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Is there any difference in reflex arc and when brain recieves signals and give order to muscles?

Genetic variations are caused by

Which of the following movements in plants is related to the changes in the auxin level?

What are the openings present on the margins of leaves, especially in places which are humid throughout the year, called?

Enter 1 word only.

Photosynthesis in green plants is directly and indirectly dependent on so many plant structures. Explain briefly the role of the following structures in this process.

(a) Guard cells ................................

(b) Cuticle ....................................

(c) Mesophyll cells ............................

(d) Xylem tissue in the leaf veins ................

(e) Phloem tissue in the leaf veins .............

(f) Stomata........................................

What is the difference between central nervous system and peripheral nervous system?

It has been found that people living in very high mountains have many more red corpuscles in their blood than people living in plains. Which one of the following best accounts for this phenomenon ?
(a) the cold climate stimulates the production of red corpuscles to keep the body warm
(b) people of high mountains breathe more quickly
(c) the low air pressure requires more red corpuscles to supply the body cells with oxygen.
(d) the low air pressure in high mountains speeds up the blood circulation so that more red corpuscles are needed

Is the food vacoule formed hollow?

A man with blue eyes and black hair marries a woman with black eyes and brown hair. A year later they have a child. The child has blue eyes and black hair. If black eyes (B) are dominant over blue eyes (b) and black hair (H) is dominant over brown hair (h), which of the following options correctly predicts the genotype of the child?

The correct sequence of organs in the male reproductive system for the transport of sperms is :
(a) testis $\to$ vas deferens $\to$ urethra
(b) testis $\to$ ureter $\to$ urethra
(c) testis $\to$ urethra $\to$ ureter
(d) testis $\to$ vas deferens $\to$ ureter

Why does menstruation occur? Describe the menstrual cycle in human females (or women).

Unidirectional transmission of a nerve impulse through nerve fibre is due to the fact that:

Which two processes together constitute the M phase of the cell cycle?

(a) How does chemical coordination take place in human beings?

(b) Why is the use of iodised salt advisable?

The growth regulator that retards ageing of plant organs is:

Which is the pituitary hormone that stimulates the activity of testes in males and ovary in females?

What are the two hormones secreted by the thyroid?Mention their function.

What determines the process by which traits and characteristics are inherited?

Match the following:

$$\begin{array}{cc}A& B\\ 1.Hairandmucusinnostrils& a.assistsininhalationandexhalation\\ 2.Cartilageintrachea& b.increasesurfaceareaofabsorption\\ 3.Alveoli& c.preventsentryofforeignbodies\\ 4.Diaphragm& d.preventscollapseoftrachealstructure\end{array}$$

Helicotrema is located at

Why is the large intestine larger in diameter than small intestine?

Most of the endangered species are victims of which of these following factors?

Arrange the following events of the menstrual cycle in correct sequence.
a) release of an egg from the ovary
b) breakdown of the thickened inner wall of the uterus
c) thickening of the wall of the uterus
d) maturation of the ovum

8.'Bile does not contain any enzyme but it is essential for digestion' Explain the statement .

9.(a)Name the substances that get reabsirbed by the tubules .

(b)How are the lungs designed in human beings to maximize the area for the exchange of gases ?

10.(a) What will happen if ...Mucus is not secreted by the gastric glands .

(b) What will happen if ....Leaves of plants are covered with vaseline .

Cell division is required for the following reasons except:

The plant life cycle alternates between a sporophyte and a gametophyte. Usually, in the sporophyte stage

Xylem in plants is responsible for transport of:

To facilitate cloning, a plasmid must have

Cell division is initiated in plants by

Represented below is the inheritance pattern of a certain type of traits in humans, Which one of the following conditions could be an example of this pattern?

Humans are ___. (carnivores/omnivores/herbivores)

Name the asexual method of reproduction in yeast.

In which of the following groups of organisms the food material is broken down outside the body and then absorbed?
(a) Mushroom, Green plants, Amoeba
(b) Yeast, Mushroom, Bread Mould
(c) Paramecium, Amoeba, Cuscuta
(d) Cuscuta, Lice, Tapeworm

What is the name of tiny projections on the inner surface of small Intestine which help in absorbing the digested food ?

Define tissues. 'Tissues exhibit division of labor'. Explain this statement with examples. [5 MARKS]

Blue eye colour in human is recessive to brown eye colour. The expected children of a blue-eyed woman and a brown-eyed man who had a blue-eyed mother is likely to be in the ratio of:

Differentiate between asexual and sexual reproduction. [5 MARKS]

Which layer of the given diagram represent arachnoid layer?

Ripening of fruits in plants is controlled by:

What is ATP molecule?

Are the Uvulla and the epiglottis the same thing? Or do they do the same work? If not, then what are their respective functions!