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Fill in the blanks with a suitable conjunction.

A wise enemy is better ………... a foolish friend.

Gardeners propagate dahlia and Bryophyllum plants with the help of

How much does your skin weigh?

The narrowest tubes of lungs are termed as:

Question 8 (viii)
Given below is a square of letters in which are hidden different words related to respiration in organisms. These words may be present in any direction – upwards, downwards, or along the diagonals. Find the words for your respiratory system. Clues about those words are given below the square.

(viii) An anaerobic organism

Match Column I and Column II regarding the clotting process:

Malaria is caused by the protozoan ________.

What is the difference between carbohydrate and starch

Why does blood turn dark red while passing in veins through the body?

What role does telomerase play in cancerous cells and how does it control cell death

Name the surgical method of contraception in males.

Which hormone helps in the implantation of the embryo in the uterus?

What does natural selection states?

Explain sexual reproduction. [3 MARKS]

(a) What is meant by reproduction?
(b) What are the two general methods of reproduction in organisms?
(c) How does an Amoeba reproduce? Describe the process of reproduction in Amoeba with the help of labelled diagrams of different stages in its reproduction process.
(d) What is the name of the process by which Amoeba reproduces?
(e) Name two organisms which reproduce by the same asexual process as that of Amoeba.

Agranulocytes are :
(a) lymphocytes and monocytes
(b) lymphocytes and basophils
(c) eosinophils and basophils
(d) dosinophils and monocytes

Which of the following are the functions of the lysosome?

Ribosomes are attached to the surface of___.

Choose the correct sequence of phases in an eukaryotic cell cycle from among the below options.

Which of the following is considered as excretory products in plants?

Which of the following is differently coloured in different people?

The universal source of energy in all cell s?

Name the part of the neuron

a) Where information is acquired.

b) Through which information travels as an electrical impulse.

What is menopause?.

Gustatory receptors detect

Which of these are not accessory glands?

Define parturition.

Mention any two measures to minimise noise pollution.

Fill in the blanks :

(i) Rubber particles and dust raised by running motor vehicles are examples of ............... pollutants.

(ii) Too frequent exposure to ......................... in a medical diagnostic technique may damage chromosomes.

(iii) Thermal power plants give out a lot of ...................... waste water.

(iv) Sewage is a liquid waste from ........................... .

Which device(s) is/are fitted inside the uterus to prevent the implantation of an embryo?

State the three common features of all the respiratory organs like skin, gills and lungs.

Variation in organisms is due to:

Oxygen in lungs ultimately reaches to_______.

What portion of the uterus is shed during menstruation?

The cut part of a plant stem (without roots) which is used in grafting is called:
(a) stock
(b) stump
(c) scion
(d) graft

The presence of radioactive substances in the environment is known as___.

The faulty functioning of an endocrine gland can make a person very short or very tall. This gland is

(a) thyroid

(b) pineal

(c) adrenal

(d) pituitary

Which of the following statements are true ?

(i) sudden action in response to something in the environment is called reflex action

(ii) sensory neurons carry electrical signals from spinal cord to muscles in a reflex action

(iii) motor neurons carry signals from receptors to spinal cord in a reflex action

(iv) the pathway of transmitting signals from a receptor to a muscle is a reflex action

(a) (i) and (ii)

(b) (i) and (iii)

(c) (i) and (iv)

(d) (i) , (ii) and (iii)

Which of the following terms denotes the movement of the root of a plant towards moisture in the soil?

(a) thigmotropism

(b) chemotropism

(c) hydrotropism

(d) geotropism

Which of the following is not a part of the inner ear?

Which of the following comes after gestation?

The ratio of the number of chromosomes in a human zygote and a human sperm is :
(a) 2: 1
(b) 3: 1
(c) 1: 2
(d) 1: 3

The part of the internal ear responsible for hearing is

(a) cochlea (b) semicircular canal (c) utriculus (d) sacculus

Match the following

$$\begin{array}{cc}\text{A. Fight or flight}& \text{1. Pituitary}\\ \text{B. Growth Hormone releasing factor}& \text{2. Thyroid}\\ \text{C. Growth hormone}& \text{3. Adrenaline}\\ \text{D. Iodine}& \text{4. Hypothalamus}\end{array}$$