance more pronounced than it would otherwise have been.

What is mean by natural selection?

The __ checks the entry of food into the respiratory tract.

Given below is a highly schematic diagram of the human blood circulatory system.
(a) Which part (state the number) represents the hearts? Give reason ink support of your answer.
(b) Which numbers represent the following respectively?
Aorta Renal vein
Hepatic portal vein Stomach
Pulmonary artery Dorsal aorta
Superior vena cava

Name and define the process responsible for ascent of sap

Differentiate between endocrine and nervous system

Which one of the following is the natural fruit ripening hormone?

Anaerobic respiration in the muscles produces:

The placenta is in the centre in which of these plants?

The materials transported during organic translocation by phloem is/are ___ .

Adult human RBCs are enucleated. Which of the following statement(s) is/are the most appropriate explanation for this feature?
(a) They do not need to reproduce.
(b) They are somatic cells.
(c) They do not metabolise.
(d) They have a high surface area to volume ratio for more oxygen to be transported.

What is the correct labelling for this part?

The space between the cornea and the lens of the eye is called ________ .

Mucus production in nose is advantageous because it ____.

First vaccine was produced by

Ram is suffering from Beri-Beri. This is due to the lack of____ in his diet.

What is relfex arc?Explain does it need brain in action or not

Explain excretion in plants with full details

Why does our heart stops for a while when we sneeze ?