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In girls, during puberty the ovaries secrete :

In the absence of light, green leaves turn into ___ colour.

The process by which water particles move from a lower concentration to higher concentration is known as

Yuvraj had a severe injury in his right leg. The doctors told that he had a ligament tear in his right leg. What does the doctor mean?

Boiling point of a compound is raised by _____

Which organisms have ribbon shaped chloroplast??

What is the difference between streptstreptococccus and saccharomyces.

Why Nucleus is responsible for transmission of characters from parents to off Springs?

why are microorganisms classified into parts? (example in fungi or amoeba)

Which organism causes the disease Ebola?

What is metamorphosis? Give two examples of metamorphosis.

Which of these is a food preservative?

How does acid rain occurs? Does it involves carbonic acid?

Name the organs which produce sperms in humans.

Which of the following are secondary sexual characteristics?

Which of the following viruses cause AIDS?

Explain why, the frequency of irrigation of crops is higher in summer season.

What is puberty ? Who attains puberty at an earlier age in human beings : male (boy) or female (girl) ?

What is 'animal husbandry' ?

Out of the following, pick the name of a communicable disease.

Identify the incorrect statement(s) regarding Endocrine system _____.

After consuming a dish of mutton,a person complained of nausea, vomiting, diarrhoea, and pain in the abdomen.

(a) What type of diswase is he suffering from ?

(b) What causes this disease ?

What will happen if the production of adrenaline gland is excess?

The network of tissues and organs that help in getting rid of toxins from the body is ___ .

how does cross breeding helps in improving the varities of crops?

Internal fertilisation occurs:

A. in the female body

B. outside the female body

C. in the male body

D. outside male body

What is the name of the reproductive process :

(a) which involves two parents ?

(b) which involves only one parent ?

In meiosis, the number of chromosomes in each of the four daughter cells is:

1. Same as the parent cell.

   
   

What are silos? What measures are taken to keep silos free from rodent infestation? [5 MARKS]

Fullerene has specific medical utility as well. What is it?

Which isotope of carbon is isobaric with naturally occurring nitrogen element?

What term is used for the first menstrual flow which begins at puberty?

The single nuclear material without nuclear membrane present in the prokaryotic cell is called:

Which of the following is not a rabi crop ?

(a) soyabean (b) peas (c) wheat (d) linseed

(a) How does deforestation cause soil erosion?
(b) Explain how deforestation leads to frequent flooding of rivers.

Mycorrhizal association is obligatory for seed germination in -

RBCs are red in colour because of the presence of

Depending on the shape and structure, epithelial tissue is classified as

Which of the following events are a part of a menstrual cycle?

i. The pituitary gland stimulates the ovaries to produce oestrogen and progesterone

ii. Ovulation takes place

iii. Oestrogen stimulates the uterus to build up extra tissue and blood layer to make the wall nutritious for a zygote

iv. In the absence of fertilisation, the egg is eliminated from the body along with the uterus lining which comes out as blood discharge at the time of menstruation

Which of the following is not a function of lysosome:

All cells in our body maintain a definite shape with the help of:

Why we need a circulatory system?

State one advantage of growing a leguminous crop between two cereal crops.

Difference between mitosis and meiosis.

Alcohol can be converted into vinegar by the action of micro-organisms called:

(a) viruses (b) yeast (c) protozoa (d) bacteria