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Cancerous cells can be destroyed by radiation due to

What is a sarcomere?

What could be the possible explanation for the evolution of four-chambered heart in mammals as opposed to two-chambered heart in fishes?

Write short notes on

(a) AIDS ; (b) Malaria.

Question 17
When we breathe in air, nitrogen also goes inside along with oxygen. What is the fate of this nitrogen?

(a) It moves along with oxygen into the cells
(b) It comes out with the $C{O}_2$ during exhalation
(c) It is absorbed only by the nasal cells
(d) Nitrogen concentration is already more in the cells so it is not at all absorbed.

Which cell organelle is called as 'control center'?

Write down four main characters of Platyhelminthes. Give two examples.

Starch, cellulose, glycogen, chitin are polysaccharides found among the following. Choose the one appropriate and write against each.

Cotton fibre ...................

Exoskeleton of cockroach ..........

Liver ....................

Peeled potato ...................

Try to swallow the saliva in your mouth and feel your neck with your hand. What happens in the neck?

What are the main harmful elements present in mine tailing?

Name the chemical released by cork cells?

till last year we learnt that lysosomes were not present in plant cell but this year in our book its stated that lyssomes are present in plant cell. please clear my confusion?

Humans are __________.

Malathion is used as:

Which of the following statements is incorrect?

Sperm cells are formed by ___ cell division.

The water from the digested food is mainly absorbed by

(a) stomach

(b) duodenum

(c) colon

(d) rectum

Name the locomotory organs in insects.

Why is it usually difficult to demonstrate respiration in green plants?

What percentage of body weight is skin?

Where do you find simple squamous epithelium in an animal body?

As Parenchyma cells are the major storing cells in plants so are ___ tissue as storage one’s in animals.

Nucleoid is a feature of

The epidermis is a layer of__i__ tissue and the dermis is a layer of__ii__ tissue.

The information in which alternative completes the given statement.

Is sedentary existence and active locomotion?

What is the breathing rate in human beings?

Housefly has mouth parts that help in ____________.

Embryogenesis

Assertion: Nitrogenous wastes from blood are removed using a dialyzer unit.
Reason: The blood of the patient and dialyzing liquid are made to flow on two sides of a permeable membrane.

Which of the following source and nutrient is not correctly matched?

In the prothallus of vascular cryptogam, the antherozoids and eggs mature at differenttimes. As a result:

Regarding Assertion [A] and Reason [R], choose the correct option.

Assertion [A] : Muscles can only pull on structures not push.
Reason [R] : Skeletal muscles are often arranged in pairs that pull bones in opposite directions.

________ is produced by first curdling of milk by lactic acid bacteria, and the salting and ripening it with a variety of microorganisms for different flavours.

Name the following :

(a) Multinucleate muscle fibre ;

(b) Spindle shape muscle fibre.

What is exact definition of tissues?

Cell activities are controlled by whom?

Name the different types of simple tissues.

In the five kingdom system of classification, Monera was divided into archaebacteria and eubacteria by:

How are animal living in hot and humid areas adapted to keep their bodies cool

How many pairs of legs does an earthworm have?

__i__is a chronic disease as it affects the body for a__ii__duration of time.

The information in which alternative completes the given statement?

The position of kidneys is

Which one of the following process help to keep the living cell fully rigid?

Which of the following is not a factor responsible for population explosion in India?

Mention two poultry breeds with one example each. [2 MARKS]