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difference between selective and non selective herbicide

Do you think the microorganisms in the large intestine have any other role other than producing odour in the faeces ? If yes, then what role do they have?

What is the difference between threshing and winnowing

The first antibiotic called penicillin was extracted from :

(a) a bacterium (b) a protozoan (c) a fungus (d) an alga

_______ is the branch of agriculture dealing with feeding, caring and shelter of domestic animals, reared at home or in farms.

Q19. Consider the following statements:

1. Silent Valley is located in Tamil Nadu.

2. Silent Valley is home to the largest population of lion-tailed macaques.

Which of the statements are correct?

Plasmodium falciparum is a unicellular parasite which causes malignant malaria in human beings. It has a prominent nucleus. Based on the given information, predict the group to which this parasite belongs.

Why do some seeds have wings?

The micro-organisums which can reproduce and multiply only inside the cells of other organisms are :

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

Which of the following is produced by the testis?

What are semi-autonomous cells?

Match the following
$\begin{array}{cccc}A.& \text{Zoophily}& 1.& \text{Pollination by birds}\\ B.& \text{Ornithophily}& 2.& \text{Pollination by insects}\\ C.& \text{Entomophily}& 3.& \text{Pollination by bats}\\ D.& \text{Chiropterophily}& 4.& \text{Pollination by animals}\end{array}$

Identify the vegetative parts of a plant.

Please explain this statement. Cochineal insect is used to eliminate opuntia.

Draw a neat, labelled diagram of nitrogen cylcle in nature. Which natural phenomenon occurring in the sky is responsible for nitrogen fixation ?

The process by which plants produce complex organic compounds from simple substances like light, water, and carbon dioxide is called __.

Largest organelles in cell are:

Pollination is an example of which of the following types of interactions?

What will happen if we kill all the organisms in one tropic level? [2 MARKS]

Which component of blood helps in the transport of oxygen?

How are forest-fires and drought the natural cause of deforestation? [3 MARKS]

Which of the two has a shorter reproductive phase of life: men or women?

Explain the process of desalination by reverse osmosis? [3 MARKS]

Which of the following methods can be used to overcome the space constraint and unavailability of fertile soil for growing plants?

What is internal fertilization? Identify A, B, C ,D and E. [3 MARKS]

The pyramid of numbers is spindle shaped in case of ____.

Among the following species octahedral shape is found in:

The conversion of nitrates to ___ gas by bacteria is called nitrification.

What type of fertilisation takes place in the following?

(a) Cow

(b) Frog

(c) Humans

(d) Fish

(e) Hen

Which four kingdoms consist of eukaryotic organisms in the six-kingdom classification?

One complete contraction and relaxation of the heart is called

Amoeba is reproduced by

Question 2 (b)
Differentiate between Zoo and wildlife sanctuary.

Eutrophication is:

What is the term used for disease or syndrome caused by deficiency of vitamins?

Which of the following is a breed of cow?

_____ pairs of cranial nerves and ______ pairs of spinal nerves are present in the human body.

Which of the following properties differentiate fertilisers and manure?

Which of these following statement is the correct meaning of the term 'global warming'?

In this chapter it is explained that cancer happens when cells go out of control so, at that time why can't the bacteria stop growth of cells. Explain

Male gonads in humans are called

Which of the following organisms do not play a role in increasing soil fertility?

Chart:how gland secrets hormone with its name and the hormone released by it.The hormone use.In both Girls and boys.

Which extra hormone is secreted during pregnancy?