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Decibel is a standard abbreviation used for the quantitative expression of

The loss of my arm ____ as great a handicap as you might have expected

During the breathing cycle, when air is taken in and let out:

Which of the follow is not a characterictic of plastids?

A very large fraction of people defecates in the open, on dry riverbeds,on railway tracks.How does this situation affects us? [5 MARKS]

Which chamber of heart has the thickest wall?

Production of a replica of any cell or organ or entire organism is called

Which of the following methods are used to measure transpiration?

The movement of material in a cell against concentration gradient is called as

Which one of the following is a case of wrong matching?

(a) What changes are seen in girls at the time of puberty?
(b) Name the organs which produce ova (or egg cells) in human females.
(c) Draw a labelled diagram of the human female reproductive system. With the help of this diagram, explain the working of the human female reproductive system.
(d) Describe the process of fertilisation in humans and the development of the embryo briefly.

Lion: Den :: Rabbit : ?

Where does the cyst formation take place during multiple fission?

The diffusion of ${CO}_2$ across the alveolar membrane is 20 times faster than that of $O_2$ because

Multiple fission occurs in

Study the diagram given below and answer the questions that follow:

(a) Name the process being studied in the above experiment.

(b) Explain the process mentioned in (a) above.

(c) Why is oil placed over water?

(d) What do we observe with regard to the level of water when this set up is placed in (1) bright sunlight (2) humid conditions (3) windy day?

(e) Mention any three adaptions found in plants to foster the process mentioned in (a) above.

What is the angle of the sector in the pie diagram showing the expenditure incurred on paying a royalty?

The following pie diagram shows the expenditure incurred on the preparation of a book by the publisher for various reasons:

A. Paper $20\%$

B. Printing $25\%$

C. Binding Designing $30\%$

D. Royalty $15\%$ or

E. Miscellaneous $10\%$

Two potted green plants of the same kind were taken to perform an experiment. One of them was kept in a dark room, while the other one was kept in sunlight for 3–4 days. A leaf from each of the plant was taken to perform the iodine test. Which of the leaves turned blue-black in colour and why? [5 MARKS]

(a) Leaves of a healthy potted plant were coated with Vaseline. Will this plant remain healthy for long ? Give the reason for your answer.
(b) What will happen to the rate of photosynthesis in a plant under the following circumstances?
(i) cloudy day in the morning but bright sunshine in the afternoon
(ii) no rainfall in the area for a considerable time. (iii) gathering of dust on the leaves

Diploid state and haploid state of the cell can be represented by ………………….. and ………... respectively

According to fossil discovered up to present time, the origin and evolution of man started from _______ .

A nutritive fluid filled inside the cavities called ventricles is known as

Match the following neurons with their criteria.
$\begin{array}{cc}\text{Column I}& \text{Column II}\\ \text{i. Multipolar}& \text{a. One axon and One dendrite}\\ \text{ii. Bipolar}& \text{b. One axon and Several dendrites}\\ \text{iii. Unipolar}& \text{c. One cell process that splits into two axons}\\ \text{iv. Pseudo Unipola}r& \text{d. Cell body with One axon only}\end{array}$

Fill in the correct sequence for generation of Action potential in a neuron

Stimulus ⟶Inflow of $N{a}^{+}$ ions ⟶ _(i)_____⟶Repolarisation ⟶___(ii)______

Nutrients and oxygen to the tissues of the brain are provided by ____________ .

Neurons are classified into sensory neurons and motor neurons based on ________ .

Which of the following statements is correct with respect to kidney function?

Which one of the following organisms is correctly matched with its particular named taxonomic category?

In the human ear, which bone is connected with the tympanum?

State whether coughing is a voluntary action or reflex action.

Guttation is:

Oral vaccine prevents the attack of ________.

When we migrate from dark to light, we fail to see for sometime but after a time visibility becomes normal. It is example of _____.

The condition resulting from the loss of skin pigmentation in patches from various parts of the body is called:

An organism which can reproduce by two asexual reproduction methods one similar to the reproduction in yeast and the other similar to the reproduction in Planaria is :
(a) Spirogyra
(b) Bryophyllum
(c) Hydra
(d) Sea anemone

(a) Write the names of the regions in the hindbrain. Give one function of each region.

(b) Name the functions of the cerebrum.

Question 40
If a plant is releasing carbon dioxide and taking in oxygen during the day, does it mean that there is no photosynthesis occurring? Justify your answer.

Which factor has not been cited as one of the factors causing the collapse of Maya society?

What is the role of lymph in our body?

If a cell needs to quit dividing, it enters a state where it stagnates to carry its normal cell activity. This is called as the _____ phase.