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Question 20

Why do desert snakes burrow deep into the sand during the day?

Explain what a cell membrane is, with its types.

Two very small organisms X and Y both reproduce by the method of budding. Organism X is industrially very important because it is used in making alcohol from sugar. It is also used in making bread. Organism Y is a tiny animal having tentacles which lives in water.

(a) What is organism X ?

(b) Name the process in which X converts sugar into alcohol.

(c) To which class of organisms does X belong ?

(d) what is organism Y ?

(e) Out of X and Y, which organism is multicellular and which one is unicellular ?

Structures present inside the cell which carry out specific functions are called___________.

Compare the system of classification proposed by Ernst Haeckel and Robert Whittaker. Identify the organisms belonging to the kingdom Protista as per Robert Whittaker's system of classification.

Select a suitable alternative for the blank.

Bruce saw a _____web which was ever growing.

The process of releasing mature ovum from the ovary is called ________ .

Name the endocrine gland which secretes the hormone that maintains correct salt balance in the blood.

What is the role of myelin sheath in nerve impulse transmission?

Read the given statements and select the correct option.

Statement A: A plant or animal species which is exclusively found in a particular area and is not found naturally anywhere else, is known as endemic species.

Statement B: The existence of endemic species is often threatened due to the introduction of exotic species from some other geographical area.

How does deforestation reduce rainfall on the one hand and lead to floods on the other ?

Find out the wrong pair from the following table

If potential (in volts) in a region is expressed as $V(x,y,z)=6xy-y+2yz$, the electric field (in $N/C$) at point $(1,1,0)$is

The frog that feeds on insect is a

What
are developmental tasks? Explain by giving examples.

Which of the following is not a threat to storage of grains?

Explain the technique used in Stethoscope.

The main functions of sympathetic nervous system are _______________________.

For a chromel-constantan (type E) thermocouple, the junction potential E $\left(in\mu V\right)$ at $0^{o}C$ is given by



$E=58.66\theta +4.54\times {10}^{-2}{\theta }^2+2.89\times {10}^{-5}{\theta }^3-3.30\times {10}^{-7}{\theta }^4+\text{higher order terms.}$



Assuming the cold junction compensation. The sensitivity of thermocouple at 100${}^o$C is

Choose the
correct option.

(a) Adolescents
should be careful about what they eat, because

(i) proper diet develops their brains.

(ii) proper diet is needed for the rapid growth taking place in their
body.

(iii) adolescents feel hungry all the time.

(iv) taste buds are well developed in teenagers.

(b)
Reproductive age in women starts when their

(i) menstruation starts.

(ii) breasts start developing.

(iii) body weight increases.

(iv) height increases.

(c) The
right meal for adolescents consists of

(i) chips, noodles, coke.

(ii) chapatti,
dal, vegetables.

(iii) rice,
noodles and burger.

(iv) vegetable
cutlets, chips and lemon drink.

Which of the following is correct about Project Tiger?

Make a comparison and write down ways in which plant cells are different from animal cells.

Fusion of protoplasms between two motile or non-motile gametes called:

Question 04(iv)
Indicate whether the following statements are True (T) or False (F).
A new organism develops from a cell called gamete. ( )

Which of the following organisms can synthesise their own food?

Which of the following cell can change its shape in the human body?

what is gram staining technique?