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What is a fertiliser ? Name any two fertilisers. State two harmful effects caused by the excessive use of fertilisers.

A sal tree takes almost ________ years for full maturation.

Tuberculosis of the lungs makes us ill over the years, resulting in weight loss and continuous tiredness. Hence, tuberculosis is a ________ disease.

Q52. . A frog has been named after wildlife scientist Mewa Singh, in honour of his contributions to behavioural ecology and primate studies. The frog is endemic to the region of:

Land conservation causes and solutions in 50 to 60 words.(5 marks)

Which of the following plants need addition of manures and fertilizers?

Food chains generally consist of only three or four steps because:

The Calvin cycle leads to reduction of

Name the type of vegetative propagation in which parts of two different plants are used.

What is cell theory?

Which of the following is NOT a medicinal plant which can be grown as an intercrop in fields?

Elements which are needed by the plants in fairly large amounts are called ___ .

Which of the following is a plant cell?

Pick the major sources of irrigation from the list below.

Characterstics that are transmitted from parents to offsprings during sexual reproduction show :

(a) only similarities with parents

(b) only variations with parents

(c) both similarities and variations with parents

(d) neither similarities nor variations with parents

Average human adult contains ______ litre of blood.

How does change in maturity duration benefit the farmer?

At what age does puberty begin in females?

The testes are placed outside the body because:

Which of these is a plant that reproduces from its leaves?

What is staphylococcus?

What is a 'combine' which is used in agriculture ? State its functions.

Seeds are formed by the maturation of the

Match the given organisms to their species:

$\begin{array}{cc}\text{ORGANISMS}& \text{SPECIES}\\ \text{1) Human beings}& \left(i\right)familiaris\\ \text{2) Pea plants}& \left(ii\right)sapiens\\ \text{3) Dogs}& \left(iii\right)sativum\end{array}$

Select the major sources of irrigation from the list below.

Which type of immunity varies from person to person?

Reason for why we find it difficult to prepare antiviral drug

Which hormone initiates the ovulation of follicles on ovaries?

Which one of these tissues is responsible for the growth processes in plants?

Bacteria plays important role in an ecosystem because

Difference between vaccination and immunisation

Which of the following statements are true about microbes?

why there is a need of variety of animals and plants in a forest.

In plants, ascent of sap takes place through

Give the brief explanation of all the hormones in males and females respectively with their diagram.

Solid pollutants do not include:

Deficiency of iodine in our diet leads to a condition called:

Weeds do not compete with crop plants for which of the following?

Assertion : Water molecules are attracted to one another more than the water molecules in the gaseous state.

Reason : It produces surface tension that accounts for high capillarity through tracheids and vessels.

Survival of plants in terrestrial environments has been made possible by the presence of